RE: What is this Mauser worth?
I have a 24 inch barreled 700 Rem in 280 that I have reached 3100 fps with the 140 grain Nosler BT. No signs of pressure at all. I had a model 70 in 7MM Mag that would not match that. You just never know. The 280 was a rebarreled LH Rem 700. ER Shaw did that one for me as they did quite a few others.
I have one of those 1909 Mausers too. Its still original so far. 7X57