Hi:
For a round nose bullet, your OAL should be way out there at 1.169 to 1.173. At this length, you will be able to shoot a full 8 rounds without jams (if your magazine is in some kind of shape). Who cares if your top groove is exposed, as long as you don't drop the rounds in the dirt, it won't make a hill of beans of difference.
Now as to your load, for Unique, your load sound a bit low. If your bullets really weigh 124 grains, I'd work up from about 4.5 to 5.2, or so, looking for accuracy and perfect function..
Forget about throwing a powder like this and go get a scale. I know it takes longer, but you will be rewarded by fine accuracy in a Luger.
For your Bullseye load, try from 3.6 to 3.8 grains. My accuracy load with this powder is 3.7 grains with the 124 grain bullet.
Enjoy!!
Sieger
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