RL15 velocity ladder test to find max pressure.
Privi Brass, Fed 215 LRM primers, 300 grain Peregrine copper solids (VRG-2), OAL 3.520 inches:
66.0 2516 ft/s
66.5 2514 ft/s
67.0 2527 ft/s
67.5 2528 ft/s
68.0 2592 ft/s (significant velocity jump with only .5 gr additional powder ?)
68.5 2562 ft/s (wondering if the 68.0 & 68.5 loads were shot out of order as the velocity is much lower)
69.0 2594 ft/s
69.5 2590 ft/s
70.0 2600 ft/s (adding additional powder but velocity is topped out, primers showing signs of pressure)
The target didn't make any sense as the shots were dispersed vertically but were mixed. Hmmm.
Went out yesterday and took one shot with the 300 gr Hydros and the shot was much lower than it should have been. Stopped shooting and checked out the rifle at home. I was able to turn the rear tang action screw more than half a turn before hitting 40 in lbs with torque wrench. Hoping I found the problem and the scope isn't acting up, a little blue Loctite on the action screws to keep things in order.
Back to the range again soon, will shoot 3 rounds of the RL15 at 67.3 grains as there seemed to be a node there as well as the RL17 load of 72 grains with the VRG-3 Bushmaster (expanding point).
You need to be the judge of what's happening here. But 2600fps with those long copper solids.....were it me, I'd be concerned I'm reaching the line of max safe pressure if I hadn't crossed it already.