I used the 100 gr. BT's after purchasing my 257 Roberts. Over my chrony I ran them a little over 3100 fps. These bullets weren't tough enough on 140 lbs deer in Oklahoma. I switched to the Hornady 117 gr. BTSP at 2900 fps and put deer down with devastation. I have used the 115 gr BT's with better success at 3000 fps. In my opinion the Hornady held together better and expanded reliably. I recently received a 25-06 as a gift and have had good success with the 110 gr. Accubond on whitetails and feral hogs.