OK, you got my attention. I guess I'll have to tune and power mod my QBs and try Crow Mags, Kodiaks, and even Eun Jins in them. I have a box of the Crosman Premier Heavies(10.5gr RN0, that I got from a pawn shop for 10 bucks out the door. They had had them for about 7 years and they never sold. Then I spotted them, looking sad and lonely on that shelf, along with a box of the .22 premiers, and took them both home with me. Great shooting pellets. I almost hate to shoot them because I can never get that kind of deal on them again.
My pneumatics, both pumpers and PCP, seem to prefer the heavy slugs also. My Benji/Sheri 392 loves the superdomes, cro-mags, kodiaks, and eun jins. It hits HARD with the eun jins.