Winchester White Box, 115 gr. FMJ is about the most economical you will find, available at WalMart. It is also the go-to round when shooting a Luger for the first time. Try it first and see how things go. Slight variations in load and OAL among manufacturers sometimes lead to feeding problems, and the WWB is a good point of reference. I keep a variety of ammo, in case of this fussiness, to help solve an issue should one arise.
Above all, avoid +p, +p+, any ammo marked "NATO", and steel-cased or steel core rounds.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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