AKJC1977 here, I have a Gamo, Viper .177 cal, Anyway I have been on that long mission of trying to find that perfect pellet for the viper. I have the best groups with crosman,hunting 7.9 and Skenco goldenrod 8.5 but I had figured the Crosman,premier 7.9 pointed would be the one. Since they are basically the same as hunting 7.9's, but more uniform in tolerance. The problem is they seem awful tight in my breech, I have never had any pellet that fit that way in it. I mean they are not extremely tight,but ya have to put a good bit of pressure on them to get em in. And if ya dont use something flat to do it they tend to not be straight. Is this meant to be so the pellet will follow the rifling better? Because I notice a lot of drop between the premier and the same weight and design hunting,and they tend to shoot far to the left also. I had considered trying to take some fine steel wool and resize them,since I ordered two 500pc tins of them. I know just enuff bout airguns to make me stupid sometimes! HA HA. I fear though that the tight fit is putting too much back pressure on the spring and seals. How can we gauge what is too tight? and how to measure that size? I guess a drop of 1 foot at 10 yards is a pretty good indicator that I should not use them? AKJC1977