I have a .25-06 Encore, 15". I use IMR 4831 powder with no problems. I've taken deer and groundhogs with 85 gr.BT,100gr. BT, 100 gr. Hornady SP, 100 gr. TSX, 110 gr. Nosler ABs, 100 gr. Nosler PT, 120 gr. Nosler PT, and 90 gr. Sierra HPs. The best performance has been 100 gr. BT and 100 gr. PT.