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Most loads from a 9mm carbine that get 1150 from a pistol will get around 1300fps from the carbine barrel. I know because I have cronograghed them and thats plenty fast enough to be supersonic. Breaking the sound barrier takes about 1125fps/768mph.
If your jacketed bullets are sticking in the barrel you may want to try some lead bullet loads. Lead will need less force to get through the barrel. Be careful with low powered loads that don't make it out of the barrel. Get one stuck and fire a second round behind it and bulge your barrel and your gun is finished forever. Marlin doesn't work on them or have parts so far as I know.
Why don't you shoot some standard 9mm factory loads through your suppressor and see how loud they are?
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