Happy Easter all,
I made it to the range yesterday and I'm happy to say that the accidental load provided a pleasant side effect. The 9mm I was building these for is a Kel-Tec PF9. For those of you not familiar with the firearm, it's a very light, short, slim polymer piece suited only for concealed carry. The piece is no joy to shoot, it stings your trigger finger on every pull. Anywho... the undercharged loads fired/cycled flawlessly with the added benefit of reduced recoil. I can't speak to the pressure or velocity as I lack the equipment to establish these numbers but they seemed fine for practice rounds. That said, I don't think I'll be using the Berry's 9mm HP with that long straight-sided profile again. Seating them short enough to chamber was a little spooky.
Thanks for all your input.