Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Winchester Dynapoint 22 WMR loads a 45-grain plated hollow point to 1550 feet per second, delivering 240 foot-pounds of muzzle energy for varmint hunting and high-volume plinking. This 22 Winchester Magnum Rimfire (WMR) cartridge — also called .22 Mag — extends effective range over .22 Long Rifle while maintaining the affordability and ease of handling that make rimfire platforms practical for pest control, small game hunting, and extended range sessions. The plated hollow point expands reliably on soft tissue without the jacket separation common in thinner-clad rimfire bullets, and the supersonic velocity keeps trajectories flat inside 100 yards.
Load Profile
Winchester uses a plated hollow point construction that balances expansion characteristics with feeding reliability across bolt-action rifles, lever guns, and semi-automatic rimfire platforms. The 45-grain projectile sits at the lighter end of the WMR spectrum — heavier 50-grain loads trade velocity for penetration, while 30- and 40-grain options push higher speeds at the cost of terminal energy. At 1550 fps, this load remains supersonic past typical varmint engagement distances, and the 240 ft-lbs of energy exceeds what most shooters extract from hyper-velocity .22 LR by a factor of two. Packaging is 50 rounds per box, brass-cased, non-corrosive rimfire primers.
Specs at a Glance
| Spec | Value |
|---|---|
| Cartridge | 22 Winchester Magnum Rimfire (WMR) |
| Bullet weight | 45 Grains |
| Bullet type | Plated Hollow Point |
| Muzzle velocity | 1550 Feet Per Second |
| Muzzle energy | 240 Foot Pounds |
| Rounds/box | 50 Round |
| Case | Brass |
| Primer | Rimfire |
| Corrosive | No |
| Lead Free | No |
| Velocity Rating | Supersonic |
| Intended use | Hunting, Plinking |
| Country of Origin | United States of America |
| Manufacturer | Winchester |
This load suits bolt-action varmint rifles, lever-action ranch guns, and semi-automatic rimfire platforms chambered in 22 WMR ammo. Shooters running suppressed setups will hear first-round pop from the supersonic crack, though follow-up shots remain hearing-safe with adequate ear protection. The plated construction reduces fouling compared to bare lead, extending cleaning intervals during high-round-count range sessions.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Always follow the four rules of firearm safety when handling firearms and ammunition.
- Verify current state and local ammunition laws in your jurisdiction before ordering.
- This ammunition contains lead. Per California Proposition 65, exposure to lead during handling or firing may cause cancer and reproductive harm. Wash hands after handling, and ensure adequate ventilation when shooting indoors.
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