Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The CCI Maxi-Mag pushes a 40 grain full metal jacket bullet to 1875 feet per second, delivering 312 foot-pounds of energy at the muzzle. That velocity keeps trajectories flat inside 100 yards and ensures reliable cycling in semi-automatic rimfire rifles and pistols. CCI has loaded rimfire cartridges since 1962, and the Maxi-Mag line remains a staple for shooters who need consistent ignition and predictable downrange performance without the premium price of match-grade loads.
Performance at a Glance
The 40 grain FMJ slug stabilizes quickly out of standard 1:16 twist barrels common to 22 WMR platforms. The full metal jacket construction minimizes fouling compared to exposed lead rounds, extending cleaning intervals during high-volume range sessions. At 1875 fps, this load sits in the supersonic band — expect a sharp crack and enough retained energy for steel poppers at practical rimfire distances.
| Spec | Value |
|---|---|
| Caliber | 22 Winchester Magnum Rimfire (WMR) |
| Bullet weight | 40 Grains |
| Bullet type | Full Metal Jacket |
| Muzzle velocity | 1875 Feet Per Second |
| Muzzle energy | 312 Foot Pounds |
| Rounds/box | 50 Round |
| Corrosive | Non-corrosive |
| Intended use | Range & Target |
| Manufacturer | CCI |
CCI manufactures this load in the United States. The non-corrosive primer keeps actions clean, and the FMJ profile feeds reliably through magazine-fed platforms. For more rimfire options, browse our full 22 WMR ammo inventory.
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 observe the four rules of firearm safety when handling live ammunition.
- Verify current state and local ammunition purchasing and storage laws in your jurisdiction before ordering.
- This product contains lead, a chemical known to the State of California to cause cancer and reproductive harm under Proposition 65. Use adequate ventilation when shooting indoors, and wash hands after handling.
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