Re: 7 saum unexpected velocity
I think i am getting closer to finding my rifles happy place. I set up today with the chrony at 10ft from the muzzle. I brought my 6 dasher as a baseline for the chrony speeds. It shot a nice little ragged hole with velocity for 5 shots being 3083,3086,3097,3071,and 3068. This is normal for this gun and the jbm trajetory matches these numbers well.
Now for the 7saum.i loaded 5 180 vlds at the original 54.5 grains of h4350 and the velocitys were 3057,3000,3093,3123,and 3118. These produced a 100 yd group around 3/4".
I also loaded 5 180 vlds with 52.5 grains of h4350. The velocitys came in at 2941,2923,2917,2919,2953. This produced a 3/8 inch ragged hole a 100 yds. Extreme spread of 36. I had 5 more rounds at 52 grains with almost identical results.
This seems like a lot of speed for 52.5 grains of powder but if the trajetory matches it i guess that will be ok.
Would you guys accept an extreme spread of 36 or change primers or any other tricks to lower the extreme spread? Accuracy seems to be good here. I really dont want to wear this barrel out before i get it tuned.