Quote:
Originally Posted by hdwhit
Check the diameter of your plated bullets with a micrometer. You will generally (there are exceptions) find that plated bullets run at or near the diameter of un-jacketed lead bullets and as such may be 5/10,000 or 1/1,000 inch LARGER than jacketed bullets. You must use a smaller powder charge since the powder will first have to essentially swage the bullet to the diameter of the barrel.
For example, for 9mm Luger, the plated bullets I have are generally 0.356 inch in diameter while the jacketed bullets are 0.355 inch in diameter. I do have some plated bullets that are 0.355 inch in diameter and they load fine using the data for FMJ 0.355 bullets, but the 0.356 bullets have to have a reduced powder load.
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You are correct. The Extreme 124 plated are .356 where their 124 FMJ are .355. (As a side note I notice Extremes 124 FMJ bullet profile is more rounded that others I compared it to.)
I just get think'n about this stuff and need to know. Great explanations guys, thanks.