If your using 110 gr 777 now, then start out with 110 gr BH209 and see what kind of groups you get. you can always experiment up or down.i have shot up to 40 rds with no BP cleaning with a drill bit.if your worried about accuracy, give the BP a twirl with the bit, about every 10 rds..you will never look back at 777, once you use BH209..Ray