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MAIN FEATURES & SPECIFICATIONS
• Threaded Hopper
• Quick Change Hopper Drain
• Ambidextrous design
• Hopper Volume ~ ½ lb. Powder
• Metering Range:
• Alliant Reloder 22 Extruded Powder = 97.0 grains – 3.0 grains
• Alliant 300-MP Ball Powder = 106.0 grains – 0.5 grains
ASSEMBLY
To prepare the Uniflow Powder Measure-3,
first disassemble unit completely and clean
thoroughly. To do this, first remove the plastic
hopper, by rotating in a counterclockwise
direction. Remove the three parts bags
contained within the hopper. Remove
the black rubber stopper inserted in the
Metering cylinder and carefully slide the
cylinder out of the main casting. Open the
three parts bags and verify you have all
components as shown in the three photos
(right).
Start by cleaning the main casting,
concentrating on all areas that will be
exposed to powder. RCBS makes a Weapons
Cleaning Solution, #87059 which is great for
cleaning parts, both metallic and plastic, and
leaves a dry rust preventive protective layer
on parts protecting from oxidation; however,
any mild cleaning solvent will work as long
as it does not leave behind an oily residue.
Continue to clean the remaining metallic
components, ensuring to remove all oily
residue. Once all components are clean and
dry the UPM-3 is ready to be assembled.
Carefully insert the Metering Cylinder into the Machined Casting. The fit between these
two components is very tight it helps to rotate the cylinder while inserting into the
Machined Casting. DO NOT force as this can damage the Metering Cylinder. The Metering
Cylinder has three 10-32 threaded holes on one side and one larger 3/8-24 threaded hole
on the opposite side. The 10-32 threaded holes are where the Handle will be installed, keep
this in mind when installing Cylinder. The UPM-3 can be set up for left or right-handed
operation, the photo (right) shows right handed operation.
Insert Metering Screw Assembly. Before
assembly make sure the Metering
Screw is threaded all the way down in
the Bushing Assembly as shown (below,
left), this is not necessary, but aids in
assembly. Ensure flat edge of metering
screw is aligned with cross hole in
Bushing as shown (below, right).
Metering Screw threaded into Bushing
Insert the Metering Screw Assembly into the Metering Cylinder. Ensure the 3/8" hole in
the Metering Screw Assembly is aligned with the 3/8-24 threaded hole in the Metering
Cylinder as shown. Insert the 3/8-24 Brass Lock Screw into Metering Cylinder. The flat nose
of the lock screw needs to contact the flat on the Metering Screw. Tighten the Lock Screw
enough to prevent the Metering Screw from rotating. DO NOT overtighten. The Metering
Screw should advance in or out by rotating the Cylinder Bushing Assembly, if it does not
loosen the Lock Screw slightly to allow Screw to advance in or out. NOTE: THE METERING
SCREW SHOULD NOT ROTATE, IF IT DOES, THE BRASS LOCK SCREW IS NOT THREADED
IN COMPLETELY. THE FLAT ON THE METERING SCREW SHOULD ALWAYS BE FACING THE
BRASS LOCK SCREW.
Counterclockwise rotation of the Cylinder Bushing Assembly will advance the Metering
Screw inwards, reducing the volume and reducing the metered weight. Clockwise rotation
of the Cylinder Bushing Assembly will advance the Metering Screw outwards, increasing
the volume and increasing the metered weight.
BAG 1: Metering Screw Assembly
BAG 2: Drain Tube Attachment
BAG 3: Misc. Parts
Insert Metering Cylinder into Machined Casting
Metering Screw properly aligned
Correct Alignment
Next step is to install the Handle Assembly. Using a 1/8" hex wrench and the two 10-32 x
3/8" button head cap screws secure the Handle Assembly to the Metering Cylinder. The
Handle can be positioned in either "handle down" or "handle up" orientation, depending
on the user's preference. See photos (below) for both orientations.
"Handle Down" Orientation
Once the Metering Screw Assembly and Handle have been installed, place the UPM-3
into the included UPM Stand Plate or the RCBS Advanced Powder Measure Stand, (not
included), and thread the 7/8-14 Lock Ring onto Powder Measure to secure to the Plate
or Stand. Next, thread the UPM-3 Hopper into the top of the UPM-3 and place the Cap on
top of the Hopper. If user preference is to dispense metered powder directly from UPM-
3 into a cartridge case, install either the large or small Powder Measure Drop Tube. The
small drop tube has the smaller diameter hole and will accommodate cartridge cases
ranging from .22 to 7mm and the large drop tube has the larger diameter hole and will
accommodate cartridge case from .30 to 45 caliber. An optional .17-.20 caliber drop tube
#9028, not included, is available from your RCBS dealer or can be purchased directly from RCBS
at RCBS.com
Filling Metering Cylinder
Dispensing Metered Charge
(Handle Up)
USE
The RCBS Uniflow Powder Measure-3 (UPM-3) is a volumetric powder measuring device,
which measures powder by volume, not by weight. With cycling of the handle, the UPM-3
will measure powder efficiently and effectively to within a fraction of a grain. The benefit of
UPM-3, is that with the use of the included drop tubes, the powder can be measured and
dispensed directly into the cartridge case, saving valuable time.
When using a volumetric powder measure, such as the UPM-3, it is important to note
that before dispensing powder into your cartridge case it is imperative that the device be
disassembled and cleaned and dried thoroughly, as previously mentioned, to ensure all
residual oil, rust preventative or moisture has been removed. This is extremely important
as any oil or moisture will attract and hold powder causing inaccurate dispensed charge
weights. It is also recommended to wipe down any plastic components with a dryer
sheet or an anti-static spray to eliminate any static charge that has built up on the plastic
components which can attract and hold powder.
To increase or reduce metered charge weight, adjust the Metering Screw by advancing in
to reduce weight or out to increase weight. This is done by first loosening the Brass Lock
Screw. Note: only break loose the Brass Lock Screw, rotate only 1/16th of a turn, just enough to
ensure screw advances in and out smoothly.
3
Lock Screw Installed
"Handle Up" Orientation
Powder Measure with Drop
(Handle Down)
Tube installed
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