[becklr1]

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.

 

[becklr1]

Laugh... why? He asked for experiences. All I was doing was relating my experience with the spring. If based on that you can determine it would not be feasible with a .20 then there you have it.