.358 DPMS-pattern AR; It's ALIVE!

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Driftertank

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Finally finished and function-tested my .358 Winchester AR carbine, dubbed "Thumper."
Built on Aero Precision M5 receiver set, with KAK Industry 16" stainless 1:12" mid-length barrel, Aero Precision Nitrided .308 BCG, Odin Works click-adjustable gas block,SLR Rifleworks 11.5" Keymod Solo-lite rail, KAK Industry heavy buffer, and Sprinco "Orange" heavy recoil spring.


In action:
 
Nice build. What bullets are you shooting in that, and you think the pointy ones will expand at the velocities you are getting, or will you need some kind of hollow point for expansion? If you need a hollow point, do you anticipate any feeding challenges?
 
Nice build. What bullets are you shooting in that, and you think the pointy ones will expand at the velocities you are getting, or will you need some kind of hollow point for expansion? If you need a hollow point, do you anticipate any feeding challenges?
That's just the first day of shooting with the rifle. Didn't bring out the chrony for that run, just wanted to make sure it would work.
I started with some factory loaded Hornady 200gr SP to make sure nothing would break, and to set gas level.
Then i switched to a short run of handloads, 200gr FTX over a spread from 44-48gr of H4895, to see if it would function at different gas pressures. Ran without a hiccup.
Now that i have glass on it, my next trip is going to involve testing function, velocities and groups with a range of heads I've picked up: the aforementioned FTXs, 220gr Speer Hot-cor FP, 225gr Sierra GK BT, and 250gr Speer Hot-cor SP. May also work up some loads with #34 primers and Ramshot TAC, as it's reputed to give good accuracy and top velocities in the .358
I'm hoping to see velocities aroud 2500 for the 200s, 2350-2400 for the 220/225 (the sweet spot of bullet weight for .358, i expect), and around 2200 with the 250s.
The rifle SHOULD be ideal for hogs, excellent on deer and elk, and adequate even for moose and bears. At somewhere around 10lbs with a full 10rd mag and a 1.75-5x scope, this is my interpretation of the modern Brush/Guide gun.
 
Damn. I want one
If you've ever built an AR, you could make one like this. No big surprises or special moves in the build. Even the price ended up less than i expected. I had estimated spending between $1800-2000 to finish the build when i started. But careful shopping, waiting for sales, and finding new places to look for parts, it ended up costing just under $1500 before glass....spread out over a year or so.
 
That's just the first day of shooting with the rifle. Didn't bring out the chrony for that run, just wanted to make sure it would work.
I started with some factory loaded Hornady 200gr SP to make sure nothing would break, and to set gas level.
Then i switched to a short run of handloads, 200gr FTX over a spread from 44-48gr of H4895, to see if it would function at different gas pressures. Ran without a hiccup.
Now that i have glass on it, my next trip is going to involve testing function, velocities and groups with a range of heads I've picked up: the aforementioned FTXs, 220gr Speer Hot-cor FP, 225gr Sierra GK BT, and 250gr Speer Hot-cor SP. May also work up some loads with #34 primers and Ramshot TAC, as it's reputed to give good accuracy and top velocities in the .358
I'm hoping to see velocities aroud 2500 for the 200s, 2350-2400 for the 220/225 (the sweet spot of bullet weight for .358, i expect), and around 2200 with the 250s.
The rifle SHOULD be ideal for hogs, excellent on deer and elk, and adequate even for moose and bears. At somewhere around 10lbs with a full 10rd mag and a 1.75-5x scope, this is my interpretation of the modern Brush/Guide gun.

Awesome. Keep us informed on progress.

Hey, send me a PM if you would like me to send along some .358 bullets (on me, no cost to you) left over from a project. I ended up using .357 pistol bullets (XTPs) to get the accuracy and rapid expansion I wanted. As a result, I've got (approximately):

50 180 grain Barnes XFB
100 180 grain Hornady SSP
100 180 grain Speer Flat Nose

The boxes may not be completely full as I probably shot a few from each box.

Include an address and your priorities in case I can't fit them all in one of those small (fixed rate) boxes that I use.
 
