Hello guys. I just got two tins of JSB 18.1's for $40. I shot and shot, re-pumping my marauder four times in one day, but I couldn't get these pellets to shoot well. I know it's not me, because I've shot 1/2 inch groups at 55 yards with Crosman Premiers. I could get maybe two or three pellets through the exact same hole on the target, but the rest of my 5 shot groups were everywhere. I thought maybe my Crosman barrel didn't like the pellets. But they cost $40! I can't waist them. I thought maybe if I got a LW barrel for my Marauder, it would shoot better altogether. Has anyone tried this? Thanks!