Ah now the fun begins-different powder charges, primers, powders, bullets, seating depths, yadda yadda yadda. It is enough to make a person dizzy. When I had my .223- a Ruger M77 MK II, 50 and 55 grain Remington Core Lokt hollow points always shot real well and they are cheap, and that is a definate plus! :grin: Midawa USA stocks them. Also might want to try Winchester 748 as well as Hogdon BL(C)-2 powder.
Have fun- it is a wonderful puzzle, and when you find the solution, the results are cool!
Scott.