That's pretty cool. Those numbers are impressive. I've been thinking about a 35 caliber AR for a while. I'll probably just keep thinking but it's fun.
 
Finally finished and function-tested my .358 Winchester AR carbine, dubbed "Thumper."
Built on Aero Precision M5 receiver set, with KAK Industry 16" stainless 1:12" mid-length barrel, Aero Precision Nitrided .308 BCG, Odin Works click-adjustable gas block,SLR Rifleworks 11.5" Keymod Solo-lite rail, KAK Industry heavy buffer, and Sprinco "Orange" heavy recoil spring.


In action:

nice rifle and in the video did not appear to be kicking that much. is that right or it just looked that way. firing heavy bullets you would think will recoil more then that
 
That would be an awesome cast bullet rifle. I want one. I went to the KAK website and the legal length 358 barrels are out of stock. I can't see spending a $200 tax stamp to use the 12" one.
 
That would be an awesome cast bullet rifle. I want one. I went to the KAK website and the legal length 358 barrels are out of stock. I can't see spending a $200 tax stamp to use the 12" one.
wonder if cast bullet would play havoc on the gas port hole
 
nice rifle and in the video did not appear to be kicking that much. is that right or it just looked that way. firing heavy bullets you would think will recoil more then that
I'm a big guy with pretty good technique. It's not horrible though. Probably about like a 12 or 20 gauge shotgun, recoil wise. Not unbearable, but my friend developed a bit of a flinch trying to shoot for accuracy with it.

It ain't no .223, for sure.

We'll see about the heavier rounds soon though...
 
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I am glad more people who understand ballistics are starting to see the huge power and versatility of the 358 winchester.
I have another project going right now but at the same time I preparing to make an experimental AR10 358W barrel design in 18.5" with concentric cuts for cooling and
threaded for 3/4" so I leave more meat around the muzzle area.

Same thing I did with the 350 Gunner Cat for the AR15...

35_ARGunner_Muzzle06.jpg


I will make a custom 'shorty' brake as well and also an adapter for standard 5/8x24 threads so one could use regular brakes and suppressors
but w/o compromising the minor diameter of the muzzle.

Hog Hammer upper.

35_Gunner10_Inchupperhammer.jpg
 
It never took off as a popular caliber, which means factory ammo is hard to find. The numbers on paper don't look impressive in the world of 3,000fps magnums and .50 cal shoulder cannons....but it seems, among the users in the field, the .35 calibers live in a special little corner where unimpressive numbers correspond to impressive performance on game. Big expansion, deep penetration, and very efficient use of powder space means the .358 should be a versatile medium and big game rifle, in a familiar, well balanced and fast-handling package.

Yes, i write my own ad copy....
 
I have an AR in .358 WSSM. It gets a little higher velocity, but not a ton, maybe a couple hundred fps. I can assure you that it hits with authority.
 
The numbers on paper don't look impressive in the world of 3,000fps magnums and .50 cal shoulder cannons....but it seems, among the users in the field, the .35 calibers live in a special little corner where unimpressive numbers correspond to impressive performance on game.

Hi what caliber are you referring to, the 358 winchester?

If so, the 358 winchester loaded full power offers equivalent Big Game killing power to the mighty 300 Winchester magnum at 100 yards.

The 358 launches a 225gr bullet at 2550fps from a 22" barrel that with a 225gr nosler balistic tip puts 3,250ft-lb at the muzzle and 2,351fps / 2,760ft-lb at 100 yards.

300 win mag with 180gr sp @ 100 yards

upload_2017-2-25_18-44-6.png

358 winchester 225gr partition @ 100 yards

upload_2017-2-25_18-45-2.png

upload_2017-2-25_18-47-24.png


Commercial Full Power Ammunition from Buffalo Bore...

https://www.buffalobore.com/index.php?l=product_detail&p=249

Just to put things a bit into perspective it provides about the same killing power at
200 yards as the hottest premium 30-06 at 100 yards when loaded with 180gr
bullets.

So this round is pretty capable for some of the largest animals walking on the planet including our alaskan grizzly, polar bears and largest moose given average/ moderate ranges.

