Unfortunately, you can not assume good groups at 50 (or 60) yards translates to good groups at 100 yards. I have a T/C Encore 209x50 that would group most bullets OK at 50 yards, but not consistently hit a 4' x 4' target holder at 100 yards! I finally discovered Precision Rifle Muzzleloading Bullets and my gun handles their 300 and 330 gr. bullets and similar weight bullets from other sources quite well. Lighter bullets just would not shoot well in my gun. OK to test loads at 60 yards, but you better shoot some at 100 yards before you hunt.