Hodgdon Powder Company · Extruded
Retumbo
Ultra-slow extruded powder for large magnum rifle cases.
- Manufacturer
- Hodgdon
- Grain shape
- Extruded
- Burn rank
- #78
- Category
- Magnum Rifle
- Temp sensitivity
- Moderate
- Application
- Magnum Rifle
- Origin
- USA
- Status
- Active
Burn-rate position
Typical cartridges
.300 Winchester Magnum, .300 Remington Ultra Magnum, .30-378 Weatherby Magnum, 7mm Remington Magnum, .338 Lapua Magnum
Substitutes
Listed substitutions with charge guidance. Always start at published minimums and work up.
Identical formulation — use same charge weights.
ADI-based; similar burn rate to Retumbo for ultra-magnum cartridges. Start low.
Similar burn rate; reduce 3–5% when substituting.
Similar burn rate for ultra-magnums; reduce 4–6% when substituting.
By cartridge
Similar burn rate
Supply & handling
- Availability (US)
- Common
- Shortage-prone
- No
- Suppressor-friendly
- Yes
- Flash-suppressed
- No
About this powder
Retumbo (the name is "Retumbo" — a portmanteau of "return to magnums" or simply an invented name) is the slowest of the Hodgdon Extreme series, designed for the .338 Lapua, .300 Ultra Mag, .30-378 Wby, and similarly large cases. Its temperature stability makes it a staple for ELR (extreme long range) competitors who need consistency from 20°F to 100°F.