So I would say the 358 is pretty impressive. Perhaps this type of misconceptions in ballistics is what is causing people to think there is some sort of lack of power when in fact there is huge killing power at hand and from nothing more than a 308 case necked up to 35 caliber.

I also see a lot of companies like hornday, winchester, etc.. do not load to full potential and that might be a good thing if one is going to shoot a hog or a deer and wants to have some meat left to eat.
 
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Just to put things a bit into perspective it provides about the same killing power at
200 yards as the hottest premium 30-06 at 100 yards when loaded with 180gr
bullets.

Sorry, but no! You're comparing very mild 30-06 loads to some pretty extreme 358 loads that may or may not be possible to achieve. But assuming 2550 fps from a 358/225 is possible lets compare it to other cartridges. A 180 gr Accubond in 30-06 can be loaded to nearer 2900 fps, not 2700 fps. Assuming 2850 fps ( about where mine are loaded) the 30-06 trails 358 by only 40 ft. lbs. energy at the muzzle. At 100 yards the 30-06 load will have almost 600 ft lbs more energy than 358 has at 200 yards. The 30-06 will lead by about 200 ft. lbs if both are impacting at 200 yards and the gap widens as range increases.

The best 308 factory loads will push 178-180 gr bullets over 2750 fps and pass the 358 at some point inside of 200 yards. The 358 has an edge at the muzzle, but a 30-30 will kill any animal in NA at the muzzle.

http://www.hornady.com/store/308-Win-178-gr-BTHP-Superformance-Match/

Wanna compare 358 to 300 mag. My 300 WSM shoots 200 gr ELDX or Accubonds to 2800 fps for almost 3500 ft. lbs. at the muzzle. At 200 yards it beats 358 by about 500 ft. lbs. And it does it with less recoil than 358. These are real numbers from real rifles, not potential numbers made up by looking at loading manuals. Start shooting 180 or 200 gr bullets from 300WM and the difference is even more substantial. A 300 WM firing 200 gr bullets at 2950 fps. has about the same energy at 200 yards that the 358 has at the muzzle.

Plus the 200-220 gr 30 caliber bullets have proven they will out penetrate anything in 33 or 35 calibers on large game.

Will a 358 kill any animal in NA? You bet it will. But so will every other cartridge that has been developed since the 1890's. The 358 is an interesting cartridge, but there is a reason it never caught on and will always be a niche cartridge. In the real world it fills a very narrow gap between 308 and 30-06 at close to medium range, but with near 300 WM recoil. Beyond 200 yards it can't hang with even 308; 30-06 and 300 mag beat it at all ranges. Most hunters they have decided that if they are going to deal with recoil greater than 30-06, then they want more performance than 30-06.
 
Sorry, but no! You're comparing very mild 30-06 loads to some pretty extreme 358 loads that may or may not be possible to achieve. But assuming 2550 fps from a 358/225 is possible lets compare it to other cartridges. A 180 gr Accubond in 30-06 can be loaded to nearer 2900 fps, not 2700 fps. Assuming 2850 fps ( about where mine are loaded) the 30-06 trails 358 by only 40 ft. lbs. energy at the muzzle. At 100 yards the 30-06 load will have almost 600 ft lbs more energy than 358 has at 200 yards. The 30-06 will lead by about 200 ft. lbs if both are impacting at 200 yards and the gap widens as range increases.

The best 308 factory loads will push 178-180 gr bullets over 2750 fps and pass the 358 at some point inside of 200 yards. The 358 has an edge at the muzzle, but a 30-30 will kill any animal in NA at the muzzle.

http://www.hornady.com/store/308-Win-178-gr-BTHP-Superformance-Match/

Wanna compare 358 to 300 mag. My 300 WSM shoots 200 gr ELDX or Accubonds to 2800 fps for almost 3500 ft. lbs. at the muzzle. At 200 yards it beats 358 by about 500 ft. lbs. And it does it with less recoil than 358. These are real numbers from real rifles, not potential numbers made up by looking at loading manuals. Start shooting 180 or 200 gr bullets from 300WM and the difference is even more substantial. A 300 WM firing 200 gr bullets at 2950 fps. has about the same energy at 200 yards that the 358 has at the muzzle.

