Recently a friend of mine had a Legendary Arms Works rifle rebarreled from a 26 Nosler to a 28 Nosler. When he received the rifle back and we took it to the range it shot great for the first fifteen rounds then would no longer fie any more. The firing pin hits the primers and actually puts a pretty good intrusions into the primer but it does not go off. I also have a Legendary Arms rifle in 26 Nosler so we swapped bolts to see I there was an issue with the firing assembly. My bolt would not fire his rifle either. I put his bolt in my rifle and it fired just fine. We contacted the gun smith that did the rebarreling and he said that Nosler brass is slightly shorter than the SAAMI specs and that his chamber is .003 longer than the minimum spec. This could be the issue. We measure his cases with a head space comparator and they are all slightly shorter than specified but why would the first fifteen shoot and then nothing. More importantly how do you fix it? He recommended trying brass from ADG as it would probably be closer to the SAAMI specification for the cartridge. My main question is this. Should the rifle be sent back to the gunsmith and the .003 extra length be removed from the barrel so he can shoot factory ammo if he desires to or should my buddy just keep looking to find cases that will fit his chamber. Sorry I shoot a lot but I am not up to par when it comes to all of the details of precision shooting and loading and all of the jargon. If my post reads like a twelve year old wrote it I apologize. Any help or advice anyone can give would be much appreciated.