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Ah, I see.
I've found that plated bullets are a bit like a hybrid between a bare lead bullet and a jacketed one. They're not quite as hard as a jacketed one, so they obturate up to full bore diameter when fired, BUT they have the higher friction coefficient of a jacket, so it pays to keep loads mild with plated bullets.
My handbook from IMR doesn't list data for 165 grainers, but due to the above-noted condition regarding plated bullets, let's look at the data for 180-grain TMJs.
IMR 700x 4.6 gr 970 fps 34.6K psi
That's a MAX load. If you use the usual 10% reduction, a start load would be about 4.0 grs. I think I'd try a few at 4.0 and call it good.
Just a guess, but I'd wager you'd be getting right at 900 fps with the slightly lighter bullet - just about perfect for a practice/plinker/small game load.
NOTE FOR OTHERS - Do NOT fire reloaded .40 S&W rounds in any Glock pistol with the factory barrel, or any other pistol that does not have a fully supported chamber. If in doubt, check with the manufacturer, or use factory ammo only,
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