Really appreciate the ideas! I'll run it up a half grain at a time and watch pressure. I have a TON of 22 and a couple pounds of 23 - May see what happens there if I don't get anywhere with 19. I use 4350 in my 7-08 - Pretty sure I used it with my first loads in this .280, prior to having a chrono. Might not hurt to go back and try it also.
