I have been loading the hornady 180gn BTSP interlocks. I just cant seem to get good performance from them. I load to sami oal. With retumbo, starting from 91 gn's to 96.5 gn's. In .5 gn steps. best I have gotten is .75 groups. This is a hunting rifle, but I want to be comfortable out long, with it. I do want to keep my ammo in my magazine. Maybe I should step it up to 200gn bullet? Different brand? Maybe different loading technique? Or keep pushing up on my powder? I have not had any pressure issues yet. Rifle is a pretty much stock browning Abolt, with the addition of a after market muzzle brake. and a timney spring kit. Any suggestions would be appreciated.