Check this
parts breakage link for some useful info.
I shoot a 1936 S/42, 300 rounds a month or so, with virtually no failures. I am...not rigorous...about cleaning. I use Mec-Gar magazines and Winchester and S&B ammunition exclusively.
I have a couple other Lugers which I shoot sometimes, a parts gun and an Artillery which is not in pristine condition, but I fall on the side of the fence which doesn't shoot the valuable Lugers on account of breakage potential.
I get considerable enjoyment from both the shooting and non-shooting collecting activity.
--Dwight