Just try it to see. I have a 9 twist that shoots anything from 45's to 77's. My son has an identical gun, same brand, same barrel length, same twist, but it won't shoot 77's. All barrels are a little different so you just have to try. My wife has a 7 twist that shoots 55's fine but my 7 twist won't. See what I'm gettin' at? Try it, you may be surprised.