10mm resurgence

sparkyv said:
I'm a 10mm and big bore handgun enthusiast, but cringe when I consider the 10mm in a concealed carry platform! :eek:
The worst handgun beating I've ever experienced was full house loads of .357 Mag in a 3" J-frame. I didn't even finish the five rounds in the cylinder, and bled during the remaining range session.
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I have been Concealed carrying a 10mm for the last 5 years, but it is a full size Glock 20.
IMG_1760.JPG
I have zero interest in a compact or sub compact in any caliber.
 
For my G29, I did drop down bullet weight to 165gr bonded jhp offered by Underwood. I don't have a crono, but they certainly are peppy. Also this is primarily for CC, so mitigation of over penetration and dumping all the of the energy into the intended target is my goal.

In my full size guns for outdoor use, 180 for walking around/general use. I was hoping to get a deer this year with some 200gr or 220gr hardcast.

I dont reload, I am not an expert. About the only thing I do, is research whether the advertised velocity is close to actual velocity and avoid paying for what is essentially overpriced .40.
 
21H40 said:
I've heard this several times on THR for 10mm, but not for 357. It seems like 357 in anything less than 4" barrel would have a very similar problem with unburned powder or unrealized potential.
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In my estimation, the problem of velocity loss due to reduced barrel length is worse with .357 Magnum than with 10mm. There are two reasons for this.

The first is that the slow burning powders associated with top velocities in .357 Magnum take longer to burn. Anyone looking at Quickloads can easily see the percentage of powder burned, as calculated for a given barrel length (and all the other data input). But if a modelling program were not enough to convince someone that this happens, I would then ask what exactly they though caused muzzle flash, if not powder burning outside the muzzle? 10mm typically uses faster burning powders that offer a more complete burn even in a relatively short barrel.

The second reason is maximum average pressure. The .357 Magnum is set at 35,000psi (same as standard pressure 9x19mm and several other cartridges). 10mm was established as a 37,500psi cartridge. More pressure is more pressure.

A potential third reason could be (in some cases), reduced bearing surface for the same bullet weight. For a given volume, the longer and narrower a cylinder is, the more surface area it has. Therefore the more bearing surface it is likely to have in a barrel. More bearing surface means more friction, which means more resistance to acceleration.
 
460Shooter said:
Yep!
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Any accuracy issues with the 220 over 200gr Hardcast? I have been told by several people that the 220s are not as stable as the 200s (both Underwood), but not had any issues using them in my G20, but I only use them when walking the fence lines where I might cross paths with just about anything.
 
jmohme said:
Any accuracy issues with the 220 over 200gr Hardcast? I have been told by several people that the 220s are not as stable as the 200s (both Underwood), but not had any issues using them in my G20, but I only use them when walking the fence lines where I might cross paths with just about anything.
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In watching different YouTube videos as part of my research in determining which 10mm to purchase. They have said that 220 grain hardcast loads are more finicky than the 200 grain. I'm glad to see that you can use either/both.
 
My big question with running 220gr hardcast vs 200gr (or even 180gr) is, what is really being gained? Penetration depth?

A greater mass has its benefits, but at a certain point sacrificing velocity for a heavier bullet just isn't paying off, because adequate penetration has already been achieved.
 
WrongHanded said:
My big question with running 220gr hardcast vs 200gr (or even 180gr) is, what is really being gained? Penetration depth?

A greater mass has its benefits, but at a certain point sacrificing velocity for a heavier bullet just isn't paying off, because adequate penetration has already been achieved.
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Probably nothing unless you need to penetrate a really thick hide.
I only carry mine loaded with hardcast when I am working on our property in east Texas piney woods. I will probably never encounter a bear, but a ticked off wild hog protecting her young is a real possibility, and I have personally seen a hog take a head shot and just get even more ticked off.
Thats why I refer to these loads as lipstick for a pig.
EDC_G20_HCRed.jpg
 
jmohme said:
Any accuracy issues with the 220 over 200gr Hardcast? I have been told by several people that the 220s are not as stable as the 200s (both Underwood), but not had any issues using them in my G20, but I only use them when walking the fence lines where I might cross paths with just about anything.
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I can't comment. I don't shoot any 10mm's with polygonal riffing and have no need for bullet weights that heavy where I live.

