03-02-2019, 07:56 PM
My calculations gave sort of a worst-case scenario, under the assumption that most Grendel shooters won't be focusing on 140-grain bullets. So, any bullet lighter than 130 grains, and any conditions that are warmer than 0°F and any altitude higher than sea level performs better and better.
Bottom line: 1:8 is probably the best compromise twist rate for Grendel barrels from 12" to 24".
If one wanted to shoot only heavy bullets, I suppose 1:7 would be best for a 12" in extreme conditions and 1:9 might be best for a 24" (which is what Bill Alexander used to do before he left Alexander Arms).
I generally subscribe to the school of thought (and I get this from ballistician Brian Litz) that—all things considered—it's best to slightly "over-stabilize" a bullet, to have a slightly tighter twist than absolutely necessary, than to swing the other way.
Bottom line: 1:8 is probably the best compromise twist rate for Grendel barrels from 12" to 24".
If one wanted to shoot only heavy bullets, I suppose 1:7 would be best for a 12" in extreme conditions and 1:9 might be best for a 24" (which is what Bill Alexander used to do before he left Alexander Arms).
I generally subscribe to the school of thought (and I get this from ballistician Brian Litz) that—all things considered—it's best to slightly "over-stabilize" a bullet, to have a slightly tighter twist than absolutely necessary, than to swing the other way.
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