Well I put the X7 up for a bit while I got married and built an AR pistol for kicks. So after free floating the barrel I finally prepared myself for a day of frustration at the range. I set my Simmons WTC scope to factory zero, set up at 25 yards, and sent my first round down range. First hit four inches low and right on center. HOT D&MN! I backed up to 50 yards moved my elevation up 6 clicks (1.5 MOA) and tried again. Second hit 2.5" low and 0.5" right. Ok, I'm still doing good. Stepped back to 100 with no adjustment and fired away. Elevation was "dead nuts" and I was about 3" right. Adjusted windage 3 MOA, shot number 4 hit 1" left of center, but I may have pulled it a touch. So two clicks right and BANG dead center bullseye! I COULDN'T BE HAPPIER!
Now the best group I pulled on factory ammo was about 2.5 MOA. I went ahead and shot up what I had on hand. Then tried some "stab in the dark" reloads I made 150gr Sierra Matchkings loaded with Reloader-15 at 36.8gr, 37.1gr, 37.4gr, 37.7gr, and 38.0gr. I got my best results (still only about 1.5 MOA) with the 38.0gr. I'm going to test from 38.3gr-39.5gr of RL-15 next. I also have some Hornady 154gr pills to try and some Sierra 140gr MKs. Aside from Varget since its impossible to find, and any I can get is dedicated to one if my ARs what powders have people tried? Also what bullet weights I'd like to make the 150s or 154s work since my 7mmRM seems to like them as well.