Plus the 200-220 gr 30 caliber bullets have proven they will out penetrate anything in 33 or 35 calibers on large game.

Will a 358 kill any animal in NA? You bet it will. But so will every other cartridge that has been developed since the 1890's. The 358 is an interesting cartridge, but there is a reason it never caught on and will always be a niche cartridge. In the real world it fills a very narrow gap between 308 and 30-06 at close to medium range, but with near 300 WM recoil. Beyond 200 yards it can't hang with even 308; 30-06 and 300 mag beat it at all ranges. Most hunters they have decided that if they are going to deal with recoil greater than 30-06, then they want more performance than 30-06.

Hi jmr40,
Please let me further explain.
The buffalo bore loads for both calibers were taken from high performance grizzly loads that like other high performance are well known to be true and tested and great killers no matter what choice of caliber.
Unlike other ammunition manufacturers they even advertise the actual firearms used for testing and more can be obtained with careful reload and testing.
I compared to the same full power loads and type of bullet from the same manufacturer, buffalo bore in this case.
Please notice the 225gr 358win is mislabeled and based on their tests and our own experience can produce more speed with soft points than the solid bullets.


upload_2017-2-25_23-35-30.png

upload_2017-2-25_23-37-35.png


If you look at the speeds from hornady superformance those are projected from 24" barrels and of course this is relative because many people end up with
a more popular 20 to 22" barrel yet, of course one can achieve more with either caliber, with longer barrels, and with careful reloading.

Also I am referring to killing power that is directly proportional to momentum, SD and frontal section, not energy alone. Energy might be higher with both the WM and 30-06 but not momentum and killing power, all complete different things.

Energy says something of course but it doesn't define the killing power as other vectors need to be introduced like speed, grain, sd, frontal section and of course the proper terminal design.

The kinetic energy is also source for a lot of talk and confusion and never understood well why companies advertise it including muzzle values.

Don't get me wrong the 30-06 and 300 WM are both excellent killers and need no introduction but this is just to say that there is more about the 35 winchester that meets the eye and
why it is a popular fast killer, just like the whelen that is another huge powerhouse even with 250gr bullets.

The 35 winchester is not for long range or to be matched to certain magnums or other calibers at a distance but it provides some distinctive advantages and in great part due to the
amazing capability for the 35 caliber bullets to provide fast kills including the larger game.

Regarding recoil there is no way around. One wants power (momentum), one gets recoil. That is the trade-off as dictated by physics.

In a nut shell we can summarize its characteristics like this:

- It shoots with the trajectories of a 308 Winchester to 300 yards bringing more momentum and killing power.
- It uses 308 cases that can be easily reloaded, one quick run through the die and presto.
- It brings mangum-like killing power (not simply energy) to the average ranges most people hunt within 100-200 yards.
- Loaded mildly makes a great white tail and hog round and it can use inexpensive 357 pistol rounds for practice and these or other smaller game.
- It is very efficient with 20" barrels loosing the least amount of potential in the absence of longer barrels like 24" inches.
- That coupled with being a short action and standard bolt face makes an easy alternative for a huge number of actions and magazines including the AR10.
- This cartridge can be included a decent brush hunting round where the 338, 30 and smaller faster calibers will face huge deflection.
- With the right twist will deliver 310-320gr cast boolits what will put some substantial energy and can be very quiet with supressor like any subsonic round.

Look at my previous posts and run the math with power factors and hits ranking, some I posted.

The ones who use it never give it up. It is a true hunters cartridge that puts huge deep holes including in the largest game one will find. It is an extra insurance policy.

I hope this helps understanding the 358 winchester a bit better .
 
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Cool!

I preparing to make an experimental AR10 358W barrel design in 18.5" with concentric cuts for cooling and
threaded for 3/4" so I leave more meat around the muzzle area.

The minor diameter of 5/8-24 is .580"-.587". That's plenty of meat with a .358 bore, even if you were using a hot number like the .358 STA. Heck, I've seen more than one .300 mag threaded 1/2-28.
 
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