I just picked up some 200 gr HSTs the other day to try out, but no 220s.

I do plan to load some 190 gr copper monolithics with a flat meplate in the near future. They are cnc machined by Cutting Edge bullets. I figure they will do the job nicely if needed on any angry milk jugs.

Honestly I always thought if I was going to press into the 220 or heavier bullet range I'd step up to a 44 magnum.

@tommy.duncan might be able to tell you better. He has far more 10mm experience than I do.
 
My current carry loads based on pistol:

G40 220 gr Underwood Hardcast (dedicated woods gun)
S&W MP 2.0 4.6” 200 gr Underwood JHP
G20 gets the same 200 gr Underwood load
Springfield XDM Elite 3.8” 165 gr Underwood GD JHP

I also have 180 gr XTP with a hefty load of 800X that I won’t hesitate to carry in either of the top 3 and am working up a Nosler 200 gr load to mimic the Underwood offering as well.

Also won’t hesitate to carry the 220 Hardcast in either of the top 3.

Underwood’s 200 gr Hardcast also shoots well so I would pick either, based on availability, for woods carry.
 
WisBorn said:
When comparing 40 to 10mm there is about 250 fps difference in velocity when using the same bullet weight and design. Now of course when you shorten the barrel length in both cartridges you are going to lose velocity. The question is will you reduce the velocity more in the 10mm than you do in the 40. And if it deletes the velocity advantage all together. @Buckeye63 was suggesting adding a subcompact and/or micro compact 10mm to the available options. I like small guns also.
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percentage speaking… that’s 25% more power! and I bet hand loader can safety produce 30-40% more power that factory .40
 
460Shooter said:
@tommy.duncan might be able to tell you better. He has far more 10mm experience than I do.
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Thanks brother,

I have shot some 220g but it was more function testing then accuracy. I live in the DC area and my defense rounds need to stop small black bear and 2 legged critters.
I usually carry Underwood 180xtp, in more "urban" areas I carry 180g HST. I have never looked into extensive shooting of hardcast or 220 grain, maybe I will start testing.

I have lots of lead and molds just in case but haven't needed to yet, i guess I should before I need to.
 
The S&B 180 JHP is a good, accurate, factory round, leaving my 6” barrel at 1200 fps.

The fired S&B brass gets the Barnes 155 grain Tac-XP hand loaded to 1400 fps. Less recoil than the 180’s.

I mention this because both loads have the same POI out to 50 yards. Which is often my goal.
 
My first and only 10MM is a RIA 1911 with a full rail style frame.The extra steel out front makes it an easy gun to shoot as far as recoil goes.The cartridge itself seems to have some inherent accuracy.Several of my friends also have 10's and they all say the round shoots well in several different platforms.Two of them shoot Sig X10's and they do very well.I have a Leupold DPP on mine and 180 grain handloads loaded full power with AA9 will usually stay inside of 4 inches at 50 yards.I've deer hunted with it the past two seasons,but couldn't get the deer to cooperate.
One nice thing about the 10MM's comeback is the number of 40's that are up for sale for cheap prices.I just bought a Smith and Wesson M&P 40 Performance Center gun two or three weeks ago at the LGS for a song and didn't have to do a good job of singing it,and that pistol is impressive.It's very accurate and the ported barrel makes it feel like a hopped up 9MM.I bought 500 Hornady HAP's at 180 grains to shoot in my 10 for lighter practice loads and they shoot crazy good in the M&P.The manager at the LGS said the M&P I got was so cheap because the 40 is dead and the 10MM killed it.Thanks to the 10 killing the 40,I now have two Performance Center 40's in my safe and I'll love them forever and ever and I don't care how dead they are.
 
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