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No. 110200
ID: b48b04
Do not reload for a Glocknade in calibers other than 9mm, at least not using the stock barrel, which in larger calibers is oval shaped with a few hundredths (not thousandths, hundredths) vertical slop to help feeding with ginormous .40 caliber hollowpoints and case head support ranging from mediocre to nonexistent. I've shot a range rental Glock 23 that left every fired case looking pregnant, and that was with factory ammo ammo, not reloads, and they were only 180gr FMJ practice ammo, nothing hot or outrageous. You didn't need a micrometer. You could see the bulged cases, each one with a little smile, with the Mark One Eyeball.
If you must do this, you would be well advised to find an aftermarket barrel that has a tighter chamber and better case head support than stock.
You may also want to look into an extra power recoil spring. I admit I don't know as much as I should about Glocks, but when S&W tried to make M&Ps in 357 SIG they could not make them run reliably without an extra power recoil spring to keep the slide from cycling faster than the magazine spring could push the top cartridge into place. There were also serious problems with frames getting battered. It's strange. From just strict comparison of momentum to momentum, a 357 SIG load with a 124gr bullet at 1300-ish feet per second ought to have less recoil and muzzle flip than a .40 caliber load with a 180 at 950. But the opposite is true. 357 SIG batters frames and beats the hell out of guns. SAAMI max allowable pressure for 357 SIG is 40K PSI, compared to 35K for .40 and 37,500 for 10mm. I find myself wondering if the higher pressures are contributing to extra slide velocity. Those pressures make me feel very much not warm and fuzzy about trying my luck with Glock case head support.
Also, be advised that 357 SIG, as a bottlenecked case, can't be reloaded with carbide dies. It needs steel dies and lube, like .223.
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