i routinely go over a thousand rounds of lead in my 9, 45 and 38 with no leading or build up. As stated above, unless your pressure levels/velocity are into the max magnum range, you won't see leading if your bullets are sized correctly and lubed. I like plated as they're clean to handle, but they don't shoot any better, and often not as well...the plating is just one more variable in the bullet construction process that can off balance a projectile. And there have been lots of threads on poor plated bullets in canada. I can purchase 500 cast 124 9mm for half the cost of plated, and about 20% of what FMJ would cost...that equals lots more shooting. My 9 and 38 get loaded with bullseye, which is pretty darn quick and i have no leading.
a common mistake is to way over do the taper crimp on cast bullets and in effect size them down so they are no longer the correct size. this will generate gas cutting at the base and then you will lead like mad!
As said also, glocks and HK's will both shoot lead just fine, but in them you will get leading, and probably have to clean every 3-600 rounds, depending on your gun and load.