Being a 222 Rem fan for a long time. I would look at some heavier flat base target bullets. The 222 earned it's bones with 52gr bullets. Over the past couple years I shot in a couple postal BR matches with a Shaw barreled Savage 10 five shot targets with no mulligans or tossing out a target. I shot a .800 aggregate with Speer 52gr Varmint bullets. I'm happy
It looks like your dealing with some horizontal spread. A good solid bench and rest plus a good rear bag might help. Reading the wind on your range some spaced wind flags so you can read the wind. Also annealing brass so you have the same neck tension.
Also making sure your head is always the same on the stock to help with any parallax problems you might have with the scope. Having to move your head to find the crosshairs will mess with your groups.
