Depending on how you pattern, you might not be too far off. I pattern to see pellets in the brain and spine, meat shots dont count, and I pattern at an honest 40 yards, +/- 2 inches. Im shooting a Trulock 660 non ported in my SBE II, the best I have so far is 9 pellets from a Winchester 3 1/2 2oz copper #6 Supreme's.
Check your POI.
Start at 15, 20, 30, and 40 yards. Work your way back.
I have come to understand those TV Miracle 65 yards shots are BS, not realistic, and unethical.