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I was looking for info on the rimfire rounds to teach my grand-daughters. There's a great sticky on the ballistics comparison, but this info is more on the specific on the charachteristics in a reasonably brief format. Enjoy...
.17 HM2
The .17 Hornady Mach 2, is a rimfire cartridge introduced in 2004 by Hornady. The .17 HM2 is based on the .22 Long Rifle case, slightly lengthened and necked down to .17 caliber and using a bullet weighing less than half what typical .22 Long Rifle bullets weigh. The velocity is double that of a standard .22 Long Rifle, and that velocity generates a much flatter trajectory out to the 150 yard effective range of the cartridge. The high priced bullet used in the .17 HM2 does have its advantages, and accuracy is one of them. Since the .17 HM2 is based on the .22 Long Rifle Stinger, converting most firearms to .17 HM2 requires only a barrel change.[/I]
Specifications:
Parent case .22 Long Rifle Stinger
Bullet diameter .172 in.
Neck diameter .180 in.
Shoulder diameter .226 in.
Base diameter .226 in.
Rim diameter .275 in.
Case length .714 in.
Overall length 1.00 in.
Bullet weight - 17 gr. / Velocity - 2,100 fps. / Energy - 166 ft.lb.
.17 HMR
The .17 Hornady Magnum Rimfire, is a rimfire rifle cartridge descended from the .22 Magnum rimfire. It was developed by necking down the .22 Magnum case to take a .17 caliber bullet. Commonly loaded with a 17 grain bullet, it can deliver muzzle velocities in excess of 2550 fps. It is widely considered to be the one of the most accurate of the rimfire cartridges.
Specifications:
Parent case .22 WMR
Bullet diameter .172 in.
Neck diameter .190 in.
Shoulder diameter .238 in.
Base diameter .238 in.
Rim diameter .286 in.
Case length 1.058 in.
Overall length 1.349 in.
Bullet weight - 17 gr. / Velocity - 2,550 fps. / Energy - 245 ft.lb
Bullet weight - 20 gr. / Velocity - 2,350 fps. / Energy - 250 ft.lb.
.22 BB Cap
The .22 Bulleted Breech Cap, is a .22 caliber rimfire cartridge, .22 BB cap and .22 CB refer to cartridges that are low velocity and project reduced noise. These rimfires closely resemble a .22 caliber air rifle in power and are often used for indoor shooting and close range pest control. Developed for indoor shooting galleries with special "rimfire gallery guns", the .22 BB Cap was the first rimfire cartridge, dating back to 1845. It has no separate propellant charge, relying on the impulse created by the primer alone to fire a round lead ball.
Specifications:
Case Length: 0.284 in.
Overall Length: .343 in.
Bullet weight - 18 gr. / Velocity - 700 fps. / Energy - 20 ft.lb.
.22 CB Cap
The .22 Conical Ball Cap, is a .22 caliber rimfire cartridge which has a very small propellant charge (usually no gunpowder, just the primer), resulting in low muzzle velocity. This is similar to the muzzle velocity produced by a low to mid-power .22 pellet gun, however it should be noted that the bullet from a .22 CB cartridge is significantly heavier than a typical airgun pellet and therefore carries more energy. Due to their low power, CB rounds can be trapped by most pellet gun traps. CB rimfire rounds are often used for indoor shooting practice or for small pest control in areas where a limited range is an advantage due to crowding. The original .22 CB rimfire cartridge has the same case as the .22 BB Cap.
Specifications:
Case length: .284 in.
Bullet weight - 20 gr. / Velocity - 700 fps. / Energy - 22 ft.lb.
Bullet weight - 29 gr. / Velocity - 350 fps. / Energy - 8 ft.lb.
.22 Short
The .22 short, is a .22 caliber rimfire cartridge. Developed in 1857 for the first Smith and Wesson revolver, the .22 Short rimfire was the first American metallic cartridge. The original loading was a 29 grain bullet and 4 grains of black powder. Developed for self defense, the modern .22 Short, though still used in a few pocket pistols and mini-revolvers, is mainly used as a quiet round for practice. Due to its low recoil and good inherent accuracy, the .22 Short was used for the Olympic 25 m Rapid Fire Pistol event until 2004.
Specifications:
Case Length: .423 in.
Overall Length: .686 in.
Bullet weight - 29 gr. / Velocity - 1,045 fps. / Energy - 70 ft.lb.
.22 Long
The .22 Long, is a .22 caliber rimfire cartridge. The .22 Long dates back to 1871, when it was loaded with a 29 grain bullet and 5 grains of black powder, 25% more than the .22 Short rimfire it was based on. It was designed for use in revolvers, but was soon chambered in rifles as well. Many .22 Long Rifle guns will chamber and fire the shorter round, though the .22 Long generally does not generate sufficient energy to operate semiautomatic guns.
