heavy

I currently have a CZ 550 Varmint in 22-250. It is starting to get to then end of its life. I want to keep it as a 22-250, but wan tot go to the heavy's instead of 40-50 grs (currant rifle is 1:14). I was thinking of going to a Bartlin 1:7 so that I can play with the 80-90's that are out and...