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Gunsmithing Caliber change for a 6mm Intl "Across the Course" rifle

Not sure about the International, but GA Precison lists the 6-250 on their reamer list. I had a 6-250 and it was wonderfully accurate, but had a tight neck and I hate neck turning.

GAP has a turnaround of 2 months for rebarreling and 6 months for complete builds if you provide all parts.