I picked up my little Steyr Mannlicher last week and got out to the range with it Tuesday. I was dismayed to find the magazine wouldn't hold ammo and the cases came out extremely bulged just ahead of the web. I took the rifle apart today to find that it had been rechambered at one time to 6.5x55. A bit of a disappointment but not a deal breaker considering I didn't discover it till after the inspection period had lapsed. The 6.5x55 is a good round but the rechambering kind takes away from the classic nature of the old rifle.

Here's a picture of the cases. The one on the left a new unfired case and the one on the right fired in my rifle. Thanks in advance for any input on this matter.

These are the proof marks on the underside of the barrel. I assume BNP refers to Birmingham Nitro Proofed and the SE to the British equivalent of SAAMI. Do the Crown or crossed sabers give any indication of where the work might have been done?