New Cartridge/Pistol Idea -- "6.8mm Kel-Tec"

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One other thing to keep in mind is that the new cartridge will need to be designed so that it can't accidentally be chambered in any firearms which can't withstand its pressure. This means that simply running the pressure up on the .32ACP to get the performance desired is going to be problematic from that perspective--if not from any others. This is a fairly important consideration given that it's going to need to run higher pressure than the .32ACP or .380ACP to have a chance of performing well enough to supplant either one.
.32 Super makes good sense.
I have my doubts. One thing I AM sure of is that if the .32 Super were somehow incontrovertibly proven to be completely infeasible and, as a result, went the way of the 6.8KT, there would very quickly be another proposed pocket handgun cartridge that would "make good sense". :D
 
One other thing to keep in mind is that the new cartridge will need to be designed so that it can't accidentally be chambered in any firearms which can't withstand its pressure. This means that simply running the pressure up on the .32ACP to get the performance desired is going to be problematic from that perspective--if not from any others. This is a fairly important consideration given that it's going to need to run higher pressure than the .32ACP or .380ACP to have a chance of performing well enough to supplant either one.I have my doubts. One thing I AM sure of is that if the .32 Super were somehow proven to be infeasible and went the way of the 6.8KT, there would very quickly be another vaporware pocket handgun cartridge that would "make good sense". :D

It would be substantially longer than .32ACP, so no problem there.
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The only thing that bugs me is I wanted to go with .32x21mm or .32x22mm -- for the increased case capacity (whether for performance or to keep pressures down). But, I also wanted to keep it no longer than a 9x19mm.
As you can see above, the .32 Longue (actually 7.65mm) x20mm is already longer than a 9x19mm (though the wikipedia specs have it shorter ~ overall length).
That issue could be worked out, one way or another.

But no, I only have this one good idea as far as this goes -- simply to make a thinner cartridge for a higher capacity in a pocket pistol, that's more potent than .32ACP.
6.8mm was proven too thin, and .32" is the only sensible next-larger-increment -- especially with abundance of other .32 stuff...
Any higher and you're at ~.357, and the point becomes moot.

I'm basically sold on this concept. So my work is done. Now it's time for others to make it reality.
 
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It would be substantially longer than .32ACP, so no problem there.
If you can make the cartridge "substantially longer" than the .32ACP while matching or exceeding .380ACP performance and while keeping the overall gun the same size and weight (or smaller and lighter) than a .380ACP (keeping in mind that the .32ACP and .380ACP are identical in length) then you might have something that would appeal to some buyers. They could basically buy what amounts to a .380ACP pistol that gives them 1 or 2 more rounds (depending on whether the design is a single or double stack) without a size/weight/performance/shootability penalty.

Assuming all that is possible, I don't know if that benefit would be enough to prompt a significant number of people to part with their money given all the issues with new guns and calibers. There are lots of amazingly good ideas that offered the consumer much more than this one that have still died on the vine.
I'm basically sold on this concept. So my work is done. Now it's time for others to make it reality.
Wow, it's really spooky when you channel John Browning like that... :D
 
If you can make the cartridge "substantially longer" than the .32ACP while matching or exceeding .380ACP performance and while keeping the overall gun the same size and weight (or smaller and lighter) than a .380ACP (keeping in mind that the .32ACP and .380ACP are identical in length) then you might have something that would appeal to some buyers. They could basically buy what amounts to a .380ACP pistol that gives them 1 or 2 more rounds (depending on whether the design is a single or double stack) without a size/weight/performance/shootability penalty.

Assuming all that is possible, I don't know if that benefit would be enough to prompt a significant number of people to part with their money given all the issues with new guns and calibers. There are lots of amazingly good ideas that offered the consumer much more than this one that have still died on the vine. Wow, it's really spooky when you channel John Browning like that... :D

My guess, after input from others, is that the barrel would have to be a bit longer -- thinner cartridge would need more time, and more barrel length, for the pressure to push the projectile past the velocities of .380...
So figure, what, an extra half inch on the barrel. More? I don't know... Otherwise yeah, same size as a P32/P3AT.
I'd possibly be in favor of squeezing in one extra additonal round into the grip/mag - to sweeten the pot and allow for a slightly better purchase on the grip. So then we'd be at 8+1 to the P3AT/LCP's 6+1.

Edit: Forgot to add how the few extra millimeters on the chamber would affect overall length. That's still fairly negligible though.
 
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I'd possibly be in favor of squeezing in one extra additonal round into the grip/mag - to sweeten the pot and allow for a slightly better purchase on the grip. So then we'd be at 8+1 to the P3AT/LCP's 6+1.
Assuming a perfect single-stack, 8 rounds of this proposed cartridge would be 2.672" long. 7 rounds of .380ACP is actually a little bit shorter than that at only 2.618". You said earlier that it would be unacceptable to just increase the grip length of a .380ACP pistol to hold one more round as an alternative to coming up with an entirely new cartridge and gun. But going to an 8+1 in this new cartridge would make a longer grip than just lengthening a .380ACP mag to accommodate an extra round.

