I am thinking of trying polymer coated bullets for 9mm, 38 special, and 32 H&R. The ones from Acme look pretty good and the price is right. I’ve only loaded copper plated and jacketed bullets so far. So, a couple of questions on the polymer bullets: I am going to work up loads, but in general do polymer bullets require less powder for achieving similar velocity to plated bullets? The bullet diameters for polymer are slightly larger than the plated bullets I have been using. Seems like less powder would be needed to produce the same pressure and using cast lead bullet load data would be appropriate since the polymer bullet diameters are the same as cast lead. Another question is whether I can seat and taper crimp in one step with the polymer bullets. I’ve always seated and (very lightly) taper crimped with one die and haven’t had any shaving problems with copper plated bullets, but are polymer coated more sensitive? Are there any other things I need to consider with polymer bullets? Do they hold up well at 9mm pressures and velocity?