I don't have any experience in pistols, but in my revolvers, I've always bumped up the charge on plated bullets using the theory that plated bullets, as do jacketed bullets, would create more friction.

Fortunately, some years ago, I cast sort of a lifetime's worth of gas-checked bullets in various calibers. Maybe it's just me, but I get good performance with low velocity loads, jacketed bullet velocity when needed, great accuracy, and not as much dirt as with softer non-gas check bullets.