There is no desired velocity I'm trying to see why this gentleman's rifle shoots 3-in patterns that's why I was asking for loads that y'all thought would be accurate in most rifles and pressure wise for sure. I'd be really surprised if any of these loads top 2750. But we won't know until I pull the trigger.
I wrote this last night and I guess I didn't post reply
I might as well add this morning's results to it.
We had a storm rolling in so I shot these loads in four shot groups with approximately 8 to 10 minutes between strings. It was pretty hot this morning temperature in the high 70s feels like was 88°.
This was all an accuracy evaluation of this Christensen Arms Mesa 308 with a 20-in barrel the kids said it wouldn't shoot and he gave me two boxes of cheapy ammo I didn't even take it to the grove this morning.
Brass used was FC and fiocchi primers we're also used.
First up was 42 grains of IMR 4895 under a 175 TMK. Average velocity for the load was 2560 extreme spread was 30. no crimp was used on these. The bullets were loaded with .007 jump. First two shots were fired without the small o-ring applied for pressure at the end of the barrel. that group was an 1 3/8 then I applied the smaller of the two diameter O-rings for tip pressure and shot two more that group was an 1 1/8.
Next up was the 8 150 power hammers with a 1/2 FCD in the top Valley. four of these were loaded with 42 grains of Benchmark. Average velocity was 2,760 with extreme spread of 19. Other than the first shot being high to the right opening the group up to inch and 3/4 the other three landed in a nice 1-in group. just wondering if the Moly off the 175 tmks might have affected the first shot? this load was also shot with the small diameter o-ring approximately 1.5 in from the end of the four end.
Pic of both Orings.
Next up was Tac. This load was shot with a large diameter O-ring for tip pressure. it had an average velocity for four shots of 2700 with an extreme spread of 22. This load shot the best with a inch and a half group and the first three being in 3/4 of an inch.
I don't think this rifle shot too bad for the first time out considering I shot it hot and I experimented with tip pressure I'm going to hand it back to Chad and tell him to buy some premium bullets.
Thanks for the suggestion fellas I appreciate it, Chad does too
This place is awesome
Joe