I was able to purchase a slightly used 9 mm shield a couple of years ago. Started loading shells with either 4 or 4.1 gr Unique powder, and the pistol would barely function. Turned out to be a great round to start my wife out on. I increased the powder chg to 4.5 grain Unique and I feed 3-9 mm Shields with my reloads. I haven't had a problem with either pistol that hasn't been operator error.

Have a blessed day,

Leon