Ok, I have a load shooting 96 gr IMR 4350 w/ 260 accubond w/rem9.5M primer. Shoots less than 1.5in consistently and sometimes better. Velocity it 2950 @ 15ft. I have some RL17 that I'd like to try. I was thinking going back to starting load data for IMR 4350 and then starting with rl 17 2 grs lower--which would put me at a starting load at 90 grs. I'd switch over to FED 215M primer also. Then work up load looking at velocity, accuracy, pressure, etc. I don't want to start out with too much of a charge with the rl 17. Any opinions on a good starting point with this powder in the 375 Ultra? I don't think there's any data for the 375 ultra using it.
