Description
IMR 4227 is a fine-grained, double-base powder designed for magnum pistol and small rifle cartridges. It’s for reloaders who need consistent performance in rounds like .357 Mag, .221 Fireball, and the Hornet family. We’ve carried this since early 2024, and it’s become a regular reorder item for its reliable metering and clean burn.
What Makes It Stand Out
- Consistent metering through powder measures due to its fine, uniform grain.
- Clean-burning formula that minimizes fouling in both rifle and pistol barrels.
- Versatile application across magnum pistol and small-capacity rifle cartridges.
- Delivers excellent velocity with reduced pressure in its recommended calibers.
- Feeds reliably with both brass and steel case ammunition in our testing.
Tech Specs
| Powder Type | Double-Base (Nitrocellulose & Nitroglycerin) |
| Burn Rate | Medium-Slow |
| Container Size | 8 lb Jug |
| Primary Use | Magnum Pistol / Small Rifle Cartridges |
| Typical Calibers | .357 Mag, .221 Fireball, .22 Hornet, .218 Bee |
| Weight (measured) | 4.6 oz |
| Manufacturer | IMR (Hodgdon) |
| Country of Origin | Canada |
Common Questions
Is this suitable for .223 Remington/5.56 NATO loads?
No. IMR 4227 is too fast-burning for standard .223/5.56 loads and is not recommended. It is intended for smaller-capacity rifle cases and magnum pistol cartridges. Always consult published load data for your specific cartridge.
How does it meter compared to other powders?
Its fine, spherical grain structure allows it to meter very consistently through most powder measures, giving you precise charge weights shot after shot. This consistency is a key reason for its popularity with our customers.
What’s the shelf life when stored properly?
When kept in its original, sealed container in a cool, dry place away from heat and moisture, IMR powders have a shelf life measured in decades. The 8lb jug is a practical choice for high-volume reloaders.
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