A bit of Dutch history in 9mm

Snakeman · 04-05-2006, 02:30 AM

By the way, concerning the Mk2Z: the Swedish took a different approach in designing ammunition for the M45 Gustav sub machine gun- also based on the Patchett principle. Instead of changing the powder they changed the bullet itself: the mantel is a copper washed steel core that is lead filled.

As you can see the steel mantel is rather thick at the point where the bullet meets the rifleing. This higher resistance, caused by the lower malleability of the steel as opposed to lead gave a higher pressure and a greater reliability even in the cold of the Swedish winter. This round has the unfortunate (for the wearer) capacity of defeating body armor that would normally stop a regular 9mm round and, when used in firearms not designed for it (anything but the M45 and the like), early firearm demise is assured. IÃ?Â´ve seen many SIG 210s with cracked frames caused by the use of the M39B cartridge.

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04-05-2006, 02:30 AM	#1
Snakeman User Join Date: Nov 2005 Location: Sweden Posts: 31 Thanks: 0 Thanked 0 Times in 0 Posts	By the way, concerning the Mk2Z: the Swedish took a different approach in designing ammunition for the M45 Gustav sub machine gun- also based on the Patchett principle. Instead of changing the powder they changed the bullet itself: the mantel is a copper washed steel core that is lead filled. As you can see the steel mantel is rather thick at the point where the bullet meets the rifleing. This higher resistance, caused by the lower malleability of the steel as opposed to lead gave a higher pressure and a greater reliability even in the cold of the Swedish winter. This round has the unfortunate (for the wearer) capacity of defeating body armor that would normally stop a regular 9mm round and, when used in firearms not designed for it (anything but the M45 and the like), early firearm demise is assured. IÃ?Â´ve seen many SIG 210s with cracked frames caused by the use of the M39B cartridge.