I'm new to the forum but I've looked at many of the crimping threads.
I'm loading the 250FTX with 37.0 Lil Gun. I've also tried 35.1. 2.225 COL with both Starline and Hornady brass.
Before the forum, I could not find crimp data. So, I went by a diagram that showed .480 and it cycled and functioned fine.
But, with the Hornady Black ammo - I could get 1" to 2" @ 100 Yds with a sandbag, 4x scope, 16" Bushmaster with Bowers suppressor.
My loads would hit the 1" target circle, then go 6" or more off in random directions. Usually high - but left or right. Finally, I measured the crimp on the factory and found it at .477 - then read in these forums suggestions of .473 to .475.
I only had a few projectiles to load some more at .477 and have not had a chance to test them yet.
My question is if anyone has tested grouping at various crimp measurements and if it made a difference. Am I an on the right track?
PS I've also used H110 and had the same issue - that's why I switched back to Lil Gun