JP,
Take a look throught the "Shooting and Reloading" Forum. This topic has been covered extensively, and you will find answers to most of your questions--even those you have not yet formulated.
A couple of quick comments--in my experience Remington UMC 115gr FMJ is quite possibly the worst 9mm ammunition manufactured to work in a Luger. Whenever I try it, it feed jams nearly every round.
The other element in feed jamming is the magazine. You will be best served using a modern-made mag--much more on this subject in "Shooting and Reloading" as well.
--Dwight
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