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I have a barrel indicated in the lathe. running less then .0002 off the ID of the bore. The OD of the barrel is about .025 out. Thats quite a bit more then Ive come across. Have you guys seen barrel this bad?
I have seen several factory barrels that were that bad or worse.
They were either barrels that were significantly shortened, or barrels that I was cutting up to make thread protectors.
I believe this is a big cause of shifting POI as a barrel heats and cools.
Its really not supprising if you think about it. Drilling a 30" long hole (30"blank) the drill is going to walk some. Also the blank is going to have some runout itself depending on what length blanks they use. So is the run out in the bore or the blank itself? I dont think the barrel manufactures would indicate the bore of the barrel in then turn the contour. If that would even be posible to get the bore and od parallel the whole length of the blank. Just my thoughts
Years ago i got a 30" 6.5 full unturned blank from a major maker and cut it in half to make 2 XP-100 barrels, it was .067 out in the center. Turned both true from center and chambered. Both barrels still shoot 1/3 MOA.