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7/15/2025, 2:58:41 AM
>>63985561
Usually when people say that, it's about a specific cartridge. For 9mm Parabellum, there's a fucking thousand different loadings for the cartridge dating back a century, some commercial, some military.
m/39B isn't just a hot load though, many subgun loads are just a +P or +P+ load, maybe or maybe not with a mild steel core inside the lead bullet, but this one's a hardened steel bullet with a lead core.
Thus, the projectile is murder on a lot of pistol's bores, and like said before the increased resistance from trying to squeeze that fucker down there makes pressures higher, so it's rough on locked breech pistols (old open-bolt subguns are almost always just blowback, so the pressure can always just move the bolt).
Supposedly the polygonal bores on Glock pistols make for less friction and resistance when shooting that stuff, hence why they manage to tolerate m/39B better than many other pistols.
Usually when people say that, it's about a specific cartridge. For 9mm Parabellum, there's a fucking thousand different loadings for the cartridge dating back a century, some commercial, some military.
m/39B isn't just a hot load though, many subgun loads are just a +P or +P+ load, maybe or maybe not with a mild steel core inside the lead bullet, but this one's a hardened steel bullet with a lead core.
Thus, the projectile is murder on a lot of pistol's bores, and like said before the increased resistance from trying to squeeze that fucker down there makes pressures higher, so it's rough on locked breech pistols (old open-bolt subguns are almost always just blowback, so the pressure can always just move the bolt).
Supposedly the polygonal bores on Glock pistols make for less friction and resistance when shooting that stuff, hence why they manage to tolerate m/39B better than many other pistols.
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