I have a 1906 .30 Luger pistol that is finicky re: ammo, it won't reliably chamber. 30 Luger Fiocchi but does reliably chamber Prvi. In comparing OAL, Prvi is longer than Fiocchi. As I can find no other physical difference between the rounds I have concluded that Fiocchi OAL is too short for that particular Luger.
Fiocchi chambers just fine in my three other Lugers chambered for .30 Luger. So, I conclude most Lugers chambered in .30 Luger can tolerate shorter ammo (as Dwight explains in post #11) but if a FTF (nose-high jam) is encountered, it is worth testing longer ammo in that pistol.
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