1800 fps is pushing the limit for plain base, but that speed is attainable with accuracy if the bore is real smooth and temperatures aren't too high. Say a max of 70 deg F or so and cooler, which catches hunting weather in most of the US. 1400 to 1500 fps would be a more realistic speed for top accuracy, and will deliver lots of punch for small game when using a flatnosed bullet. I will always give the option of one cavity GC, one PB, or any combination if a 4 cavity, for $10 extra. This option will allow hot loads with the gc and low cost light loads with the PB in one mold.