mcb
Member
The DPMS/Remington Defense GII/R10 is only slight longer than an AR-15 and nearly as slim and... Never mind they're dead...
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AR15 equivalent for .308
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someguy2800
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I built an AR10 last year but I just couldn’t like it.
The DPMS/Remington Defense GII/R10 is only slight longer than an AR-15 and nearly as slim and... Never mind they're dead...
Yeah I posted about them back on the first page. They do feel great in the hand, I would love to have one.
Varminterror
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Whole-heartedly agree...
If a guy is willing to load one cartridge to pressures significantly over SAAMI MAP, then they have to un-handcuff the other cartridge in the comparison as well.
The only time I would concede to one cartridge being cuffed and the other liberated is the instance where we’re comparing something in the same action - for example, comparing the 6.5x55 swede and the 260 Rem or 7x57mm and 7-08, the old Mausers were designed in a time of lower pressures, the ‘08 babies designed in the modern era of higher MAP’s. Given the same action, there’s no reason to restrict either cartridge to a lower pressure and/or bolt thrust than typical for the rifle’s design standard.
Otherwise, loading one round way over MAP and holding one to its standard isn’t a fair game.
CraigC
Sixgun Nut
You can take bigger critters with cartridges like the .450BM, .458SOCOM and .50Beowulf but not much chance of fully duplicating .308 performance out of an AR15. It's astonishing what we're able to squeeze out of a semi-auto platform designed for the poodle shooting .223.
Varminterror
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Technically, the AR was designed for the 308, then subsequently shrank in deference to the smaller 5.56. We’re not talking about much difference in the actual action strength, but rather a physical limitation for cartridge length.
I expect maybe the bigger difference is the public realization that it doesn’t take 60-80grn of powder to kill whitetail deer. We’re seeing more and more folks opening their eyes to the fact the old “standards” of 500ft.lbs. for deer and 1,000 for elk just don’t hold water.
So honestly, replicating the 308win in an AR-15 really isn’t a terribly productive pursuit.
I expect maybe the bigger difference is the public realization that it doesn’t take 60-80grn of powder to kill whitetail deer. We’re seeing more and more folks opening their eyes to the fact the old “standards” of 500ft.lbs. for deer and 1,000 for elk just don’t hold water.
So honestly, replicating the 308win in an AR-15 really isn’t a terribly productive pursuit.
CraigC
Sixgun Nut
Ugh, foot pounds. We'd all be better off without them.
Honestly, cartridges like the 6.5Grendel are all most deer hunters need. IMHO, once you get to AR10's, the rifles are just too heavy to fool with for hunting.
Honestly, cartridges like the 6.5Grendel are all most deer hunters need. IMHO, once you get to AR10's, the rifles are just too heavy to fool with for hunting.
<*(((><
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Do tell your brass secrets, as a future Yeti owner.
Poper
Member
if a fellow is looking for .243 WSSM brass, it is readily available from Hornady. Winchester brass is around but appears to be seasonal.
The WSSM case has a similar capacity to the .243 Win. / .308 Win. family, & should be / could be a viable vehicle for near
.308 performance with a .30 cal. bullet. My hope is my .264 WSSM will match or exceed 6.5x55 performance. Experimentation has barely begun, though, and is currently on hold until a loading bench is constructed and back in action.
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Posts have been removed that did not rise to the standards of THR. Stop the pissing contests and act like of adults or take a break and go outside.
someguy2800
Member
I have a thread on the MDWS forum detailing all of it, but I will cliff note.
The 358 yeti chamber is cut to be able to accommodate brass formed from any 308 bolt head case without neck turning, so that means it has a rather large neck in the chamber to ensure safety. The first batch I formed from commercial 308 winchester brass. It turned out that this brass was too thin where the new neck is formed and after one firing and sizing, the sizing die would no longer size the neck down enough and I would not have enough neck tension anymore. It also had a huge amount of neck clearance in the chamber, like .015". Next I tried lake city 7.62 nato brass. The nato brass was thicker but the problem I found with that is the new formed neck is part of the old shoulder and part of the body of the nato case, so the base of the new yeti neck is sufficiently thick, but the neck tapers in thickness toward the front. The front of the neck is still too thin and after a couple firing it will be too thin and the neck tension goes away. After 2 or 3 firing you can insert a bullet partway into the neck by hand after sizing.
