Join Date: Jan 2016
Location: Shiawassee County, MI
I too would like a 7 x 57 or a 6.5 x55 TCR barrel, but six hundred would be too much for my budget. I picked up a .22 Hornet barrel, now a K Hornet, about a year ago and passed on a 22-250 barrel despite the really good price. 20-20 hindsight was that I could not have procured a donor monobloc for less.
Replacing a TCR barrel seems like it would be akin to barrel stubbing and I believe there are some stubbers here on GBO, though I don't know if they are in the business or not. There might be some pressure/load limits on a stubbed barrel due to smaller barrel tenon diameter. I suspect most stub jobs are on H&R shotgun barrels converting them to pistol or rifle cartridge. But those are one piece barrels, not monobloc and barrel.
Is your donor barrel pinned or welded in the monobloc? That might have something to do with reluctance to work on these.
Have you tried randyscustomrifles.com/rifle-services or Ron Smith (RKS Barrels - Wimborne, Alberta) ?
I wonder if E. Arthur Brown would know someone. They offer a variety of Encore barrels.
IIRC IowaDon had some TCR barrel/monobloc switches, but don't recall who did the work.
IIRC TCR barrel swaps entail drilling out welds or pins, heating the monobloc while using a hydraulic press to push the barrel out(this might require some custom press plates for the monobloc), turning a tenon on the new short chambered 7 x 57 barrel, cutting an extractor slot, freezing the barrel and heating the monobloc to press them together, and adjusting chamber headspace with reamer. Not typical barrel installation work.
I wonder if there are double barrel shotgun 'smiths who might have the skills and equipment to put a new barrel in a monobloc.