I just read about this in the Dillon's Blue Press. I've not heard of this caliber and if I read it correctly all you need is a upper to fit a AR type rifle. The data shows a little more energy than a 7.62 X 39 round. Wondering if any have heard about it?
Wilson's 7.62X40 ??
- Thread starter joem1945
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Came out about the same time as the 300 BO, but with less fanfare. A 5.56 case cut back to 40mm and necked up to .308. Compared to the BO it has slightly more case capacity to give a little more punch with the supersonics, but not ideal for subsonic use. Polymer mags are preferred since shaving the front rib is neccessary to clear thr bullets ogive and feed right. Wilson Combat sells preshaved Lancer mags too.
http://wilsoncombat.com/new/762x40-project.asp
http://wilsoncombat.com/new/762x40-project.asp
jonnyc
Member
So what's the benefit over a factory-built 7.62x39 rifle variation and lots of cheap, easily found 7.62x39 ammo?
Caliper_Mi
Member
Aware of the 7.62x40 round, but 300BO has pretty much won out in the market. I've heard brass forming for x40 out of .223 isn't as reliable as making 300BO as well, can't verify personally though.
By factory built, do you mean an AK variant? Advantage is AR ergonomics and accessories.
Vs a 7.62x39 AR, benefit is 7.62x39-like ballistics in a standard AR15 (not the non interchangeable receivers that the AK mag RRA and CMMG rifles use) with reliable and readily available mags.
ETA: What I want is more companies making stuff like this: http://ar-47.com/pics.html
Takes all standard AR parts, but AK mags.
By factory built, do you mean an AK variant? Advantage is AR ergonomics and accessories.
Vs a 7.62x39 AR, benefit is 7.62x39-like ballistics in a standard AR15 (not the non interchangeable receivers that the AK mag RRA and CMMG rifles use) with reliable and readily available mags.
ETA: What I want is more companies making stuff like this: http://ar-47.com/pics.html
Takes all standard AR parts, but AK mags.
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rbernie
Contributing Member
Biggest benefit for this kind of round over a 7.62x39 upper is bolt life. The larger rim/case head of the 7.62x39 (.442) thins the bolt face towards the locking lugs vs. 30 cal rounds that use the 5.56x45 as the parent case rim/face (.385).
db_tanker
Member
lol 300 whisper or 300-223 wildcat.
give it a one degree difference on the shoulder or a tenth here or there...and you have reinvented the wheel.
give it a one degree difference on the shoulder or a tenth here or there...and you have reinvented the wheel.
jonnyc
Member
"By factory built, do you mean an AK variant?"
No, I meant both out-of-the-box AKs and ARs factory chambered in cheap and plentiful 7.62x39.
No, I meant both out-of-the-box AKs and ARs factory chambered in cheap and plentiful 7.62x39.
Arizona_Mike
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Think 300 BLK optimized for supersonic.
Mike
Mike
griff383
Member
A buddy has one but only because he lives in a state that doesnt allow suppressors. Great round if only shooting supers AND you reload, I would have done the same as him if I were in a non suppressor friendly state
wally
Member
I'll take oddball receivers and unmodified proven reliable magazines over oddball ammo and modified magazines every time!
The "standard" 7.62x39 AR uppers show the virtues of the arrangement, but seems nobody has been able to totally solve the tapered round in the straight magwell problem. Seems once you go beyond 10 rounds in the magazine other than FMJ ammo can get iffy.
Panzerschwein
member
Sounds like a good round.
.300 BLK is obviously superior but any .30 AR is good in my book. This one seems to have a little more power. That's a good thing.
.300 BLK is obviously superior but any .30 AR is good in my book. This one seems to have a little more power. That's a good thing.
HankB
Member
With everyone and his brother coming out with their own "new" cartridges, which are just different enough that they won't interchange with similar rounds, I'm more and more convinced of the virtue of staying with standard rounds and avoiding the outlying oddballs.
I guess you're not interested in the newer 277 Wolverine then.
http://www.maddogweapons.com/277-wolverine.html
wally
Member
I see little reason for it unless you really like to reload. Essentially the same velocity in a 110gr bullet as cheap 7.62x39 123 gr ammo. The 6.8 vs 7.62 ballistic coefficients can't be all that much better. At least the 6.8 SPC has enough extra velocity to be significantly better at longer ranges.
I'm really like my 7.62x39 AR despite the sometimes wonky mags, I'm much more excited about the CMMG Mutant than any oddball caliber.
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