Thank's, I saw this coiled cartrige allready, but didn't realized it's Coiled!
Well, I made the owner to make chamber cast ASAP, but now I'm pretty sure it's 450-3&1/4 NFBP double rifle. The owner bought cases from some US company named Jackson-Jaxon-Jaison... whatever and I believe this cases have to be formed by correct dies again to match 450-3&1/4.


Geno.