Mac79912, thanks for the heads up. I'll only be feeding it standard load FMJ, hopefully it doesn't start stove-piping on me.. but if it does, I'll know how to fix now!
I found the spare magazine for you and it will be on the way once I locate a small padded envelope.
You are probably right about sticking with ball ammo. The earlier Beretta designs, like your Helwin, were designed for standard ball ammo. Whenever I look at an older Beretta pocket pistol I look for evidence that the owner had been disappointed by inability to feed sp or hp and took a Dremel tool to the feed ramp. You can remove metal but you can't put it back so many now rare collector pieces like the model 90 32 acp can be found, usually with altered feed characteristics; ie: it will never feed right again.
My guess is that the Helwin is the same. It was designed by Beretta to feed, shoot and eject standard factory 9mm Luger.