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Post by eddie56 on Dec 29, 2012 8:57:29 GMT -8
I no its said not to run cast bullets in an AR15 but I'm a die hard caster.I have also been told not to run cast in a polygonal rifle bore.What do you think?I would really like to give it a try.But figured I better ask people that know more than myself before I get into a mess.Thanks for any help you may have.
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texcl
Junior Member
Posts: 19
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Post by texcl on Dec 29, 2012 9:19:01 GMT -8
I think the bigger problem is twist rate and leading of the gas system. polyagonal rifling has been around since the black powder era where all bullets were lead.
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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Post by dr69er on Dec 30, 2012 2:30:35 GMT -8
Typically cast lead rounds don't work well in a poly gassed rifle barrel like in the AR-15 platform with direct gas impingment.
Chances are you will lead-up the gas tube (and other parts) after a while, even when using gas checks on the bases of your projectiles when driving projectiles at typical rifle speeds.
Although, that does not mean you can't give It a try with hard cast projectiles and using gas checks etc.
I only have had experience with cast lead in pistol calibers though....
Good Luck. YMMV.
Perhaps Carl or Ritch can chime with their experience on the subject at hand with a more definitive answer...
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Post by m4weave on Jan 1, 2013 8:33:42 GMT -8
Although I cannot state from personal experience and it is not specific to the 5.56, I have read of those who successfully use heavy cast projectiles for their 300 blackout builds. Though, I am not sure if I read about that for conventional rifling or poly...
Sorry I cannot help more, though I am interested if you do venture into lead bullets for the 5.56.
Regards, -Mike
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Post by GLSHOOTER on Jan 1, 2013 10:44:17 GMT -8
I think getting the pressure up will be an issue with lead in the poly rifling. The usable velocites will be pretty low. Better a 22 Mag than the 223 platform IMHO.
Greg
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