lead or plated bullets are usually a thousandth or two larger than the jacketed versions, this is a small enough difference that you don't have to change your seup much, but be carefull about crimping too tight, it can split the plating and can leave bits of plating behind, and negates the cleaner benefits of plating, just make sure you follow lead load data to avoid overpressure, because the tighter fit and better seal cause higher pressures with the same charge weight, I usually load 45acp with 5gr of bullseye for jacketed .451 jacketed bullets, and 4gr for lead or plated .452 dia bullets, both are very accurate and reliable in my kimber 1911 and sig 220, plated are a lot cheaper though