Hi Wesley, and welcome to the forum...
Use a standard velocity 115gn grain bullet full metal jacket round. Something like the white box ammo sold by Winchester. Check out your local WalMart for good prices.
Don't use "NATO" power (high power) rounds, or +P ammo. Lugers were not designed for that. A lot of surplus 9mm ammo is machine gun ammo, which is also too high in power.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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