Next I decided to form some out of Federal 270 win brass. I happen to have about 500 rounds of once fired Federal 270 brass that my hunting partners gave me. This worked much better as the old neck and shoulder are completely cut off and the new neck is formed out of the body of the case so the necks are consistent thickness and they fit the chamber very well. Like .004" neck clearance on a loaded round. After this I was still getting a lot of flyers though and huge variations in velocity. Finally while loading a batch I noticed that the powder sat at way different levels in some cases. I weighed all my cases and found that approximately 1/4 of them weigh about 155 grains, 1/4 are 166 grains, and 1/2 of them weigh about 172 grains. This brass was accumulated over about 30 years so apparently Federal must have gone through 2 different redesigns of the brass during this time because there were 3 distinctly different weight groups of brass with hugely different internal capacities. I sorted out all the cases to be just the 172 grain ones and that solved all my issues. I now get very consistant velocities and it shoots just over an inch at 100 yards.
So my advice to would be Yeti owners would be to start with a longer case such as 30-06, 270, 25-06, ect... and to weight sort your cases! If I had done that from the start it would have been smooth sailing. I am shooting 180 grain speer's with CFE BLK at 2500 fps. Next year I am going to try some 220 gr speer and 225 gr sierra's.
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@someguy2800 Thank you! That'll help in the future. I'm really pretty excited about the performance of the Yeti, it seems to be a powerhouse in the AR15. I was very close to start down the road of the 458 Socom and still may at some point but I've always wanted a good .35 cal hunting AR.
someguy2800
Member
You won't regret it. It shoots great and is very easy to make cases for. I do not anneal or anything, I just cut off 270 cases at the shoulder, form them with hornady one shot, trim debur, and load. Much less drop and drift than 450 or 458 as well.
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Newtosavage
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Yeti reminds me a lot of the 7.62x39 from first glance. What am I missing?
Its pushing a bigger/wider 200gr bullet roughly the same speed as the 7.62x39 123gr
Lennyjoe
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troy fairweather
Member
I would be happy with 35 rem speed from the ar-15. The 35 rem some how kills better then it should, I'd like to see more 9x39 but most seem to be subsonic loads, and I don't know if there making any AR barrels. I do wonder how fast it would push a 200gr bullet.
Newtosavage
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I'm trying to figure out how that is possible from roughly the same case size. I get that a larger bore will usually result in a little more velocity for the same bullet weight, but if we're talking 200g vs 123's???
someguy2800
Member
You hit the nail on the head. It is basically a scaled up 7.62x39. What 7.62x39 does with 30 grains of powder and a 125 grain bullet, the 358 yeti does with 40 grains of powder and a 180 grain bullet.
Having now taken game with both I am very happy with it. I hunted with my 7.62x39 two years ago and loved hunting with the AR15, but was not satisfied with the blood trails I got. The 358 fixes that handily. Massive blood trails from both sides. Just what I was looking for.
someguy2800
Member
358 yeti is a 308 case head with about 40 grains powder capacity and 55,000 psi pressure limit
Left to right
7.62x39 125 accubond
358 Yeti 180 speer hot core
444 marlin 320 gr cast
25-06 120 fusion
mcb
Member
358 Yeti looks more like a scaled down 458 SOCOM to me.
I will stick with my 450 Bushmaster for Thumping Fun and 30 Remington AR for 30 cal speed, 300 AAC Blackout for quiet fun, and 5.56x45mm for cheap blasting fun from my ARs
I will stick with my 450 Bushmaster for Thumping Fun and 30 Remington AR for 30 cal speed, 300 AAC Blackout for quiet fun, and 5.56x45mm for cheap blasting fun from my ARs
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someguy2800
Member
mcb
Member
I have no doubt down-range energy retention of Yeti is good compared to the big bores but with my 450 Bushmaster I have pushed a Barnes 200 PBX to just over 2600 fps. That exceed 3000 ft-lbs of energy from an AR. I suspect if it was a lead or a lead core 200gr bullet I could probable eek a touch more out of it. I suspect you could do similar with 458 SOCOM. No doubt at some relatively short distance down range Yeti starts passing it up but for pure close range thumping it hard to beat the big bore AR cartridges.
If only they had made 450 Bushmaster on the same bolt and barrel extension at 30 RAR... Now that would be a thumper.
someguy2800
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silvermane_1
Member
IIRC that's what the 6.8 SPC is based off of.
Edit: Nope the 6.8 SPC is based off of the 30 Rem and not the 30 RAR.
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