Stock up ammo 5.56
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Old 04-22-2012, 12:36 AM   #1
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Default Stock up ammo 5.56

WHat would be a good bullet weight to have stocked up in case you ever need it for rifles with a 1:7 and a 1:9 twist 5.56 223 one round that will shoot good in both. I'm thinking 69 grain what's your thoughts?

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Old 04-22-2012, 12:39 AM   #2
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You looking for a midrange grain that works well in both, or separate? I think I'd opt for one that works well in both calibers, because you're not talking a major variance in twist rate. The 1:7 is obviously faster, but somewhere in the 60 category would work well.

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Old 04-22-2012, 12:46 AM   #3
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55gr or 62gr will work equally well and should be abundant in bulk at reasonable prices...at least for now.

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Old 04-22-2012, 04:57 AM   #4
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55gr or 62gr will work equally well and should be abundant in bulk at reasonable prices...at least for now.
I agree, 55-62gr should be optimal for most 1:7 and 1:9 ARs. And reasonably priced.
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Old 04-22-2012, 05:07 AM   #5
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What about a 1:8 twist?

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Old 04-22-2012, 06:23 AM   #6
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What about a 1:8 twist?
No difference. For all practical purposes, 1:7, 1:8 and 1:9 will all perform more or less the same with 55-62gr ammo. Unless you are shooting extreme distance with longer, i.e. heavier loads or heavy tracer rounds, there is nothing gained between a 1:7 and a 1:9. Lighter, varmint rounds in the 40gr or so range may need a 1:9 or 1:12 to prevent overspin.
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Old 04-22-2012, 02:54 PM   #7
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Here is something that may help your decision out.

http://kwk.us/twist.html

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Old 04-22-2012, 03:51 PM   #8
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Quote:
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Here is something that may help your decision out.

http://kwk.us/twist.html
What a great link! Thanks for posting
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Old 04-22-2012, 04:03 PM   #9
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Your going to have to shoot both 55 and 62 gr and see how they shoot out of your guns , both of mine will shoot 55 but one of them is not as accurate with it and both barrels are 1:7 both by the same manufacturer , they both shoot 62 about the same and much better than the 55 gr . just buy a couple boxes of each and try them out yourself .

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Old 04-22-2012, 04:15 PM   #10
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Your going to have to shoot both 55 and 62 gr and see how they shoot out of your guns , both of mine will shoot 55 but one of them is not as accurate with it and both barrels are 1:7 both by the same manufacturer , they both shoot 62 about the same and much better than the 55 gr . just buy a couple boxes of each and try them out yourself .
If both your barrels are chrome lined, that could have something to do with it, as chrome doesn't make a perfect bond, and thus, each barrel will be different. Thus, shooting a lighter 55 grain will give different results than shooting the heavier 62 grain bullet. Another thing would be what ranges do the differences become quite apparent?
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