Which burns faster, N170 or Retumbo?

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

What cartridges do N170 and Retumbo both load?

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

Powder head-to-head

Both powders on one page: burn-rate position, temperature sensitivity and the 4 cartridges they share, with the substitution note from the reference.

FastestSlowest

N170 #78 · Retumbo #78

Similar burn rate for ultra-magnums; reduce 4–6% when substituting.

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

Can I substitute N170 for Retumbo?: Similar burn rate for ultra-magnums; reduce 4–6% when substituting. Confidence: Community. Always start at published minimum charges and work up.
Which burns faster, N170 or Retumbo?: Retumbo is the faster-burning of the two (rank #78 vs #78 — lower rank burns faster).
What cartridges do N170 and Retumbo both load?: Both powders are listed for .300 Remington Ultra Magnum, .300 Winchester Magnum, .338 Lapua Magnum, 7mm Remington Magnum.