You're too Hot
Had the same problem with my Omega. I was shooting 250 Shockwaves with 110 of T7 with no consistency.
I went to a 300 gn. bullet. and down to 100gns of T7. and started to group very well. ( 1725 FPS by the way )
If you're using a 240 grn bullet, try about 85 grns of T7. It's still plenty of power and will be on target.