Specifications:
CaseLength: .595 in.
Overall Length: .880 in.
Bullet weight - 29 gr. / Velocity - 1,240 fps. / Energy - 99 ft.lb.
.22 Long Rifle
The .22 Long Rifle, is a rimfire cartridge that is well established with a variety of ammunition loadings, and in terms of units sold is still by far the most common in the world today. The .22 Long Rifle rimfire is a heavier loading of the .22 Long case and appeared in 1887, along with the first smokeless powder loadings of the .22 rimfires. It is one of the few cartridges that are accepted by a large variety of rifles, as well as pistols. Virtually every manufacturer of cartridge firearms makes at least one model chambering it, and this has been true for more than a century. There are a variety of different types of .22 Long Rifle (or ".22 LR") rimfire loads.
Specifications:
Case length: .595 in.
Case diameter: .225 in.
Bullet diameter: .224 in.
Rim diameter: .271 in.
Rim thickness: .040 in.
Cartridge overall length: .985 in.
Bullet weight - 40 gr. / Velocity - 1,082 fps. / Energy - 104 ft.lb. / (Subsonic)
Bullet weight - 36 gr. / Velocity - 1,328 fps. / Energy - 141 ft.lb. / (High Velocity)
22 WMR
The .22 Winchester Magnum Rimfire, is a rimfire rifle cartridge, commonly loaded with a 40 grain bullet, it can deliver velocities in the 2000 fps. range from a rifle barrel. The .22 WMR was introduced in the 1950s by Winchester, and it was the only successful rimfire cartridge introduced in the 20th century. The .22 WMR uses a larger case than the more popular .22 Long Rifle rimfire, both in diameter and length. The .22 WMR's case is also much thicker, allowing much higher pressures. Since the .22 WMR generally uses the same weight bullets as the .22 Long Rifle, it is generally used in similar situations. The 40 grain .22 WMR at 100 yards still retains the velocity of a .22 LR at the muzzle, which can provide improved penetration at all ranges, and more reliable expansion at long range with expanding bullets.
Specifications:
Case length: 1.052 in.
Overall length: 1.350 in.
Bullet diameter: .224 in.
Bullet weight - 40 gr. / Velocity - 2,020 fps. / Energy - 360 ft.lb.
.17 HM2
The .17 Hornady Mach 2, is a rimfire cartridge introduced in 2004 by Hornady. The .17 HM2 is based on the .22 Long Rifle case, slightly lengthened and necked down to .17 caliber and using a bullet weighing less than half what typical .22 Long Rifle bullets weigh. The velocity is double that of a standard .22 Long Rifle, and that velocity generates a much flatter trajectory out to the 150 yard effective range of the cartridge. The high priced bullet used in the .17 HM2 does have its advantages, and accuracy is one of them. Since the .17 HM2 is based on the .22 Long Rifle Stinger, converting most firearms to .17 HM2 requires only a barrel change.[/I]
Specifications:
Parent case .22 Long Rifle Stinger
Bullet diameter .172 in.
Neck diameter .180 in.
Shoulder diameter .226 in.
Base diameter .226 in.
Rim diameter .275 in.
Case length .714 in.
Overall length 1.00 in.
Bullet weight - 17 gr. / Velocity - 2,100 fps. / Energy - 166 ft.lb.
.17 HMR
The .17 Hornady Magnum Rimfire, is a rimfire rifle cartridge descended from the .22 Magnum rimfire. It was developed by necking down the .22 Magnum case to take a .17 caliber bullet. Commonly loaded with a 17 grain bullet, it can deliver muzzle velocities in excess of 2550 fps. It is widely considered to be the one of the most accurate of the rimfire cartridges.
Specifications:
Parent case .22 WMR
Bullet diameter .172 in.
Neck diameter .190 in.
Shoulder diameter .238 in.
Base diameter .238 in.
Rim diameter .286 in.
Case length 1.058 in.
Overall length 1.349 in.
Bullet weight - 17 gr. / Velocity - 2,550 fps. / Energy - 245 ft.lb
Bullet weight - 20 gr. / Velocity - 2,350 fps. / Energy - 250 ft.lb.
.22 BB Cap
The .22 Bulleted Breech Cap, is a .22 caliber rimfire cartridge, .22 BB cap and .22 CB refer to cartridges that are low velocity and project reduced noise. These rimfires closely resemble a .22 caliber air rifle in power and are often used for indoor shooting and close range pest control. Developed for indoor shooting galleries with special "rimfire gallery guns", the .22 BB Cap was the first rimfire cartridge, dating back to 1845. It has no separate propellant charge, relying on the impulse created by the primer alone to fire a round lead ball.
