IMR Classic
IMR 4198
A fast-burning rifle powder aimed at small-capacity varmint cartridges and at large-bore, low-pressure lever and straight-wall cartridges. Hodgdon calls out both ends of that range in its own description.
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 | 89 of 198 (fastest = 1) — what this means |
| Typical cartridges | 222 Remington, 221 Remington Fireball, 45-70 Government, 450 Marlin, 444 Marlin, 7.62x39mm |
Extruded single-base powder, made in Canada. Listed as suitable for subsonic loads; not listed as temperature stable.
Burn rate
One of the fastest-burning rifle powders in the IMR line.
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:
- Accurate 2200 (position 86)
- Alliant Reloder 7 (position 87)
- Accurate LT-32 (position 88)
- Hodgdon H4198 (position 90)
- Shooters World SOCOM (position 91)
- Vihtavuori N120 (position 92)
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.