What is the minimum extreme spread and maximum standard deviation that you guys look for in a keeper load? I have a load that shoots 2 inch groups at 500 yards, but has a high SD, 17 to be exact. This load would be great if it wasnt 55gr Nosler BTs at 4300fps. They dont have the stomp past 400 yards and they are going to ruin my throat. Ive been doin all I can to get my 107 MKs to shoot good, the SDs are a lot lower, 7-10, and groups are in the 3.5-4.0 inch range at 500. The BTs are easy to hit hogs with, but they dont kill very good past 350 yards, usually requiring several shots. Ive managed to hit a few hogs with the MKs past 350 yards and they act more like a bomb going off. The rifle is a 6mm remington ackley, 700s action, mcmillan a-4 stock, shilen 2 ounce trigger, shilen 1.25" straght cylinder 28 inch select match 1-8" barrel, Mark 4 rings and bases, and a 8.5-25*50mm Leupold scope. Any suggestions would be greatly appreciated.