I just picked up my T/C omega. 50 cal. I understand I need to work on a load to get a good group. My question is "If I get a good tight group at 100 yards with approx. 100 grains or 2 pellets and it stays tight at 200 yards is this enough energy with the 2 pellets or 100 grains to make a clean kill that far, or will I need to go with 3 pellets or 150 grains ?