Hello. I couldn't find my old notes from years ago when I chronographed 9mm handloads from an UZI with a 16" bbl. It seems that 115 gr Sierra JHC/6.2 gr Unique did right at 1500 ft/sec. I do not know of current load data specifically for carbines in this caliber, but would recommend slower powders such that you can take advantage of the extra bbl length. Best.
|