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I have just purchased an AR with a 1:7 twist. When I look at the recipes in my reloading manuals they state they are using a 1:12 twist. Does the difference in twist effect the amount of powder I use? Are there any other differences? I would like to work up a load for my rifle.
Thanks.
FWIW, it's not the weight of the bullet that determines what twist rate it needs. It's the aspect ratio - ratio of width to length. Since all .223 are (duh) the same width, then it's only the length that matters.
One more time. Weight is irrelevant. The reason the military went to 1:7 is because the relatively light weight but very long tracer bullets have the highest aspect ratio of all, and that quick twist is needed for them. Otherwise, the nice compromise 1:9 works well for just about all common rounds. I said common, LOL.
I wouldn't buy a 1:7 personally because I don't ever expect to see a tracer, and it's way too fast a spin for an M193 for optimum accuracy at distance. The very fast and short bullet might tumble or it might break in flight, or both.
Check it out
http://www.downrange.tv/blog/mossberg%C2%AE-mvp-series-of-bolt-action-rifles-introduced-at-nra-convention/9530/
Lots of shooters are re-barreling their "common" bolt guns with 1:7 twist rate barrels specifically for the heavier bullets available.
It was just introduced at the NRA Convention and I predict that in short order it will become very common. Half the price of some of big names out there and a 10 round mag standard. They're supposed to start showing up this summer.
I think I'll start re-arranging my safe and "make a hole" for one.