.22 WMR VS. .22 WRF

The .22 Winchester Magnum Rimfire (WMR) and .22 Winchester Rimfire (WRF) are two different cartridges designed for rimfire firearms. While they share some similarities, they are not interchangeable due to differences in dimensions and performance.

1. .22 Winchester Magnum Rimfire (WMR):
- Bullet Diameter: .224 inches
- Case Length: 1.055 inches
- Maximum Average Pressure (MAP): Around 24,000 to 27,000 psi
- Typical Bullet Weights: 30 to 50 grains
- Muzzle Velocity: Varies depending on bullet weight and barrel length, but it can range from 1,500 to 2,300 feet per second (fps)
- Typical Use: The .22 WMR is a more powerful and longer-range rimfire cartridge compared to the .22 Long Rifle (LR). It is commonly used for varmint hunting, target shooting, and plinking.

2. .22 Winchester Rimfire (WRF):
- Bullet Diameter: .224 inches
- Case Length: 0.707 inches
- Maximum Average Pressure (MAP): Around 20,000 psi
- Typical Bullet Weights: 40 grains
- Muzzle Velocity: Varies depending on barrel length, but it typically ranges from 1,100 to 1,250 fps
- Typical Use: The .22 WRF is an older rimfire cartridge that offers more power than the .22 LR but less than the .22 WMR. It is primarily used for small game hunting and plinking.

In terms of compatibility, it's important to note that firearms chambered specifically for .22 WMR will not accept or fire .22 WRF ammunition due to the differences in case length and chamber dimensions. Attempting to use the wrong cartridge in a firearm could lead to dangerous malfunctions and potentially cause damage to the firearm or injury to the shooter.

Always use the appropriate ammunition designated for your firearm and refer to the manufacturer's specifications and guidelines to ensure safe and reliable operation.

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