The barrel usually has the Austrian proof mark stamped: A number followed by a 'point' and another number as shown in the pic. in my case '1779.22' .22 being the year of proof - 1922
The serial numbers are pretty irrelevant as all records were destroyed when the factory was bombed during WW2, so there's no 'paperchain' to determine year of manufacture.
I contacted the chap I bought my rifle from..he says he had no such feed problems. He had however placed the rifle with a gunshop in Edinburgh, Scotland to sell. The rifle had been in their store for quite some time, indeed, that's where I collected the rifle from after agreeing the deal. So I'm now highly suspicious they may have swapped the magazine. Of course I have no way of knowing and the magazine is a correct one for 6.5x54MSch. but I now have to appreciate, ... possibly not the original one for my rifle! The important factor however is this: The feed ramp is machined into the action/receiver - separate from the magazine - so in theory, any magazine original or not should work?
There was no way to test the rifle before buying as no ammunition or even empty brass was available. Indeed having bought the rifle in March this year...only ten days ago did I acquire ammunition, brass and dies for it. Hey ho! Many thanks to all for your input. I'll post further when I resolve this issue. Cheers, deeangeo