I loaded about 20 rounds of 200 grain plated bullets after sizing the brass through the son's smaller sizing die. I didn't do any inside diameter sizing. I then measured the lengths, cycled them through my Kimber, and re-measured them. Lo-and-behold I couldn't measure any length difference with my calipers.
The next step is to check for length change of a few after they're recoil loaded by firing the one in front. I suspect I've found the answer, but I'll do this experiment before claiming victory.
BTW since they're obviously tighter, and my load was producing velocities higher than book value before, I lowered the powder charge by 0.4 grains. That puts the charge midway between starting and Max loads for lead in the Lyman book.
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I found that the Lee factory crimp die was the best thing to use when loading plated bullets.
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