IMR Classic
IMR 4831
Hodgdon positions it a step slower than IMR 4350, aimed at heavier bullets in medium-capacity magnum cartridges.
Specifications
| Manufacturer | IMR |
|---|---|
| Product family | IMR Classic |
| Status | Currently produced |
| Application | rifle |
| Grain form | extruded |
| Composition | single-base |
| Temperature stable | Not marketed as temperature-stable |
| Burn-rate position | 160 of 198 (fastest = 1) — what this means |
| Typical cartridges | 270 Winchester, 7mm Remington Magnum, 300 Winchester Magnum, 25-06 Remington |
Extruded single-base, made in Canada. Distinct from Hodgdon H4831 and H4831SC despite the shared number; the two are not interchangeable and use separate data. Not listed as temperature stable.
Burn rate
Slow — slightly slower than IMR 4350, and in the same neighbourhood as Hodgdon H4831.
Chart agreement: consistent, but single-publisher - ranked only by Hodgdon (and echoed by the Wolfe/LoadData compilation). No second manufacturer's chart carries it, so the position is uncorroborated. Ranked by: Hodgdon, Wolfe/LoadData.
Powders charted near it — neighbours on the chart are not substitutes, and adjacency tells you nothing about what charge either one takes:
- Winchester StaBALL 6.5 (position 157)
- Hodgdon Superformance (position 158)
- Alliant Reloder 19 (position 159)
- Ramshot Hunter (position 161)
- Vihtavuori N160 (position 162)
Sources
Other IMR powders
Verify the charge, not just the recipe
Good data gets you a safe starting point. It does not tell you what actually went into the case on stroke 340 — a bridged measure, a double charge, a squib. That is what an RCM Laser Powder Check is for.