I know you can do simple math and that means you posted without taking the time to do even the most basic "sanity check". It's hard to take you seriously when on the one hand you keep telling us how great the idea is and how you're so sold on the concept but at the same time you aren't taking your own idea seriously enough to spend a minute or two with a calculator to see if what you're saying makes sense.
 
Wow, it's really spooky when you channel John Browning like that... :D
Obviously Browning enjoyed machining and tinkering and building and whatnot. Clearly he had an extremely high mechanical IQ & spatial intelligence. He could probably visualize the action in his head.
I don't really have the "Swiss Watchmaker" type DNA.
Honestly, I'm too lazy for all that. I can fix things when they're broken, when I have to -- cars, household appliances, light electronics/computer repair, plumbing ... etc.
I just don't enjoy that kind of thing, you know, work.
I'm actually a good worker though, when I get moving. Very concientious. Thorough. Good attention to detail. Almost a perfectionist even.
I just have a motivational problem. Sloth -- I have sloth.

But see, now that we have this great concept laid out before us... now all we need is a modern-day John Browning. Maybe he's reading this forum right now. He could take this idea and run with it. Another guy might be a reloading ace, and he sends his perfected cartridges to this Neo-Browning guy.

Teamwork.
 
Assuming a perfect single-stack, 8 rounds of this proposed cartridge would be 2.672" long. 7 rounds of .380ACP is actually a little bit shorter than that at only 2.618". You said earlier that it would be unacceptable to just increase the grip length of a .380ACP pistol to hold one more round as an alternative to coming up with an entirely new cartridge and gun. But going to an 8+1 in this new cartridge would make a longer grip than just lengthening a .380ACP mag to accommodate an extra round.

I know you can do simple math and that means you posted without taking the time to do even the most basic "sanity check". It's hard to take you seriously when on the one hand you keep telling us how great the idea is and how you're so sold on the concept but at the same time you aren't taking your own idea seriously enough to spend a minute or two with a calculator to see if what you're saying makes sense.

I'm not following.

Earlier I did say, "Let's keep the grip the same length", which means just allowing for one more additional capacity compared to .380 in the same length of grip.
But I softened up my stance on that. If adding 4/10" to the magazine/grip allows for another +1... Eh, maybe that would be worth it and not hinder it going into a pocket too much.

I'm just basing my math on the fact that a P32 holds 7+1, while an equivalent grip length in the .380 is 6+1...so keeping the grip the same length would be 7+1 in this cartridge.
I figure maybe we could squeeze another round in there for a slightly longer grip, giving us 8+1.
 
Here's a P32 (7+1) next to a P380 (6+1) ... roughly same grip length - top to bottom.

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I figure maybe we could squeeze another round in there for a slightly longer grip, giving us 8+1.
That would result in a grip that is longer than a 7+1 .380ACP, all else being equal.

Originally, the idea of the .32Super was to get another round of .380ACP equivalent ammo into a single stack pocket pistol. Earlier I asked why we just didn't length the grip of a .380ACP pistol which would solve the problem without the need for designing an entirely new cartridge and gun. You said that wasn't acceptable because grip length was an important factor in a pocket pistol.

But now it appears that it is acceptable to lengthen the grip. And not just as long as it would take to get a .380ACP up to 7 rounds--my proposed solution--but even slightly longer than that.

<Edited to fix a math error.>
 
Well, I guess the bottom line is that .32 diameter allows for +1 on the .380 for every 9 rounds in a single stack, given the ratio of 10 rounds .32 = 9 rounds. 380... or 11% higher capacity for a given length.
It's about the same difference between 9mm and .40... and people do mention 'the greater capacity' of 9mm as a selling point when comparing the two. So it's not entirely insignificant.
 
If the OAL of this "32 Super" is longer than 380 and no longer than 9x19, a few quick points. One, if you are close to 9x19 length, then you're on the same frame size as the 9mm, which anyone would choose over a .32. If it had to be .32 at that point, why not neck down a 9mm to .32, much easier to deal with a 9mm wildcat than making an entirely new cartridge. It wouldn't be successful but it would be a simple barrel swap instead of a new gun.

But if it's meant for really small guns like the P3AT or LCP, you'd probably be better off just necking down the 380, which I believe is .32 NAA. Because the 32 case is thinner than the 380 case, and if you want a big bump up in power while keeping it a straight wall cartridge, for it to hold as much powder as a 380, it's going to have to be longer, how much more I don't exactly know but longer isn't helping the P3AT/LCP platform. That's why necking down is going to be a better option, and since the .32 NAA already exists, the only real way to gain anything over it would be to make it higher pressure, and from what I can gather, the .32 NAA while based off the 380 ACP is higher pressure than the 380 ACP already.

