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"There you have it. Barrel length affects velocity, but it depends on the barrel, the ammunition and maybe the temperature."
I'm going out on a limb and adding, it has a great deal to do with the speed of the powder burn. A large muzzle flash means You're not utilizing the burn to it's fullest, by expelling unburned powder in to the air, as opposed to nothing but smoke, which means the bullet has already started slowing down due to loss of propulsive power and friction in the barrel.
TSgt David L., SPC Randy Zimmerman,
SGT James Murphy, CPT Jack Durish,
COL Mikel J. Burroughs,
SPC Gary Welch, SGT Mark Anderson,
CPL Douglas Chrysler, Maj Marty Hogan,
1SG Steven Imerman, SMSgt David A Asbury,
MSgt Robert "Rock" Aldi, MSgt David Hoffman,
SSG Michael Noll, MAJ Dale E. Wilson, Ph.D.
SGM Erik Marquez, CW3 Harvey K.
MSgt James Clark-Rosa, Lt Col Mark Avery
I'm going out on a limb and adding, it has a great deal to do with the speed of the powder burn. A large muzzle flash means You're not utilizing the burn to it's fullest, by expelling unburned powder in to the air, as opposed to nothing but smoke, which means the bullet has already started slowing down due to loss of propulsive power and friction in the barrel.
TSgt David L., SPC Randy Zimmerman,
SGT James Murphy, CPT Jack Durish,
COL Mikel J. Burroughs,
SPC Gary Welch, SGT Mark Anderson,
CPL Douglas Chrysler, Maj Marty Hogan,
1SG Steven Imerman, SMSgt David A Asbury,
MSgt Robert "Rock" Aldi, MSgt David Hoffman,
SSG Michael Noll, MAJ Dale E. Wilson, Ph.D.
SGM Erik Marquez, CW3 Harvey K.
MSgt James Clark-Rosa, Lt Col Mark Avery
Pistol Barrel Length And Velocity
Posted from ssusa.org
Firearms and Guns
Ammo
Gunsmithing
Posted >1 y ago
Responses: 8
9
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That is why Hornady makes two different 9mm defense loads - Critical Duty for full-size pistols, and Critical Defense for compact and subcompact pistols. They are tailored for those barrel lengths.
(9)
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To add to SGT Whitmire’s explanation on barrel, the type of rifling can make a difference. HK and Glock barrels basically use polygonal rifling. This increases the seal between the projectile and barrel increasing pressure/velocity over traditional “land and groove” barrels.
(6)
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