Welcome to the forum YankeeRebel (you can explain that sometimes), my limited experience with reloading for 9mm Lugers is that case length, overall length, magazine spring strength, and magazine condition cause more problems than lead or fmj. Few shoot hps well, and lugers like a powerful round depending on condition of the mainspring. I load 5.6g of unique with a 124g lrn. If you use a lighter fmj you can push it over 6g but the condition of the gun is a factor. Hugh Clark has an armadillo gun in .30 and another Luger in a wildcat round that probably is approaching .223 velocity but he is an exception.
rk
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