THOR's right Mark... test the ammo by single loading one round with an empty magazine seated properly and see if it will consistently lock back the toggle with the holdopen. If it does that we have halfway home. That would indicate that the ammo is powerful enough to work the action.
Now... about those sharp edges... are you saying that the lower edge of the mouth of the chamber where the round must slide in order to leave the magazine and feed properly is a sharp edge? That should be smoothly radiused so there is no sharp edge. I know the radius requirement for this edge appears on the blueprints, but I am isolated from my print drawings for a week or so...
If you decide to polish this area, do it VERY lightly over a cylindrical form like a wooden dowel approximately the size of the 9mm cartridge... Just literally take the "edge" off by rounding it ever so slightly...Lugers should NOT be ramp polished as you might do on a 1911 Colt...
Since you say it is a custom barrel, it is likely that the barrelsmith (you?) left the chamber edge too sharp and it is catching the cartridge case while loading. Is there any evidence of the cartridges being "galled" by the sharp edge?
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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