I tried using the Remington Kleenbore primers with the T7 pellets and it did not leave a hard crud ring! My point of impact also changed, which I will correct the next timeat the range. I shot 3 shots without cleaning at 50 yrds and the first two shots were touching and the third was an inch away. At 100yrds I put three shots within a three inch circle. They were just 4inches high and 4 inches to the right. I now have a combo that I'm comfortable to hunt with. Thanks for the input.