Has anyone experienced any problems with remington's core lockt? My personal experience was NEVER being able to shot a group at 100 yards smaller than a pie plate with my 700 bdl 30-06. I struggled, thinking it's me, I'm jerking when shooting or something. After three boxes i still couldn't hold a group. Yesterday I went outwith a box of federal premium and no lie shot a group the size of a quarter at100 yards. I changed nothing but the ammo. I let the barrel cool down and repeated my group. Has anyone else had a problem or do some bullets work better than others for that particular gun?