What can I substitute for IMR 4451?

Substitutes listed for IMR 4451: H4350. Always start at published minimum charges and work up — substitution is a starting point, not a 1:1 swap.

Is IMR 4451 good for 6.5 Creedmoor?

IMR 4451 is commonly listed for 6.5 Creedmoor (burn-rate rank #68). Other powders reloaders use for 6.5 Creedmoor include IMR 3031, N135, N550. Verify charges against a published load manual.

Is IMR 4451 good for .30-06 Springfield?

IMR 4451 is commonly listed for .30-06 Springfield (burn-rate rank #68). Other powders reloaders use for .30-06 Springfield include N110, Winchester 748, N530. Verify charges against a published load manual.

Is IMR 4451 good for .308 Winchester?

IMR 4451 is commonly listed for .308 Winchester (burn-rate rank #68). Other powders reloaders use for .308 Winchester include N110, Shooters World Economy Rifle, Accurate 2230. Verify charges against a published load manual.

Lindcott Armory

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, .30-06 Springfield, .308 Winchester, .270 Winchester

Substitutes

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

H4350 · Hodgdon Published

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

By cartridge

6.5 Creedmoor also used: IMR 3031, N135, N550

.30-06 Springfield also used: N110, Winchester 748, N530

.308 Winchester also used: N110, Shooters World Economy Rifle, Accurate 2230

.270 Winchester also 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 H4350 ChartSee it on the burn-rate spectrum BrowseEvery powder, ranked by burn rate

Sources & provenance

Manufacturer IMR — IMR — published load/burn-rate data archived