Mike,
I believe it will work,it might require a little fitting and the bolt face will have to be opened up. 6.5x54 MS has a head dia. of about .445" and 8x56MS should be about .468".Any gunsmith that does conversions should be able to do the job.

Ken, The H-mantel is one of my favorite bullets also, great in my 7x57R.Hornady has .268" 6.5 bullets for Carcano, should work in MS.
Mike

Last edited by Der Ami; 04/09/13 05:16 PM.