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Post by skydiver on Jun 21, 2011 10:34:54 GMT -8
I just purchased a Black Hole barreled upper in .223 with a 1 in 8 twist.
What are the best bullet weights for this poly twist?
blue skies!
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Post by GLSHOOTER on Jun 21, 2011 13:05:40 GMT -8
I just purchased a Black Hole barreled upper in .223 with a 1 in 8 twist. What are the best bullet weights for this poly twist? blue skies! It should shoot anything you can stuff in it. The 1:8 will usually handle the 77's without an issue. If you go much above that you may have problems. It should shoot 55's pretty well though it may be a bit fast for 40's and 50's. It should shine at 62+ grains and should drive tacks with the 69 grain Sierra MK's. Being poly rifled it will tend to shoot a bit faster than a similar load in a normally rifled barrel. Greg |
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Post by toolsofthetrade on Jun 21, 2011 13:07:23 GMT -8
I'm sure others will chime in here soon, but from what I gather fro 50/55 gr up to about 77 or 80. Better question is what do you want to do with it and what ranges are you going to be shooting?
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Post by inferno333 on Jun 26, 2011 7:35:47 GMT -8
Is there a basic breakdown of what twist works with which bullet weights?
1-7
1-8
1-9
This would be for my 14.5" barrel build.
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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Post by dr69er on Jun 26, 2011 17:51:51 GMT -8
Twist rate has to do more w/ bullet length and a bit less
w/ weight...for the .223 Rem/5.56 NATO the twist rate to
weight ratio looks like this:
1:7 Twist -- Up To 90 grains
1:8 Twist -- " " 77 grains
1:9 Twist -- " " 69 grains
The above bullet weights are generally long for caliber in the .223
and tend to be LD/VLD bullets like the Sierra SMKS and Bergers.
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Post by inferno333 on Jun 26, 2011 22:49:09 GMT -8
Thanks for that!
It's exactly what I needed.
1-8 is a dandy form me.
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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Post by dr69er on Jun 27, 2011 7:05:41 GMT -8
Thanks for that! It's exactly what I needed. 1-8 is a dandy form me. Anytime, good luck w/ your BHW barrel...very good choice. |
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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Post by dr69er on Jun 27, 2011 19:26:50 GMT -8
I just purchased a Black Hole barreled upper in .223 with a 1 in 8 twist. What are the best bullet weights for this poly twist? blue skies! Just about anything from 55 grains to 77 grains should work well in the .223 Rem. The only type of bullet the Poly bores have trouble w/ are cast lead bullets. |
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Post by pixeljockey50 on Jul 30, 2011 19:44:16 GMT -8
I'm considering the .264, do you have a recommended bullet weight? 20" barrel if that matters.
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