custom rifle won't shoot cold. Let me start by explaining I just had a rifle rebarreled Bat action custom barrel rifle shot very well in previous barrel 6.5x284 (just burned out) rechambered in 284 now it won't shoot unless you have 7 to 8 rounds fired then it starts to shoot excellent goes from a 1" group to a 1/4" or less group with same load but only after 7-8 rounds to heat it up, have done this several times with same results. tried it with a fouled barrel doesn't matter. If I shoot 7 rounds then shoot a three shot group the three shot group is always excellent, if I do this and let the barrel cool it goes back to about an 1". myself and friends have some ideas but the custom barrel company tells me they highly doubt it. Would like some other opinions and see what the consensus is.