I also have a omega with nikon bdc 250 scope and I use three 777 pellets with 250 grain shockwave bullets. Anything out to about 275 is mine. I blew the heart out of a doe last year at 90 yards. Not much blood trail but I didn't need one because she only went about 15 yards. Those bullets hit really hard and cause a lot of damage. If you read the instructions for the nikon omega scope it recommends using 3 pellets because that is what they tested the bdc circles with, so that is what I use.