IMR Classic
IMR Unequal
A dual-purpose handgun and shotshell powder. IMR highlighted its small flake size as giving uniform metering across handgun applications, with a burn speed that also suited a range of shotshell loads.
Discontinued. A medium-speed flake sold as a dual handgun and shotshell powder, covering 9mm, .40 S&W and .45 ACP on one side and a span of 12 gauge loads on the other, with small flake size for uniform metering as the selling point. It was too short-lived to develop a reputation. Archived data only.
- 9mm range loads
- .40 S&W
- .45 ACP
- 12 gauge field loads
Who has IMR Unequal today
Checked October 10None of the retailers we track list IMR Unequal right now. See what is in stock.
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 Canisters still circulate, but the maker no longer produces it — and load data for it may be withdrawn or archived.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 | pistol, shotshell |
| Grain form | flake |
| Typical cartridges | 9mm Luger, 40 S&W, 45 ACP, 12 Gauge |
Grain shape
Flake and therefore degressive: fast energy release, and less margin than a tube powder if a charge goes over. Small flakes meter well through a pistol measure, which was the design intent.
Why geometry decides burn rate more than chemistry does: Shape Is the Product.
Introduced by IMR in late 2016 as part of a five-powder family (Target, Red, Green, Unequal and Blue) marketed as REACH-compliant 'green technology' propellants. Discontinued. Hodgdon no longer lists this powder among current IMR products and it does not appear on Hodgdon's current relative burn rate chart.
This powder is obscure enough in the US that its practical character is thinly documented. The note above is deliberately short rather than padded.
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
The specifications above come from IMR's own published documentation, linked below. The two “RCM's read” sections are ours, not theirs — our assessment of what this powder is like to load, drawn from its published characteristics and from what handloaders consistently report. No manufacturer endorses them and no source below backs them. If you think we have one wrong, tell us — we would rather fix it.