First, are you shooting over flags? If not your wasting your time. With out a way to judge wind you are shooting blindly. Most times I shot groups, I try to shoot all five shots off as fast as I can. (With consideration to changes in light, wind, and mirage.) I try not to let the barrel cool down. On a cold day I fire a few sighter shots to put heat into the barrel, before I shot a 5 shot group. On hot days I limit the amount of sighter's I fire.
Second, what is the load you trying, and what is the twist rate of the barrel? Most 6mm BR's respond well to 105 a max bullets and a stiff load of varget powder. It may as well be that the gun don't like the load you shooting. Have you checked consitrisity of your brass? Is it alway the third shot? Segregate the flier brass away from the others and see if that helps. The question is just too vague more information is needed to truly diagnose the problem.
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