IMR Classic
IMR 3031
A long-established medium-speed rifle powder. Hodgdon notes its history with 308 match shooting using heavy match bullets, its use in small-capacity varmint cartridges, and its standing as a 30-30 Winchester powder.
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 | 100 of 198 (fastest = 1) — what this means |
| Typical cartridges | 308 Winchester, 223 Remington, 22-250 Remington, 30-30 Winchester |
Introduced in 1934 and still in production. Extruded single-base, made in Canada. Listed as subsonic-capable; not listed as temperature stable.
Burn rate
Medium burn speed, a little faster than IMR 8208 XBR and IMR 4895.
Chart agreement: consistent across the three charts that list it Ranked by: Hodgdon, Shooters World, Wolfe/LoadData.
Powders charted near it — neighbours on the chart are not substitutes, and adjacency tells you nothing about what charge either one takes:
- Hodgdon H322 (position 97)
- Accurate 2015 (position 98)
- Alliant Reloder 10x (position 99)
- Vihtavuori N133 (position 101)
- Hodgdon Benchmark (position 102)
- Hodgdon H335 (position 103)
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.