The RCBS Powder Baffle (Model 90225) is a drop-in reloading accessory designed to improve the volumetric consistency of standard RCBS powder measures. In standard volumetric reservoirs, the weight of the propellant column creates changing "head pressure" over the lower metering cylinder as the powder level drops from full to empty. Manufactured from stamped sheet steel, this passive mechanical baffle spans the interior of the reservoir hopper to distribute the propellant's downward weight evenly across its angled surface, maintaining uniform gravity flow and consistent charge weights from the first throw to the last.

Key Features

• Consistent Head Pressure: Distributes propellant weight across an angled steel surface to maintain uniform gravity feed to the metering chamber, preventing charge weight drift as the reservoir empties.
• Drop-In Installation: Inserts directly into the base of the hopper reservoir without requiring tools, fasteners, or permanent modifications.
• Broad Propellant Compatibility: Functions with standard smokeless propellants, including flake, ball/spherical, and extruded/stick powders.
• Uniflow Line Integration: Engineered specifically to fit the internal hopper diameter of RCBS Uniflow Powder Measure models, including UPM 1, UPM 2, UPM 3, and UPM Competition measures.
• Passive Mechanical Operation: Requires no electrical connection, external power supply, or electronic calibration.

Specifications

• Product Type: Powder measure baffle
• Manufacturer Part Number (MPN): 90225
• Material: Stamped sheet steel
• Packaged Weight: Approximately 0.122 lbs (~55 g)
• Power Requirements: None (manual passive component)
• Measure Compatibility: RCBS Uniflow Powder Measures (UPM 1, UPM 2, UPM 3, and UPM Competition)
• Propellant Restrictions: Smokeless powders only; strictly not for use with black powder

Who is the RCBS Powder Baffle for?

• Precision metallic cartridge handloaders — requires consistent volumetric throws across long loading strings, using this ~55 g stamped steel powder baffle to eliminate head pressure variations inside RCBS Uniflow hoppers.
• High-volume reloaders — relies on maintaining uniform gravity feed across full reservoir drawdowns without manual powder level management, utilising this 0.122 lb powder measure baffle to stabilise charge weights.

Less suitable for: Reloaders charging cases with black powder due to ignition hazards, or those requiring sub-0.1-grain absolute precision with coarse extruded propellants, who are better served by dedicated electronic trickler/dispenser systems or black-powder-rated measures.