I think half inch should be the minimum accuracy sought from a custom build mate. It is experience and personal preference as to what individuals will be satisfied with. Bedding is IMO way more important than running in a barrel. I have never ever run a barrel in like what is considered conventional. Only had my first new custom barrel that would not shoot just recently, out of many. Never had any issues prior to that barrel at all.
If a barrel is going to shoot, it will from the start in my experience.
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