July 27, 2009, 01:40 PM | #1 |
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reloading & barrel twist
So I'm just about ready to start reloading thanks to all the good advice I got here.
I want to reload .223 using 62 grain bullets, but when I read the speer manual it tells me that the loads are for 1-10 twist barrel or higher. Currently, the twist on my m4 is 1-9 I thought I could go as high as 68 grains. Should I worry??? |
July 27, 2009, 02:02 PM | #2 |
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1-9 is faster than 1-10. I have a 1-12 FNMI on my AR15, it cannot shoot bullets heavier than 62 grains reliably (and it really just likes 55 grain). With 1-9 twist you can definitely shoot 62 grain and higher, I'm just not sure how high you can go because I have never has a rifle wit ha twist that fast (my mini-14 is also 1-12).
1-9 means that the bullet will make one full rotation every 9 inches. 1-12 means it takes 3 more inches to get a full rotation. Heavier bullets need faster twist to stabilize in flight. |
July 27, 2009, 02:08 PM | #3 |
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Hey swampyankee thanks I guess I had it backwards ...
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July 27, 2009, 06:01 PM | #4 |
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According to the twist rate charts from several barrel makers, the 9 twist is ideal for 68-75 gr bullets. Which means that it should shoot bullet weight just up and down from that with good accuracy.
There are some 9 twist barrels that will stabilize a 55 gr, not great accuracy but respectable. You should try a variety of weights to see what your's will handle.
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