I suppose you could take a 9mm case, cut it down slightly, then neck it down to .32 that way you could take advantage of the 9mm's higher pressure, but you will need to make certain what platform you want to use, is it 9mm sized like G43 or P365? Or is it more in line with the P3AT/LCP? But overall here's my issue, nobody is going to choose a .32 over a 9mm and the vast majority choose 380 ACP over 32 ACP. Either way it's still a quite anemic cartridge in comparison, so it's not like it's offering anything doesn't already exist.

Another point, look at available .32 projectiles. You would need stronger .32 bullets to hold up to extra velocity and still penetrate. If you simply take a .32 ACP designed bullet and drive it faster, the results aren't better. Yeah you get more "energy" but penetration is going to be bad, and for effectiveness you need something that's going to penetrate and expand.
 
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Nevertheless, people do frequently choose lesser calibers than 9mm for the smaller gun that comfortably fits in a pocket.
This round, as a pocket gun or back-up, is meant to compete with those lesser calibers: .25ACP, .32ACP, .380ACP.

We all understand that you MEANT for it to compete with the mouse guns. But it has to be too big, putting it firmly in competition with 9mm pistols, not with the 25/32/380 frames.

If people wanted a 9mm sized, but weakling of a pistol, the Bersa Thunder, Walther PPK, and Ruger LC380 would be running their weight class. But they aren’t - they’re an embarrassing footnote not even getting honorable mention among 9mm pistols in their size class.

I'd only counter that, up until recently... with modern pistol designs, powders and metallurgy... what wasn't achievable with those cartridges then very well could be now.

This has been well considered by the professionals who do this type of work EVERY SINGLE DAY. Modern case design and powders have been around for generations, it’s not new. But the modern consumer has realized the pitiful performance of the 25acp and 32acp just isn’t worth the size, both for lacking stopping power, but also for excessive recoil if the power is increased in the mouse gun size class.

Equally, you can’t fight engineering and materials realities - you can’t make a high pressure, high powered pocket pistol. The mechanical integrity of the LCP sized pistols just can’t contain the power of anything more than a 380. But to achieve your goals - your cartridge is much longer and must run higher pressure than 380, again, meaning it’s going to at LEAST be in a 9mm sized gun, at the chamber and recoil assembly, but with a smaller bore, demanding a longer barrel to get to the same performance of the 380. Those old 25 and 32 designs were small because they could be. The inherent case design to these small bores meant they are weak - which I’ve belabored here - so the pistols could be built small. The more powerful you make it, the bigger it has to get, because steel can only hold what steel can hold. Higher tensile alloys are available, but now you’re talking about a pistol costing $1000-1500 in a market tolerance of $250-500.

With concealed carry coming onto the scene strong in the last decade, and with it a tremendous new demand for pocket guns...

And we’ve addressed this as well - the day of the mouse gun has largely passed. When you consider any market and “trend trending,” you have emergence, eruption, and evolution. A good idea peeks it’s head out from the weeds, and if it’s strong enough to survive, it runs. Typically there’s a stagnation period between eruption and evolution - the evolution is forced by the stagnation to sustain the trend. The market trends will change in time, following these patterns. Your idea is in opposition to the existing market trend, even in its emergence phase, let alone now in its new evolution.

When we started the concealed carry boom 15yrs ago, the only small guns on the market became very popular, very quickly - except the market already recognized they didn’t want anything weaker than 380acp. There was a small bump in sales for the existing 32acp models, just as you would expect for any competing product in a major market trend - the products were there and they were inexpensive, so they sold. There were no new 32 or 25 models introduced, there weren’t any new smaller caliber cartridges developed. Just some sales surge for a near-obsolete product line. Then starting 6-8yrs ago, we hit our first evolution for the concealed carry market.early into the concealed carry market life cycle, we hit our first evolution as the trend cycled away micro 380’s to larger, more powerful pistols. Concealed carrying citizens realized they wanted more grip, longer sight radius, and more power. We didn’t see a resurgence for the mid-sized, compact 380’s like the LC380 (largely a swing and a miss by Ruger) or Bersa Thunder/walther PPK/s. We saw a lot of pocket 9’s coming out to meet that desire. Officer 9mm’s started coming out all over, Glock brought out the 43, Sig 938’s started outselling 238’s. Today, we’re living in the age of the single stack 9mm for concealed carry, and the trend is working tighter and tighter toward that every year. Your design didn’t have a place in the market even in 2005 when the pocket 380’s were all the rage, because it would be larger, more expensive, and have less stopping power, and now when larger guns are more popular, your lack of power isn’t compensated by a few rounds in the magazine.

