HA! That makes me laugh. Have you ever been to a field? You can't just throw in heavier bb's and you're set. You chrono with .20g's, always.BeckLR1 said:Yep I do, tested a crap load of them including the SS models. That SPR250 will get you to 470 with a .32 bb. With a .28 it should get you right where you want. My test rifle was a fully hopped up VSR all PDI.