It's pretty tough to make a call based on this info. This isn't reloaded ammo with soft lead bullets is it?
First of all the Wiichester white box is considered to be a very good ammo for Lugers.
I sort of doubt that accuracy dropped off that badly after 3 magazines. But try to eliminate possibilities: Shoot slowly keeping the barrel from getting hot. Occasionally push a patch thru the barrel. Fresh targets every 5 shots. And use a shooting rest, trying to give as much attention and concentration to the 38th shot as you did the first. Focus on breath control, trigger pull, consistancy in your sight picture and repeatability.
dju
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