I have been shooting 308 and I have got it down to three shots in one hole at 100 yd. Now my friends have changed to 6 mm CM so I have gotten out my old 6 mm Rem to shoot with them. I have always used Sie 85 gr. HPBT with this rifle and it has worked great in 100 yd. shooting. We have extended the range to 500 yd. and my friends have changed to heavy bullets over 100 gr. I don't want to be left out or buy up a lot of bullets I want use. The question is, has anyone got any idea or have used the 6 mm Rem for 500 yd. or farther, and if so what bullet and powder worked best?