Thank you everyone...this is all great feedback...notnsure why I am sweating it as the rifle shoots lights out with the 77gr SMKs over 23.3gr Varget seated at 2.26. I just want to start start playing with seating depth. Most likely I will attempt what is suggested above and see what I get.

I was fire-forming some new Starline .223 brass this weekend using some powder (H335) and bullets (Hornady 60gr VMax & Sierra 55gr SBT that I don't favor and was suprised how well the flat based Hornadys shot at 100 out of the 1:7 twist. The 55gr Sierras did much worse