Which burns faster, H4350 or IMR 4451?

H4350 is the faster-burning of the two (rank #66 vs #68 — lower rank burns faster).

What cartridges do H4350 and IMR 4451 both load?

Both powders are listed for 6.5 Creedmoor, .308 Winchester, .30-06 Springfield, .270 Winchester.

Powder head-to-head

FastestSlowest

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

Confidence: Published. Always start at published minimums and work up.

Can I substitute H4350 for IMR 4451?: ADI-based Enduron powder nearly identical to H4350; 1–3% charge adjustment may be needed. Confidence: Published. Always start at published minimum charges and work up.
Which burns faster, H4350 or IMR 4451?: H4350 is the faster-burning of the two (rank #66 vs #68 — lower rank burns faster).
What cartridges do H4350 and IMR 4451 both load?: Both powders are listed for 6.5 Creedmoor, .308 Winchester, .30-06 Springfield, .270 Winchester.