Which burns faster, IMR 8133 or Retumbo?

Retumbo is the faster-burning of the two (rank #78 vs #83 — lower rank burns faster).

What cartridges do IMR 8133 and Retumbo both load?

Both powders are listed for .338 Lapua Magnum.

Powder head-to-head

FastestSlowest

ADI-based; similar burn rate to Retumbo for ultra-magnum cartridges. Start low.

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

Can I substitute IMR 8133 for Retumbo?: ADI-based; similar burn rate to Retumbo for ultra-magnum cartridges. Start low. Confidence: Published. Always start at published minimum charges and work up.
Which burns faster, IMR 8133 or Retumbo?: Retumbo is the faster-burning of the two (rank #78 vs #83 — lower rank burns faster).
What cartridges do IMR 8133 and Retumbo both load?: Both powders are listed for .338 Lapua Magnum.