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I have some coated 115 Grain 9mm bullets that I want to load.
How would the powder charge compare to hard cast lead or a jacketed bullet?
I'm using Hodgdon Universal.
I use any lower end lead, FMJ, plated, coated data interchangeably for all 45ACP loads. And because I’m easy prey for good advertising, I use Sport Pistol exclusively for coated bullets.
I too use cast data when it’s available. If none is available I use (.9 * Jacketed).
My chrono results with coated show they fly faster than lubed lead with an equivalent load. Good luck.
My method:
Load a few rounds each with about 4 different powder charges across the range of book data.
Fire over chronograph.
Pick the load with the velocity I want (to give power factor 130 or so in 9mm P) and standardize on it as long as those components last.
Close, but one must also add 1.347% for red powder cured in a 412.6 degree convection oven, and drop charge for a velocity running around the speed of sound with slow powder charges that run no less than 87.5% of case capacity with exact case length and depending on crimp applied with a left handed turret press only. This formula is used mostly in the Northern Hemisphere during clear weather running normal Texas ambient temperatures five days prior to a tornado coming from western Mississippi only.
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