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Thor · 10-03-2001, 01:13 PM

The recoil of the breechblock not only has to compress the spring, it has to accelarate the mass of the cannon (receiver/barrel/toggle/breech) assembly. With the input impulse being equal a gun with more mass has to have a lesser spring to work with underpower ammo. Luger barrels tend to give the most velocitys 90-124 gr with 6-8" barrels and medium speed powder. Hugh Clark has confirmed this with some loads maxing out in a 6" barrel being a little faster than the 8" The amount of powder in the small case is the limiting factor for velocity gains per barrel length.

After the powder is completely burned, increasing the barrel length after that point just slows the bullet down at the muzzle end of the barrel! Thor

10-03-2001, 01:13 PM	#3
Thor User Join Date: Jun 2002 Location: Rio Rancho, New Mexico Posts: 4,583 Thanks: 958 Thanked 970 Times in 276 Posts	Re: Longer barrels The recoil of the breechblock not only has to compress the spring, it has to accelarate the mass of the cannon (receiver/barrel/toggle/breech) assembly. With the input impulse being equal a gun with more mass has to have a lesser spring to work with underpower ammo. Luger barrels tend to give the most velocitys 90-124 gr with 6-8" barrels and medium speed powder. Hugh Clark has confirmed this with some loads maxing out in a 6" barrel being a little faster than the 8" The amount of powder in the small case is the limiting factor for velocity gains per barrel length. After the powder is completely burned, increasing the barrel length after that point just slows the bullet down at the muzzle end of the barrel! Thor