IMR Classic
IMR PB
A shotshell and handgun target powder. The PB designation refers to its porous-base kernel structure.
Discontinued. Canisters still circulate, but the maker no longer produces it — and load data for it may be withdrawn or archived.
Specifications
| Manufacturer | IMR |
|---|---|
| Product family | IMR Classic |
| Status | Discontinued |
| Application | shotshell, pistol |
| Grain form | extruded |
| Composition | single-base |
| Typical cartridges | 12 Gauge, 20 Gauge, 28 Gauge, 45 ACP |
Discontinued. Hodgdon no longer lists this powder among current IMR products and it does not appear on Hodgdon's current relative burn rate chart. It was long favoured for light target shotshell loads. No manufacturer product page remains.
Data confidence
We flag entries we could not fully verify rather than presenting them as solid:
- Discontinued — no live manufacturer product page; details drawn from archived or secondary manufacturer material.
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.