I am handloading for a 7mm Rem mag. using Rem. brass, Federal 215 magnum primers, Reloader 22 and Sierra 168 grain HPBT Match bullets. I am seating the bullets 10/1000ths off the lands, which is a COL of 3.305" in my gun, and neck sizing only. The best 5 shot 100 yd. group which I have been able to achieve is 0.68" and I feel the gun should do better. The gun is a Remington 700 synthetic with a 24" hunting weight barrel. Any suggestions as to different components/techniques which might help to shrink the group sizes?