Lindcott Armory Hodgdon Powder Company · Extruded
IMR 4166
Enduron series temperature-insensitive extruded powder with a copper fouling reducer additive.
- Manufacturer
- IMR
- Grain shape
- Extruded
- Burn rank
- #63
- Category
- Rifle Medium
- Temp sensitivity
- Low
- Application
- Rifle
- Origin
- USA
- Status
- Discontinued
Burn-rate position
FastestSlowest
Typical cartridges
By cartridge
.308 Winchesteralso used: Shooters World Economy Rifle, Accurate 2230, A1
6.5 Creedmooralso used: IMR 3031, N550, Alliant Reloader 15
.30-06 Springfieldalso used: Winchester 748, N530, 5744
.243 Winchesteralso used: N530, Accurate 2520, RS52
Similar burn rate
Supply & handling
- Availability (US)
- Common
- Shortage-prone
- No
- Suppressor-friendly
- Yes
- Flash-suppressed
- No
About this powder
IMR 4166 is part of the modern Enduron series, bringing temperature stability and copper fouling reduction to the medium-slow rifle powder category. A solid choice for .270 Win, .30-06, and similar cartridges where year-round hunting demands consistent velocity from cold morning to warm afternoon.