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The black mountain is 26" and 13" twist
The twist rate has no real effect on the powder charge at low velocity
I tried 7.5 grs of AS30 yesterday velocity was still at 1200 fps with ES 39 SD 11...

I have both Red dot and AS30 their denstiny and burn rate are very similar, I am using up the AS30 first and then compare results with Red dot as I have more Red dot and don't want to waste it
doing...

I tried 8.0 grains of AS30 with my 151HP yesterday velocity was 1275fps average for 10 shots accuracy was not great but the rifle I used is not a cast bullet fan
The stats are quite good ES 29fps...