Good thread. I've often wondered how potent a 9x19 Luger, out of a carbine, would be for light hunting (hogs and small deer).
I've tried different combos of loads through my carbine and have drawn the same conclusions that have been previously stated.
147gr bullets seem to "max" out at around 1400fps (w/over the book loads). It seems the blow back action of my carbine opens up at an unoptimal time and I see a bit of unburnt powder. Those locked breach guys get around 1500fps - lucky them. I may try using magnum primers to enhance the powder ignition.
124gr bullets can be pushed to over 1600 fps w/out issues. My issue is that my higher velocity loads use Blue Dot powder (for 115-147grn). While Blue Dot has given me the best velocity gain results it has a higher Standard Deviation and extreme spread. If you are a crack shot this probably wont matter. But, it does affect accuracy.
I've tried VV3N37, VV3N38, and ACC #9. 3N38 is pretty much like Blue
Dot in terms of velocity gains and with better E.S. and S.D. but it is $$$. #9 just plain sucked. Not enough room in the little case to get enough of the powder in. Likewise, #9 seemed to need a magnum powder to get it all burnt. 3N37 was clean and consistent like 3N38 but it didn't give much of a velocity bump.
I do have some VVN105 I've been waiting to try. I'm hoping it will be better than Blue Dot and 3N38.