Specifications:
Case Length: 0.284 in.
Overall Length: .343 in.
Bullet weight - 18 gr. / Velocity - 700 fps. / Energy - 20 ft.lb.
.22 CB Cap
The .22 Conical Ball Cap, is a .22 caliber rimfire cartridge which has a very small propellant charge (usually no gunpowder, just the primer), resulting in low muzzle velocity. This is similar to the muzzle velocity produced by a low to mid-power .22 pellet gun, however it should be noted that the bullet from a .22 CB cartridge is significantly heavier than a typical airgun pellet and therefore carries more energy. Due to their low power, CB rounds can be trapped by most pellet gun traps. CB rimfire rounds are often used for indoor shooting practice or for small pest control in areas where a limited range is an advantage due to crowding. The original .22 CB rimfire cartridge has the same case as the .22 BB Cap.
Specifications:
Case length: .284 in.
Bullet weight - 20 gr. / Velocity - 700 fps. / Energy - 22 ft.lb.
Bullet weight - 29 gr. / Velocity - 350 fps. / Energy - 8 ft.lb.
.22 Short
The .22 short, is a .22 caliber rimfire cartridge. Developed in 1857 for the first Smith and Wesson revolver, the .22 Short rimfire was the first American metallic cartridge. The original loading was a 29 grain bullet and 4 grains of black powder. Developed for self defense, the modern .22 Short, though still used in a few pocket pistols and mini-revolvers, is mainly used as a quiet round for practice. Due to its low recoil and good inherent accuracy, the .22 Short was used for the Olympic 25 m Rapid Fire Pistol event until 2004.
Specifications:
Case Length: .423 in.
Overall Length: .686 in.
Bullet weight - 29 gr. / Velocity - 1,045 fps. / Energy - 70 ft.lb.
.22 Long
The .22 Long, is a .22 caliber rimfire cartridge. The .22 Long dates back to 1871, when it was loaded with a 29 grain bullet and 5 grains of black powder, 25% more than the .22 Short rimfire it was based on. It was designed for use in revolvers, but was soon chambered in rifles as well. Many .22 Long Rifle guns will chamber and fire the shorter round, though the .22 Long generally does not generate sufficient energy to operate semiautomatic guns.
Specifications:
CaseLength: .595 in.
Overall Length: .880 in.
Bullet weight - 29 gr. / Velocity - 1,240 fps. / Energy - 99 ft.lb.
.22 Long Rifle
The .22 Long Rifle, is a rimfire cartridge that is well established with a variety of ammunition loadings, and in terms of units sold is still by far the most common in the world today. The .22 Long Rifle rimfire is a heavier loading of the .22 Long case and appeared in 1887, along with the first smokeless powder loadings of the .22 rimfires. It is one of the few cartridges that are accepted by a large variety of rifles, as well as pistols. Virtually every manufacturer of cartridge firearms makes at least one model chambering it, and this has been true for more than a century. There are a variety of different types of .22 Long Rifle (or ".22 LR") rimfire loads.
Specifications:
Case length: .595 in.
Case diameter: .225 in.
Bullet diameter: .224 in.
Rim diameter: .271 in.
Rim thickness: .040 in.
Cartridge overall length: .985 in.
Bullet weight - 40 gr. / Velocity - 1,082 fps. / Energy - 104 ft.lb. / (Subsonic)
Bullet weight - 36 gr. / Velocity - 1,328 fps. / Energy - 141 ft.lb. / (High Velocity)
22 WMR
The .22 Winchester Magnum Rimfire, is a rimfire rifle cartridge, commonly loaded with a 40 grain bullet, it can deliver velocities in the 2000 fps. range from a rifle barrel. The .22 WMR was introduced in the 1950s by Winchester, and it was the only successful rimfire cartridge introduced in the 20th century. The .22 WMR uses a larger case than the more popular .22 Long Rifle rimfire, both in diameter and length. The .22 WMR's case is also much thicker, allowing much higher pressures. Since the .22 WMR generally uses the same weight bullets as the .22 Long Rifle, it is generally used in similar situations. The 40 grain .22 WMR at 100 yards still retains the velocity of a .22 LR at the muzzle, which can provide improved penetration at all ranges, and more reliable expansion at long range with expanding bullets.
Specifications:
Case length: 1.052 in.
Overall length: 1.350 in.
Bullet diameter: .224 in.
Bullet weight - 40 gr. / Velocity - 2,020 fps. / Energy - 360 ft.lb.
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