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Hodgdon Powder Company · Extruded

IMR 4451

Enduron series temperature-insensitive IMR powder in the H4350 burn rate range.

Manufacturer
IMR
Grain shape
Extruded
Burn rank
#68
Category
Rifle Medium
Temp sensitivity
Low
Application
Rifle
Origin
USA
Status
Discontinued

Burn-rate position

FastestSlowest

Rank #68 on the burn-rate scale · Rifle Medium

Typical cartridges

6.5 Creedmoor.308 Winchester.30-06 Springfield.270 Winchester

Substitutes

Listed substitutions with charge guidance. Always start at published minimums and work up.

H4350 · HodgdonPublished

ADI-based Enduron powder nearly identical to H4350; 1–3% charge adjustment may be needed.

By cartridge

6.5 Creedmooralso used: IMR 3031, N550, Alliant Reloader 15
.308 Winchesteralso used: Shooters World Economy Rifle, Accurate 2230, A1
.30-06 Springfieldalso used: Winchester 748, N530, 5744
.270 Winchesteralso used: Reload Swiss RS60, Winchester 760, S243

Similar burn rate

#68S355Somchem#68Reloader 19Alliant#68Ramshot Big GameRamshot#67IMR 4350IMR#69H4831SCHodgdon

Supply & handling

Availability (US)
Common
Shortage-prone
No
Suppressor-friendly
Yes
Flash-suppressed
No

About this powder

IMR 4451 is part of the Enduron series, offering improved temperature stability over classic IMR 4350. Well-suited for .30-06, 7mm Rem Mag, and .300 Win Mag with mid-to-heavy bullets. The Copper Fouling Eraser additive extends cleaning intervals.

Head-to-headIMR 4451 vs H4350ChartSee it on the burn-rate spectrumBrowseEvery powder, ranked by burn rate

Sources & provenance