My .17 rem is a rifle. I do not think moly will be much help IF any. I tried it in a couple larger calibers (6 & 7mm) and did not find it to help. You have to "season" the bore before any improvements show up. By that time you have to clean the bore and start all over again. I did loose a few FPS when I started using moly, after I increased powder charges a couple tenths of a grain ,I got back the lost FPS. But that put me on the edge of MAX loads. Accuracy was not all that great with moly either,I was getting the same size groups with out it!?