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The 224 Weatherby Magnum is one of the fastest .22 caliber cartridges ever produced in a factory load. Weatherby's 37-grain Hammer Custom ammunition pushes this velocity envelope even further, exceeding 4,125 fps from a standard 24-inch barrel. This light bullet weight, paired with a proven copper construction, gives you the flat trajectory needed for extended range work on coyotes, prairie dogs, and other varmints.
Hammer bullets are turned on a CNC lathe from solid copper blanks, which means every round gets the same obsessive quality control. Each bullet is weighed and micrometer-measured during production. The hollow point design sheds petals on impact while the core stays intact with a blunt front end, creating a focused wound channel. This predictable expansion at high velocity makes the 37-grain Hammer Custom particularly effective on smaller game where ballistic consistency matters.
Originally introduced by Roy Weatherby in 1963, this proprietary belted magnum was engineered to push the limits of what's possible in a .22 centerfire. Unlike wildcats or handloads, you get the engineering of a true purpose-built cartridge. The ammunition loaded here demonstrates why shooters have returned to this cartridge after its 2025 reintroduction. Factory loads from Weatherby represent the most straightforward way to feed a 224 Weatherby rifle without reloading.
There's no artificial stuffing of powder here. The 37-grain Hammer Custom is genuinely optimized for the 224's case capacity and pressure curve. With a G1 ballistic coefficient of .170, this bullet maintains energy downrange surprisingly well despite its light weight. This load is packaged in boxes of 20 rounds, giving you a practical quantity whether you're working a new rifle or stocking up for the season.
The 224 Weatherby Magnum is a proprietary Weatherby cartridge, so you'll need a rifle specifically chambered for it. Weatherby offers the Varmintmaster rifle in this caliber. Because it's a proprietary round with limited manufacturer support, make sure your rifle is clearly marked 224 WBY MAG before purchasing ammunition.
The 37-grain Hammer Custom is the lightest production load available and delivers the highest velocity at over 4,125 fps. This makes it ideal for maximum trajectory flatness at distance but less suitable for targets requiring deeper penetration. Other factory loads like the 50 and 55-grain options provide better balance for certain applications.
The 224 Weatherby Magnum was designed for varmint and predator hunting on coyotes, prairie dogs, and similar small game. The 37-grain Hammer Custom's light bullet and high velocity excel at this application. The expanding copper construction provides controlled terminal performance, though this load is less suited to larger game or close-range situations.
Yes, reloading is possible and common among 224 Weatherby enthusiasts. Brass is available from Weatherby and Norma, though it requires special attention. Standard .224-inch bullets and large rifle primers work, but you'll need loading dies and a reloading manual with 224 WBY data. Many reloaders prefer this cartridge specifically because it responds well to handloading optimization.
| Caliber/Gauge | 224 WBY Mag |
|---|---|
| Cost per Round | 4.25 |
| Grains | 37 GR |
| Manufacturer | |
| Manufacturer Part Number | M22437HCB |
| Units per Box | 20 |
| UPC | 747115459568 |
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