Equally, most of the concealed carry market (saying this in my 11th year as a concealed carry instructor) has gone away from pocket carry, and that portion of the market was always a minority. Largely moot, as compact size and light weight is important even in a bolstered concealed carry piece, but the concealability difference between a single stack “micro 9” and a 380 mouse gun is wholly moot. The market trend in holsters and pistol models has proven this. In the early days of the concealed carry revolution, there was a lot of pocket carry as guys started shoving guns they already had into their pockets (seems like EVERYONE had a S&W 60 back then, for no reason), then realizing they wanted something smaller and lighter... nobody really liked the idea of stepping down in power to a 380, but that’s what was available. The market demanded lighter weight, single stack 9mm’s, so the industry delivered them, and the market demanded good quality, low cost holsters, and the industry delivered that too.

The days of guys running around with “a 32 gun in his pocket for fun” are long over.

So it’s not an issue of modern materials and components. It’s a matter of fitting 10lbs into a 5lb sack, and then living in a market where nobody really wants 5lb sacks any more anyway.
 
I'm basically sold on this concept. So my work is done. Now it's time for others to make it reality.
The gist of the entire thread. I want it, I don't care that no one else does, I don't care that the research costs will never be recovered by any company that adopts it, I don't care that there are better alternatives. I want it, I can't get it on my own, someone else do all the work. Sorry, but that is all I have been able to pick up. Rant over.
 
So figure, what, an extra half inch on the barrel. More? I don't know...

For a 32 caliber bore to match the volume of a .380, it’s a lot more than a half inch. The relative bore volume per inch shows the Ruger LCP’s 2.75” barrel would have to be 3.6” long if it were a 32cal.

You’re also neglecting the fact the longer case may need significantly more powder to hit that’s speed due to the less efficient case design, meaning it would need to be LONGER than 3.6” just to match the performance of the 380. So a 2.75” LCP 380 would be sitting beside a WEAKER 32 Super with a ~3.75-4” barrel.

Again, when you look at stopping power measures, bullet diameter matters significantly. The same weight bullet at the same velocity, but with a smaller diameter will have reduced stopping power. If you try to make up for that loss by expansion, you lose even more, measured by the inefficient Work (physics) lost by destroying the bullet - meaning you’re taking Work away from destroying the target (aka bad guy) and using it to destroy the bullet. Expansion works great when you have excessive Energy on the bullet for the application such the losses can be sacrificed without losing performance, but the tiny 32 just won’t have enough energy to waste Work tearing its own bullet open in a vain attempt to increase Power... the Power is lost...

Bigger, weaker pistols don’t sell well, especially when the ammo costs more and is less available.
 
Here's a P32 (7+1) next to a P380 (6+1) ... roughly same grip length - top to bottom.

View attachment 822641

You’re neglecting the grip length of the P32 and P3AT is predicated by the length of 2 average fingers, not by the minimum stack depth of the cartridges. Follower design, mag design, feed angle, and ergonomic considerations need to be on your radar as YOU continue to develop YOUR pet design.
 
I'm basically sold on this concept. So my work is done. Now it's time for others to make it reality.

I believe that you have the ''concept-to-product'' cycle reversed. Your work is done once you've sold an investor (manufacturer) on the concept.

You have effectively ''reinvented'' the 7.65x20 Longue. If the 7.65x20 Longue, or a close derivative thereof, was ever going to be viable option, that day has long passed.
 
For a 32 caliber bore to match the volume of a .380, it’s a lot more than a half inch. The relative bore volume per inch shows the Ruger LCP’s 2.75” barrel would have to be 3.6” long if it were a 32cal.

You’re also neglecting the fact the longer case may need significantly more powder to hit that’s speed due to the less efficient case design, meaning it would need to be LONGER than 3.6” just to match the performance of the 380. So a 2.75” LCP 380 would be sitting beside a WEAKER 32 Super with a ~3.75-4” barrel..

Alright. This is what I needed to know. Assuming it's accurate, it certainly throws a monkey wrench into the plan.
The next question I have is, if the barrel was kept around 3.25" max, what kind of performance penalty would there be?
Using the Longue's numbers... ~80gr at 1,100 fps... are we talking a loss of 100fps? 200fps?
 
For more capacity and less recoil than a .380, I think .32acp already fits that role. I think the Lehigh Cavitators do a very nice job (at least in testing) of boosting .32 acp performance. So I guess for that reason I am not sold on this new cartridge idea.

I am personally a fan of .32's, because I never seem to shoot .380 pocket pistols as well as a .32 and I've never really subscribed to the thought of something not being "a range gun" as an excuse not to practice with it while still carrying it.
 
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