IMR Classic
IMR 4831
Hodgdon positions it a step slower than IMR 4350, aimed at heavier bullets in medium-capacity magnum cartridges.
A step slower than IMR 4350 and aimed squarely at heavier bullets in .270 Winchester, .25-06, 7mm Remington Magnum and .300 Winchester Magnum. Get one thing straight before anything else: this is not Hodgdon H4831 or H4831SC. Shared number, different powder, different data, no crossover, and people still get this wrong. Beyond that it is a conventional slow stick powder with good case fill in medium magnums, no temperature-stability claim, and long-kernel metering.
- heavy-bullet .270 Winchester
- 7mm Remington Magnum
- .25-06 Remington
- .300 Winchester Magnum
Who has IMR 4831 today
Checked October 10Out of stock at every store we track
| Store | Size | Shelf | In hand /lb | Stock |
|---|---|---|---|---|
| Bruno Shooters Supply$26.95 hazmat + $19.95 ship | 8 lb | $409.99 | $57.11 | Out |
| Lohman ArmsHazmat charged, amount not published | 8 lb | $465.95 | $62.17 est. | Out |
| Hodgdon (direct)Terms not published | 8 lb | $475.99 | $63.43 est. | Out |
| Graf & Sons$23.50 hazmat per package | 8 lb | $471.99 | $63.68 | Out |
| Lohman ArmsHazmat charged, amount not published | 1 lb | $63.95 | $95.39 est. | Out |
| Hodgdon (direct)Terms not published | 1 lb | $68.99 | $100.43 est. | Out |
| Bruno Shooters Supply$26.95 hazmat + $19.95 ship | 1 lb | $56.99 | $103.89 | Out |
| Graf & Sons$23.50 hazmat per package | 1 lb | $67.99 | $105.44 | Out |
“In hand” is the shelf price plus that store’s hazmat fee and shipping, spread over one container. Stock is checked once a day — confirm on the store’s page before ordering. Compare all powders →
Specifications
| Manufacturer | IMR |
|---|---|
| Product family | IMR Classic |
| Status | Currently produced |
| Application | rifle |
| Grain form | extruded |
| Lee VMD (bulk density) | 0.0735 cc per grain · 0.88 g/cc |
| 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 |
Grain shape
Long single-perforated extruded sticks. The web is thicker than IMR 4350's, and that wall thickness, more than anything else, is why it burns slower: same family, more powder to burn through. Long kernels mean the usual bridging and shearing in a measure.
Why geometry decides burn rate more than chemistry does: Shape Is the Product.
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
The specifications above come from IMR's own published documentation, linked below. The two “RCM's read” sections are ours, not theirs — our assessment of what this powder is like to load, drawn from its published characteristics and from what handloaders consistently report. No manufacturer endorses them and no source below backs them. If you think we have one wrong, tell us — we would rather fix it.