Thanks for all the replies so far. So I got my dies in and decided to give h4350 a try with 90 gr gamechangers. Win brass and fed210. Iv got a few starter rounds to check velocities but I'm have a hard time deciding my COL. I left my bullets way out to seat later. This is my first time to load seirra anything so I dont have that manual. Anyone got a manual with 243 90 gr gamechangers? If so what is recommended COL?