08-13-2023, 11:36 PM
LRRPF52 Wrote:It will do 2410fps from 18 barrels using CFE223 and still be around 50,000psi, depending on your chamber.
It expands down to 1300fps, which is well beyond what anyone would use it for, other than an inexperienced hunter throwing a Hail Mary shot at extreme distance they shouldnt be attempting.
At 2300fps mv, it will maintain 900ft-lbs to 400yds with ~1776fps impact speed.
Use a VLD-seating stem and double-seat them, with a half-seat initially, rotate the cartridge in the shell holder, then fully-seat. It will tighten up concentricity and shrink the groups a little.
If you use magazines that allow longer COL, you can seat them out a bit and get a little more wiggle-room with your charge weights. Nothing crazy, but it might allow you to find the accuracy youre looking for with some more velocity.
Yes, I may eventually go back to the well on loads, but temperature stability is important to me. CFE223 is a no-no when I might take a shot at 80F baking in the sun, or at 10F in the snow. I decided to play with H4895 and TAC because they are extremely (H4895) and fairly (TAC) temp stable. I eventually need to fool with this bullet in my Ruger Amer Predator to see what it can really do, but I am running out of time before Fall closes in. At this point, my choices for known good hunting loads for the 18" AR are a 123SST/H335 load that does 2363 FPS or the ABLR load. It appears that they are near ballistic twins down range.