Well, I found out something today. Had a brick of Eley 40gr. roundnose std. velocity (Sport/Target) given to me and tried it out in a couple guns. Works fine in my old Savage 6a, but doesn't feed reliably in my Sig 1911-22. Not enough oomph to work the Sig slide all the way back to pick up the next round. I suspect it would be the same in other .22 semiauto pistols, especially the GSG which is a twin of the Sig.