Hi,
IIRC, the ammo used at the time Lugers were current was the 125gn standard velocity bullet.
As long as it's standard velocity, and not "NATO" or +P power it will probably work.
But.. the Luger is pretty finely balanced, and you may find cycling problems surface with the heavier bullet.
I personally don't fire collectible Lugers because of the risk of damaging numbered parts.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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