For me plain bases are fine in pistols to about 900 fps, and I have run a beveled base pistol 158 swc in a Whelen to 1450 fps with 13.0grs bluedot to great accuracy and no leading problems. I won't be pushing these speeds with the plain base loads. Gas checks change everything, and if you're really up for a chore apply them to low velocity loads. Petersons Publications Handloader cast bullet expert Mike Venturino came to the conclusion that gas checked bullets are usually/almost always more accurate and plain bases at any speeds.
For my own hunting loads GC rifle bullets can be pushed to 2500 fps with about the same accuracy as military ball surplus. 1 MOA is easily produced in an accurate target rifle and about 2 MOA with irons at 100 yds. I make my own beeswax based lube and haven't seen a need to switch to a PC operation
