Brent: I'm going to say both, but it is certainly going to do it's best with conical bullets. This was the twist I first ordered before I was told it was better to go Round ball in my case it was for .6750 bore or aka 16 ga. the twist then had to go to 1 turn in 95".

I can give you a contact number if you would like to talk to a builder that can explain it all. I admit to being a little out of my league with this stuff.

If you still have my e-mail Addy, shoot one off to me.