No, My Minar is a 30-06 and the one Michael Petrov owned is the 257 that is going up for auction with Amoskeag on Nov 22nd.
We put them side by side and there is no doubt that they were built by the same maker. I considered bidding on the 257 but wouldn't know what to do with half of the world's known Minars.
When Michael and I put the two rifles together and got to looking I noticed a small letters had written in pencil in the bottom of the inletting. An A centered in an M. We figured it must have been the only marking Adolf Minar used to distinguish his rifles.

I think I posted some here on NE but I know Steven Dodd Hughes also has some of my photos of the Minar on his Fine Guns website as well.

http://www.finegunmaking.com/page32/page46/page46.html