I've owned a couple of PBBA rifles and the 20 gauge shotgun the shotgun had a long or short insert that shot slugs quite accurately, the rifles I had were 308 and 457 they weren't ammo picky but I like shooting liter slugs for flatter trajectories very well made and Terry Tate the owner is a great guy to talk to I had a leak in the 308 once called Terry and he stayed on the phone with an explained what oring and how to change so he has great customer service, only down to these rifles for me was the heavy laminated stocks their beautiful but heavy, hope this is helpful. I liked the 250gr to 300gr in my 457 I used my cast bullets also shot NSA and Mr Hollowpoint with good accuracy.