Which burns faster, H322 or IMR 3031?

H322 is the faster-burning of the two (rank #52 vs #56 — lower rank burns faster).

What cartridges do H322 and IMR 3031 both load?

Both powders are listed for .223 Remington, .444 Marlin, .222 Remington, 6.8mm Remington SPC, 6mm BR Norma, .38-55 Winchester.

Powder head-to-head

Both powders on one page: burn-rate position, temperature sensitivity and the 6 cartridges they share, with the substitution note from the reference.

FastestSlowest

Similar burn rate zone; within 3–5% charge weight.

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

Can I substitute H322 for IMR 3031?: Similar burn rate zone; within 3–5% charge weight. Confidence: Published. Always start at published minimum charges and work up.
Which burns faster, H322 or IMR 3031?: H322 is the faster-burning of the two (rank #52 vs #56 — lower rank burns faster).
What cartridges do H322 and IMR 3031 both load?: Both powders are listed for .223 Remington, .444 Marlin, .222 Remington, 6.8mm Remington SPC, 6mm BR Norma, .38-55 Winchester.