I spent sunday morning at the range with my 270 win. I loaded up some 150g sst's with RL-22 and H-4831sc. Both powders have proven accurate with a couple other loads, so I figured I would stay around 56.5g-57.5g and go up in .3g. My OAL was 3.430", I used Win cases, and CCI 250's. The column on the left represents RL-22, 56.6g-57.5g. The middle column is H-4831sc, and I only shot 56.6g and 56.9g as that was a pretty horrible group. Velocities were as follows, starting with RL-22 and the top group of 56.6g. I did 4 shot groups. Very little wind, 100 yards, about 80-95degres.
group 1- 2957,2972,2983,2948 4th shot did not hit target???
group 2- 2961,2967,2968,2997 4th shot was the high flyer?
group 3- 2970,2972,2995,3004
group 4- 3010 3014,2972,3032
sidenote- at 57.2g, bolt was little harder to lift, plus there were shiny spot on the head of the case. So I'm thinking I'm running them to hot and thats whats causing the horrible accuracy. Keep in mind however, I'm shooting 57.5g Rl-22 or 4831sc with the 150g gameking and it shoots great, max load as well. Now for the H-4831sc velocity.
group 1- 2934,2889,2932,2909 4th was the high flyer, hot signs as well
group 2- 2948,2957,2931 3 shot group of 6 inches at 100 yards, think i'll stop there, pretty hot load
sidenote- I'm thinking the same thing with this powder. I'm thinking I need to back down and see what happens. I know the rifle will shoot the SST's, it shot the 140g SST THE BEST out of any bullet i've put through it so far, to bad I only had 20 bullets, so that gave an itch to try something else. Anyways, I would like comments or opinions/suggestions.