Glad to hear that the mystery has been solved. My Lugers have been ammo sensitive from the get go. The Fiocchi 93gr JSP ammo is a jam-a-matic in my 30 cal Lugers....the 93gr FMJ do just fine. I don't shoot a lot of the Winchester-Western ammo due to it's cost and I only have a few boxes of it. If memory serves(always a big question), the muzzle velocities between the two brands are very similar. As GT noted, the OAL is different, and can be a cause of problems.
If you have a box of Fiocchi JSP you might try those. Some folks on this forum have had good results with it, I didn't. These old Lugers are a "challenge" to say the least.
I am a handloader so I can adjust the OAL, bullet profile, powder type and load, etc. to try an fine the correct combo that these old sweeties want.
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