I bought one of these years ago for my dad and shot it the other day for the first time. Well It didn't shoot for beans. I have a hawkin and am experienced shooting flinters so flinching isn't an issue. My question is would a power belt or sabot make a difference versus a PRB. Are these safe in the older models. It has a 1:48 twist. We started low charge, then progressed and that didn't work either.Thanks in advance for your help.