I go a bit and stop and look at the round and maybe measure length. You can easily feel the resistance as it begins to expand the case. When I begin seating a new bullet weight, I back off the seating stem a little and start seating a bullet. Conversely, seating the bullet out longer reduces pressures, although not as dramatically.įor that reason, I often seat bullets a bit longer than the published length, but there is no arbitrary number. If a bullet is seated deeper than the length shown, pressures can go up-sometimes catastrophically.
#9MM WIN MAG LOAD DATA MANUALS#
Loading manuals always tell us a number, but only one end of that equation matters. But the folks who publish loading manuals do, and that’s peachy.Īnother factor that can confound handloaders is overall length. And if so, how much? Does the difference have an effect on pressure? Well, probably but not much, and the handloader simply doesn’t have the equipment to find out anyhow. It is questionable whether one thousandth of an inch of diameter matters. So that’s where we start, but the Hodgdon website also has data for quite a few other cartridges, and when time permits I’m going to try it in the 45 ACP. The label on the new can says “shotshell” and then says, “Also fits a wide range of handgun calibers.” Actually, that is true for quite a few shotshell powders, but Winchester suggests that 572 would be especially nice in 9mm Luger and 38 Super. Hodgdon uses “spherical” instead, and this has caused a little confusion. Winchester owns the trademark for “Ball Powder,” so nobody else can use it, even if the product was made in the same place. The company sold the plant to General Dynamics and licensed Hodgdon to market powders under the Winchester name. Winchester 572 obviously carries the Winchester name, and once upon a time the St. And Winchester 572 fit nicely into the 9mm and 38 Super niche. As powder manufacturing methods have improved, it has become possible, and profitable, to define “niches”-powders designed for a specific cartridge or a family of cartridges. as a shotgun powder for use in 20- and 28-gauge target loads, but as is often the case, it turned out to be a good pistol powder, too. This time it is Winchester with a number that rang bells-until I figured out it wasn’t 571 of yesteryear. Just when you think you’ve finally settled on the powder for the 9mm Luger, somebody comes along with a monkey wrench in the form of a new one.
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