Thanks you guys I appreciate your input. Yes I did clean the barrel before testing/tuning. I used a method I read here somewhere with a weed eater cord, sharpen one end melt a bulb on the other. Used old bed sheet for patches, WD-40 initially, then dry patches until clean. Also, I did check the scope mounts and clamps, all are solid. That being said, I am no fan of this scope. Talked to Pyramyd about that, they will only replace with same. I am not able to get a credit towards a new scope. I thought that amazing because at that time I could send the entire package back for refund. Anyone wants a 100 dollar CP scope for 50 bucks I'm gone. I pay for a good scope then I have zero use for the CP.Understand restrictor screw. Go with back up screw until touches. Done. Vibration on shooting might walk a screw out but not in. Still, I'm and engineer and like things mechanically sound.Also, thanks for confirmation that I should be able to get ragged hole at 25. I certainly think I should be able to get 1/4 inch. Minimum (or maximum) 3/8".Will keep you informed. Thanks again for input.Barry