Very interesting observation. Mike, are the .22 B-26 barrels generallytighter in the breech area ? I also have a couple tins of the Beeman perfect rounds in .177 from a few years ago. Mostly they will just roll out the barrel or roll in to far in the breech of guns I've tried them in. They don't recomend these for springers, but I do have one .177 QB-57 with a tight breech , that they will work in. They give me 1" groups at 10 to 15 yards. Also have been using them up in the Crosman 357 CO2 revolver. I've been meaning to try the .22 Gamo rounds in the 2240's, and Benji 392 now that they have become available again. A poster over on the Green forum posted that he uses them with good results out to twenty -five yards. If they made the .177 rounds the same size as the original lead BBs , .175 dia. , instead of .173, they would seal better and work in more guns. They also seem to me to be really expensive for what they are. Almost bought a CO2 Shark pump in .22. That would make a super rat buster!