My thought was a 308 case shortened and a 357-358 bullet, barrels are available. AR10 or AR15 (with larger bolt head). Somebody with QL could give ballistics. Ogive would make diffeence in feeding , like BO. Shorter OAL in AR10 mag and the small neck/case dia ratio is minor problem but you get double stack in mag. Larger base means more fps for given chamber pressure - should get 30/30 performance making a bigger hole. Actually maybe up to 40 or 41 dia?
.30 BRX (7.62x41mm) in an AR15 rifle
- Thread starter Bruce Drake
- Start date
CWLONGSHOT
Well-Known Member
Wow!! guess I need look Closer!! My 450 is also made from the 284win cases.
I agree on molds for the 270/6.8. Its more a jacketed caliber for me. (Same with 6.5)
CW
I agree on molds for the 270/6.8. Its more a jacketed caliber for me. (Same with 6.5)
CW
CWLONGSHOT
Well-Known Member
Isnt that the 358 Yeti?
I was looking at that myself a few years back!
its a easy caliber for Me now as its a barre swap to my 450 BM.
cw
Hawk
Well-Known Member
Not really sure.
Less than the 300BLK, but more than a
300 Weatherby!
I never thought to shoot it past about 250, due to its velocity limitations imposed by having to fit the AR15 magazine, and short barrel, I always figured it to be a close quarters, fast handling gun. And, I like the fact I can form brass from inexpensive 5.56 brass, of which I have many thousands.
I also get a little more velocity from my hand loads than Wilson gets from their factory rounds.
For a long range rifle, I'd probably choose something else.
I am watching this thread with interest.
You guys may convince me to build a new upper or I may just buy my buddies AR10 in .308.
Isn't that what you finally settled on for a pig gun, Ian?
Bruce Drake
Active Member
Hawk....I love my AR10 in 308Win. very nice on Pigs and deer
(just to help convince you to get one)And with the Wilson load data on its 7.62x40WT 125gr BT its about 36" with a 100 yard zero.
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RBHarter
West Central AR
Nope you don't need a 6.8 . All of that odd rim dia 6.8 especially if it's FC with those stupid SRP pockets should be tossed in my bucket o junk .I was gonna suggest that one. I picked up a small bunch if brass one day. There was 6mm PPC AND GRENDELS AND 30 AR. I didnt know the 30 AR was so fat! Its a chopped 30/06-308 .473 head isnt it??
I have never been a 270 guy and pupu the 6.8 for years. Going with the Grendel. But recently I was sorting a pail of brass only to find about 4/500 6.8 & 7.62x39 Brass cases!! Now I got my brain swriling do I now "need" a 6.8 & Ruski??
CW
If it just needs a new home its all welcome here .
I've found the NOE 279-124 to be an excellent performer in 2 barrels at near jacketed speeds .......I've also bought several moulds completely illsuited to the cartridge but may yet work out patched up to 7mm in the 7×6.8 . I have a few of .266 , .268 , .270 dia moulds that might patch up to the needed .279 . In the meantime the only 6.5 available gets a paper patched NOE 260-120 as the , and you won't hear this often , Lyman 266469s nose is to big .
Bruce Drake
Active Member
Hawk,
I can't see your post about the BC on the 125gr 7.62x40WT. I used the BC for the factory load with uses a 125gr Nosler BT bullet.
your .308 125gr Sierra Pro-Hunter has a .277 BC for speeds from 2000-2800fps
So your 7.62x40WT 125gr@2350fps Ballistic chart looks should like this:
If you are hotter than that, just let me know and I'll run the charts for you.
I can't see your post about the BC on the 125gr 7.62x40WT. I used the BC for the factory load with uses a 125gr Nosler BT bullet.
your .308 125gr Sierra Pro-Hunter has a .277 BC for speeds from 2000-2800fps
So your 7.62x40WT 125gr@2350fps Ballistic chart looks should like this:
If you are hotter than that, just let me know and I'll run the charts for you.
Bruce Drake
Active Member
Popper, you are an enabler!
Hawk might already be calling you!I looked up the 358 Yeti and I used to own a 358 Winchester barreled Mauser 48 that was a teeth-rattler with a Lyman 200gr roundnose cast lead bullet at 2100fps. That Yeti looks like it would be the same in an AR15 or AR10.
I just need to find range time now. And that's pretty tight...
