Which burns faster, AR 2218 or Retumbo?

Retumbo is the faster-burning of the two (rank #78 vs #78 — lower rank burns faster).

What cartridges do AR 2218 and Retumbo both load?

Both powders are listed for .300 Remington Ultra Magnum, .30-378 Weatherby 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

Identical formulation — use same charge weights.

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

Can I substitute AR 2218 for Retumbo?: Identical formulation — use same charge weights. Confidence: Manufacturer. Always start at published minimum charges and work up.
Which burns faster, AR 2218 or Retumbo?: Retumbo is the faster-burning of the two (rank #78 vs #78 — lower rank burns faster).
What cartridges do AR 2218 and Retumbo both load?: Both powders are listed for .300 Remington Ultra Magnum, .30-378 Weatherby Magnum, .338 Lapua Magnum.