there should be prints on file with a reamer maker. it dont cost much more to have one cut than one off the shelf. Id guess around $150 or so another option is having a existing reamer recut have a 7.62x54 cut down to 6.5mm. I have been wantong to do a Mosin in 6.5 for a while.The chambering reamers and sizing dies for any of the 6.5x54 variants will have to be custom made. That's why I went to the 6.5x54 Mannlicher instead - and it's available in both rimmed and rimless variants.