i bought a custom rifle recently ,custom thumbhole stock , barrel ect... built on a 09 argentine mauser. the guy claimed it was a 7mm mag, but the barrel is not stamped as far as i can see. It will not chamber the empty's from my 7mm mag , i was able to close the bolt on one case but it was very tight and the ejected shell had some shiny scuff marks on the side. i have had to full length size cases already when switching from one rifle to another, all factory rifles though, in order for them to chamber easily.... but i have never had one that you couldn't close the bolt. Could this rifles chamber be that tight?