Description
IMR 4320 is a versatile, medium-burning rifle powder for handloaders building consistent, accurate rounds. It’s a solid choice for .308 Winchester, .30-06 Springfield, and similar cartridges where you need reliable metering and predictable performance. We started stocking this 8lb jug in early 2025, and it’s quickly become one of our steady sellers for a reason—it just works.
What Makes It Stand Out
- Consistent Metering: The extruded kernel design flows smoothly through powder measures, giving you repeatable charges shot after shot.
- Versatile Burn Rate: Sits right in that sweet spot for a wide range of popular mid-size rifle cartridges, making it a practical, do-more powder.
- Temperature Stability: IMR’s formulation handles shifts in ambient temperature well, helping maintain point of impact.
- 8lb Value: The larger jug offers better value per grain for the serious reloader who goes through volume.
- Clean Burning: Produces minimal fouling compared to some alternatives, meaning less time cleaning and more time shooting.
Tech Specs
| Powder Type | Extruded (tubular) |
| Burn Rate | Medium |
| Container | 8lb HDPE Jug |
| Weight (measured) | 4.1 oz |
| Ideal Cartridges | .308 Win, .30-06, .270 Win, 7mm-08 Rem |
| Manufacturer | IMR (Hodgdon) |
| Country of Origin | Canada |
| Our Stock Status | In Stock, Steady Seller |
Common Questions
What’s a good starting load for .308 Winchester?
Always consult a current, published reloading manual. For common 150-168 grain bullets, you’ll typically find starting loads in the 41-43 grain range. Start low and work up.
How does it handle temperature changes?
IMR 4320 is known for good temperature stability. While no powder is completely immune, you’ll see less velocity variation in hot or cold conditions compared to some other types.
Do you have any usage tips from your staff?
Our staff recommends breaking in any new powder lot with a 50-round test batch. Chronograph your loads, check for pressure signs, and confirm accuracy before loading a large quantity for carry or competition.
✅ Plain, unmarked packaging
✅ Easy 30-day return policy
✅ 256-bit encrypted checkout
✅ USA-based seller
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