IMR Classic
IMR 8208 XBR
Designed specifically for match, varmint and AR-platform precision shooting. The short extruded kernels are intended to meter accurately through volumetric measures.
Specifications
| Manufacturer | IMR |
|---|---|
| Product family | IMR Classic |
| Status | Currently produced |
| Application | rifle |
| Grain form | extruded |
| Composition | single-base |
| Temperature stable | Yes — claimed by the manufacturer |
| Burn-rate position | 108 of 198 (fastest = 1) — what this means |
| Typical cartridges | 223 Remington, 5.56mm NATO, 308 Winchester, 7.62mm NATO, 6mm PPC |
Super short-grained extruded powder, made in Australia. It is one of the few non-Enduron IMR powders Hodgdon lists as temperature stable, and it is flagged as subsonic-capable.
Burn rate
Medium burn speed, between IMR 3031 and 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:
- Shooters World AR-Plus (position 105)
- Accurate 2230 (position 106)
- Accurate 2460 (position 107)
- Alliant AR-Comp (position 109)
- Ramshot TAC (position 110)
- Alliant Power Pro Varmint (position 111)
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.
8208 XBR is liked for its short-cut granule shape, which users expect (and generally report) to meter more consistently than long-grain extruded powders. It comes up as the preferred choice for heavy-for-caliber .223 match bullets by several posters, though others counter that if you trickle to weight the metering advantage is irrelevant.
- short-grain shape reported to meter better than long stick powders
- favored by some for heavy .223 match bullets
- described as giving up some velocity relative to ball powders
- availability described as spotty
Availability: Described as hard to find, with occasional retailer-specific restock posts treated as news. Considered less chronically absent than IMR 4064 but not reliably stocked.
Reported cautions:
- Users note that any metering advantage disappears if you are trickling charges to weight anyway.
Consensus level: commonly mentioned. Drawn from thread 1, thread 2, thread 3.
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.