I have been playing around with my .177 Titan I got back from a friend's son. It twangs a lot more now than before he got it. I'm trying to see which pellets shoot the best and I tried several pellets in the 8.4 gr range. Then I tried CP Ultra Magnum 10.5 gr - the twang was gone but with a tad more kick. Can anybody explain why and whether I should or should not be using these pellets? Thanks! Terry