Bruce
Ian
Notorious member
217 at a little over 2,000 from my 336 is about as much as I want from a bench, but not bad at all from a standing position or sitting/kneeling. I thought for years that I wanted a .35 Whelen but not so much anymore. Maybe in an M1. If I put together a .358 Winchester it will be in the LR-308 format and probably have a big can on it.
CZ93X62
Official forum enigma
That 6.8 x 43 SPC has intrigued me as a deer-capable swap upper-half for my existing EBR lower, just it and some magazines are all that is needed to start the music. OH--and some components. No off-the-shelf upper halves come without Evil Parts like flash suppressors, so it would need to be a one-off build. By the time I perform the Kabuki Theater steps to enable this to occur, I lose interest and find some other windmill to tilt at. Probably just as well.
Missionary
Well-Known Member
Nothing wrong with that 30 Rusky It was well designed by the WW2 Germans as a short range round that needed fewer materials to get the job done.. Russia improved it for easy manufacture.
We reload it using cast and shoot the day-lights out of our SKS rifles that will probably never ware out
We reload it using cast and shoot the day-lights out of our SKS rifles that will probably never ware out
CWLONGSHOT
Well-Known Member
Recoil is in the shoulder of the beholder...
My BLR 358 wasa beast and cracked three eyebrows, I know of! But its the STOCK more then the caliber. Cause shortly after shooting and hunting with the BLR for a couple years I ran across a Ruger 77 in 358 and grabbed it!! Its recoil, with same loads was VERY PLEASANT!! Factory Silver tips where "rough" In that BLR but MEH in the 77.
My current Ruger is a American 358 is about the same. Maybe just cause its lighter its more. But TAC and a 225 Sierra is right at 2480 fps, and it BARKS, but its not excessive in recoil. Maybe on par with a '06 and heavy 180's.
TAC is proved amazing in the 358. 48.7g is my magic spot. (OVER BOOK LOADING)
cw
My BLR 358 wasa beast and cracked three eyebrows, I know of! But its the STOCK more then the caliber. Cause shortly after shooting and hunting with the BLR for a couple years I ran across a Ruger 77 in 358 and grabbed it!! Its recoil, with same loads was VERY PLEASANT!! Factory Silver tips where "rough" In that BLR but MEH in the 77.
My current Ruger is a American 358 is about the same. Maybe just cause its lighter its more. But TAC and a 225 Sierra is right at 2480 fps, and it BARKS, but its not excessive in recoil. Maybe on par with a '06 and heavy 180's.
TAC is proved amazing in the 358. 48.7g is my magic spot. (OVER BOOK LOADING)
cw
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Rick H
Well-Known Member
Stock fit and slope of comb/cheekpiece has a lot to do with apparent recoil. My Remington 700 BDL in 7mm Rem Mag. with the factory MonteCarlo stock was uncomfortable to shoot, particularly from the bench. The damned thing recoiled up and smacked my cheek. It wasn't unbearable (not a really heavy recoiling rifle) but definitely unpleasant.
I restocked it, with much less drop at comb, a cheekpiece that fit and it made a huge difference. The actual recoil is the same, same rifle same weight, but the fit makes if much more pleasant to shoot from the bench or in the field.
On the other hand my Guide Gun in 45-70 with 385 gr. cast at 1800 fps gets your attention. It will loosen fillings shooting it from the bench and I don't think there is much you can do to the stock to ease the pain other than drilling it full of holes and adding a couple of pounds of lead.
I restocked it, with much less drop at comb, a cheekpiece that fit and it made a huge difference. The actual recoil is the same, same rifle same weight, but the fit makes if much more pleasant to shoot from the bench or in the field.
On the other hand my Guide Gun in 45-70 with 385 gr. cast at 1800 fps gets your attention. It will loosen fillings shooting it from the bench and I don't think there is much you can do to the stock to ease the pain other than drilling it full of holes and adding a couple of pounds of lead.
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Guy with can on his AR10 308 yesterday shooting factory stuff. Sound was like the boys and their BP 45/70s. Thruuump. Another with , I think, 223 pistol but carbine gas. Flame thrower! Begining to think the BO pistol for supers needs port farther out, bolt unlocks too early. Slower powders still burning when the bolt opens and gas everywhere. Sub lesser powder is gone. Lose pressure at the bolt before max fps achieved. Kinda like can back pressure but the bolt is open in that case.