IMR Classic
IMR 4064
Hodgdon calls this the most versatile propellant in the IMR line, covering everything from small varmint cartridges to medium magnums, with an emphasis on uniformity and accuracy.
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 | 119 of 198 (fastest = 1) — what this means |
| Typical cartridges | 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester Magnum |
Extruded single-base, in production since 1935, made in Canada. The long kernels are known to meter less consistently than short-grain or spherical powders. Not listed as temperature stable.
Burn rate
Medium burn speed, essentially alongside IMR Enduron 4166 and just slower than IMR 4895.
Chart agreement: consistent across charts - listed in the same relative neighbourhood by every publisher that carries it Ranked by: Hodgdon, Vihtavuori, 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 2495 (position 117)
- IMR Enduron 4166 (position 118)
- Norma 202 (position 120)
- Accurate 4064 (position 121)
- Shooters World Tactical Rifle (position 122)
What reloaders say about it
Unverified community anecdote. The following is a summary of what handloaders report in public forums. It is not manufacturer information, it has not been tested, it may be wrong, and it contains no load data by design. Treat it as colour, not guidance.
IMR 4064 has a devoted following among milsurp and M1 Garand shooters and people loading .30-06 and .308, described as a genuinely do-all powder with excellent case fill in large-capacity .30 cases. The dominant sentiment in current threads is nostalgia and frustration: people who used it for decades say they simply cannot find it and have moved on.
- strong reputation for M1 Garand and milsurp .30-cal loads
- described as excellent case fill in .30-06-class cases
- notoriously poor metering through progressive-press powder measures
- seen as scarce enough that finding it is post-worthy
Availability: Widely reported as very hard to find in 2025-2026, and several users describe it as disappeared from shelves entirely for years. When it does surface it is generally in new-old-stock lots or large kegs at prices well above what users consider normal. Hoarding is frequently blamed in these threads.
Reported cautions:
- At least one user reports moving to Vihtavuori powders because they could no longer source 4064, and now reserves their remaining supply only for previously developed loads — an example of scarcity forcing a full re-development, not a swap.
- One user specifically switched away because the measure on their progressive press would not handle it.
Consensus level: widely held. Drawn from thread 1, thread 2.
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.