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Started By
Message
Designing a cartridge for an AR platform
Posted on 1/22/16 at 8:52 pm
Posted on 1/22/16 at 8:52 pm
I am currently working on developing a short 338 caliber cartidge that is more powerful than the 5.56 nato and 7.62x5/7.62x39. I want it to be more accurate than all 3
Currently I plan on it firing 300 grain SMK (Sierra match King) projectiles @ 2550 FPS, which is 4331 ft lbs of energy at the muzzle
I want the recoil to be manageable, and I do not want this round falling into the same category as a .50 Beowulf and .450 bushmaster. I want this to be an anti personnel round rather than a anti vehicle round (like the two I just mentioned)
I want this round to be dead accurate beyond 500 yards out of an 18 inch barrel AR configuration
What do you guys think? There already is a 338 spectre, but this passes it up
Currently I plan on it firing 300 grain SMK (Sierra match King) projectiles @ 2550 FPS, which is 4331 ft lbs of energy at the muzzle
I want the recoil to be manageable, and I do not want this round falling into the same category as a .50 Beowulf and .450 bushmaster. I want this to be an anti personnel round rather than a anti vehicle round (like the two I just mentioned)
I want this round to be dead accurate beyond 500 yards out of an 18 inch barrel AR configuration
What do you guys think? There already is a 338 spectre, but this passes it up
9
Posted on 1/22/16 at 8:58 pm to The Silverback
Be careful. Also, 4331 is 185 grain VLD .30-378 range with 28 inch barrel. I don't know if that is possible...
Edit: yeah, that won't happen actually.
Edit: yeah, that won't happen actually.
This post was edited on 1/22/16 at 9:19 pm
Posted on 1/22/16 at 9:02 pm to ChatRabbit77
The hornady ballistics calculator told me that.
Posted on 1/22/16 at 9:10 pm to The Silverback
A 300 grain projectile at those velocities? That thing would be a cannon. I doubt an AR could hold up to that.
Posted on 1/22/16 at 9:13 pm to The Silverback
Yeah, you plugged in numbers. It isn't even possible. 300 grain Scenar .338LM out of a 20 inch will do a little over 2600. It is a huge case. No way you will get that same velocity with a shorter barrel and that much less powder to burn. Just won't happen from an Ar15 platform.
Posted on 1/22/16 at 9:17 pm to The Silverback
What your drinking baw? This idea of yours is not exactly feasible. You want a heavy bullet...pick a 458 or 50b. You want a 30 cal...go 308. You want a crappy intermediate cartridge...get a dam ak.
Posted on 1/22/16 at 10:35 pm to H.M. Murdock
.50 Beowulf can shoot a 300 gr bullet at a max of ~ 1832ft/ sec
A .338 caliber even in a necked down .50 Beowulf won't get you anywhere close.
I really don't think you could get that in an AR-10 platform and its longer bullet capacity even if you were able to get more case capacity like the beowulf does.
A .338 caliber even in a necked down .50 Beowulf won't get you anywhere close.
I really don't think you could get that in an AR-10 platform and its longer bullet capacity even if you were able to get more case capacity like the beowulf does.
Posted on 1/22/16 at 11:02 pm to bbvdd
Exactly, his figures would be a good bit more energy than even the hottest .300 win mag loads. No way you could get close to that even if you use an AR-10 platform.
Posted on 1/22/16 at 11:18 pm to The Silverback
That's some real pie in the sky stuff right there
Posted on 1/22/16 at 11:18 pm to The Silverback
quote:
Currently I plan on it firing 300 grain SMK (Sierra match King) projectiles @ 2550 FPS, which is 4331 ft lbs of energy at the muzzle
You should sell this to the military after creation.
I'm guessing 2000fps is your ceiling for that bullet. Which would still be outrageous.
Posted on 1/23/16 at 9:22 am to The Silverback
I'm assuming you're planning this for the AR10 platform. I'd think a reasonable upper limit would be 308 Win based cases. The 338 Federal (308 Win necked up to 338 caliber) will do 2660 fps w/ a 200 gr bullet. The 358 Win (308 case w/ 35 cal bullet) pushes a 250 gr bullet to 2490 fps.
According to the Sierra Reloading Data Manual, the 338 Win Mag does a 300 grain bullet at only 2400 fps, but from a 21.5" barrel. To get to 2660 fps, you'd need a 338 Remington Ultra Mag, 79.5 grains of IMR 4831 (for comparison, the max 223 Remington loads will usually use around 25 gr of powder) and 26" of barrel. I don't think it can safely be done (which is why you've not read of someone else already having done it). Be safe.
According to the Sierra Reloading Data Manual, the 338 Win Mag does a 300 grain bullet at only 2400 fps, but from a 21.5" barrel. To get to 2660 fps, you'd need a 338 Remington Ultra Mag, 79.5 grains of IMR 4831 (for comparison, the max 223 Remington loads will usually use around 25 gr of powder) and 26" of barrel. I don't think it can safely be done (which is why you've not read of someone else already having done it). Be safe.
Posted on 1/23/16 at 11:12 am to The Silverback
Go buy a NEMO arms ar in .300 win mag
Posted on 1/23/16 at 1:14 pm to The Silverback
Obvious troll thread is obvious
Posted on 1/23/16 at 1:30 pm to The Silverback
quote:
Silverback
Is legitimately a troll. Ignore his threads. They're all a joke.
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