Re: Electroplated thickness /Berry's -Ranier- X-treme
Thickest plating is on the Gold Dot (tm) slugs.
But them's Premium Bullet$.
I can speak only to the Berry's stuff, which in .40 at 155s I've shot to 1100 fps or so (IIRC), and in .357 with 125s I've launched at something more than 1200 fps.
No real problems with either, though accuracy at any speeds (including .38 Sp at 700 fps) has never been quite as good as my own cast bullets.
Commercial cast bullets with that crayon-like lube, though--almost always the worst accuracy of anything I load, equalling one batch of lesser-brand lead .40 ammo I bought once. Plus they usually lead anyway...
So I reserve the plated bullets to nothing more demanding than an IPSC A-Zone or a 2-liter plastic soda jug at 25 yards.
NONE of them have ever leaded on me, in several pistols and revolvers, .38 Sp, 9mm, .40, .357 & .45 ACP.
Can't remember what non-Berry's I once used years ago, but they worked too.