Which burns faster, H1000 or IMR 7977?

H1000 is the faster-burning of the two (rank #76 vs #80 — lower rank burns faster).

What cartridges do H1000 and IMR 7977 both load?

Both powders are listed for .300 Winchester Magnum, 7mm Remington Magnum, .338 Lapua Magnum.

Powder head-to-head

Both powders on one page: burn-rate position, temperature sensitivity and the 3 cartridges they share, with the substitution note from the reference.

FastestSlowest

ADI-based Enduron powder; very similar burn rate to H1000. Use published data for each powder.

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

Can I substitute H1000 for IMR 7977?: ADI-based Enduron powder; very similar burn rate to H1000. Use published data for each powder. Confidence: Published. Always start at published minimum charges and work up.
Which burns faster, H1000 or IMR 7977?: H1000 is the faster-burning of the two (rank #76 vs #80 — lower rank burns faster).
What cartridges do H1000 and IMR 7977 both load?: Both powders are listed for .300 Winchester Magnum, 7mm Remington Magnum, .338 Lapua Magnum.