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Last edited by majohnson; 02-22-17 at 22:47.
I have a 6.5 Creedmoor AR-10 already and more than a couple AR-15's just trying to push the envelop with the mouse gun.
Word. 5.56/.223 is great and all, but there really is a point of diminishing returns with that cartridge (as with any cartridge).
I wouldn't invest a ton of money in making a 5.56/.223 gun into a long range beast. It's good at what it does. Kinetic energy at distance, bucking wind, etc. are not it's strengths.
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Last edited by bfoosh006; 08-29-17 at 19:34.
Interesting and well done test. M193 is the only round that seemed to max out at 26". All others were still gaining velocity.
These results seem to conflict with other info that is specific to ar-15's. I wonder if this is due to the gas port bleeding pressure in an ar, vs bolt gun used in this test.
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There are other issues to consider other than velocity. The more barrel length you add, the more stress you add to the upper receiver. Especially with a heavy bull barrel in a free floating handguard. More barrel beyond 24" doesn't get you much more velocity and the chances of springing the receiver go way up.
Personally I'd go with a 24" barrel, chamber it in 5.56 and load accordingly.
Interesting read, good luck!
Seeing how i'm in the middle of a 308 build, I found this article particularly interesting. Also that a guy can afford to whack his barrel with chop saw. And all this time I thought my Dewalt was only good for cutting crown molding. Shoot, I could be cuttin' on my friends barrels.
The question for me, is value per inch vs. usability. I chose an 18" because it's still maneuverable and still delivers.. I guess if I only wanted a bench gun, I could have gone with a 24", but at that point, I'd rather get a bolt gun. Still this was very interesting. Thanks for posting.
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Barrel twist debatably slows things down a bit.
The barrel cut down article referred to a bolt gun barrel using a 1/12 twist and light bullets
The theories of barrels longer than "20" slowing down bullets depends a lot on bullet weight, powder type and barrel twist.
This is where the problem exists.
Most long barrels will have a slower twist to keep velocity up. In theory the increased velocity of the longer barrel can overcome the slow twist and still stabilize the long bullets. This can be true during warmer weather months and or higher altitudes.
Luckily the barrel manufactures who are just a phone call away know all about this stuff.
Last edited by aklaunch; 04-12-17 at 00:45.
I would have to look at my log to say for certain but the same load from a 24" bolt to a 20" AR is at or about 150fps. H4895/75 Hornady BTHP I'm certain that powder type and bullet will govern the results. I think I have data on the same guns with MK262 as well.
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