First time playing with subsonics in the 300 blackout SBR 10.5" 1:7 Noveske and TBAC 30p-1 at 900 asl. I developed the load in the winter which was 10.9g of 5744 under a 220 SMK and was running 1060 with a 8 fps spread. Started noticing a crack so I ran them through the chrono today at 1120 with a 9 fps spread.
Would it be normal to gain 60 fps from 40 to 80 degrees?
Would it be from the 5744, not sure on it's temperature stability?