I have a recently bought a model 48 built in dec of 95. I don't know how many shots have gone though it but I doubt more than a few tins. I believe it to have the original seal and spring, It sure sounds "buzzy" compared to my m34 with the macarri spring and seal and tar of course.
I tried 3 types of pellets. Crossman premier Hollow points,RWS super h point, and beeman (H&N) match.
H&N match went like this, 846.5 843.5 849.2 828.3 845.1 835.6 844.0 840.0 826.9 820.8
CPHP 842 832 839 830 829 843 840 842 825 851
Super-H-Point 844 846 846 838 843 851 840 844 822
H&N match weighed 13.5 grains
CPHP weighed 14.2 grains
Super-H-Point. 14.5 grains
My chrony was 5 feet from the muzzle of my rifle.
I also discovered that 4 or 5 shots at the same spot blows a hole clean through and aging 2X4 at 30 feet.
the scope rings/bases were not apropriate for the gun. the rear base was against the screw at the back of the mount and the rings had only one clamping screw per side. I could see were the scope had been sliding in the mounts, so I just removed it before it broke the screw off the rear of the mount base. I have a proper base on order from PA. so when that comes in I will be able to give info as to accuracy.. When i was chronographing I was shooting offhand with open sights at a set of 2x4's that were about 30 feet away and groups around a nickle size for 5 shots were quite easy (i am quite a good shot on things that aren't breathing thank you very much). Thats how I found out that it didn't take alot of shots (4 to 5) to punch all the way through.
The barrel needs a good carefull cleaning though. I can see alot of lead when I get out the old magnifiers for a good look. i will get that done this week, I have treated a group of pellets with some ballistol to hopefully prevent future leading. It should work I think, it is German after all.