Lyman Primer Pocket Uniformer Sml

The Lyman Primer Pocket Uniformer Sml cuts small primer pockets to a uniform depth and squares the seating surface for the primer anvil. The tool uses a factory-set stop collar based on SAAMI specifications, so the cutter establishes the pocket depth without manual adjustment. Lyman specifies this small model for both rifle and pistol cases.

Consistent primer pocket depth can help provide more uniform primer seating. In turn, consistent seating can support more consistent ignition. Therefore, this tool provides a dedicated case-preparation step for reloaders who want greater consistency between prepared cases.

Lyman identifies the small uniformer as part #7810218. It forms part of Lyman’s range of primer-pocket preparation tools, alongside small and large cleaners and reamers.

Lyman Primer Pocket Uniformer Sml Features

First, the cutter removes material from the bottom of the pocket until the case head contacts the stop collar. This controls the cutting depth and provides a repeatable result when you hold the case and tool correctly.

In addition, the cutter squares the seating surface for the primer anvil. As a result, the primer has a more consistent surface against which the anvil can rest. Lyman states that variations in pocket depth and configuration can affect primer ignition and may affect cartridge accuracy.

Furthermore, the factory-set stop collar removes the need to set the cutting depth manually. Lyman specifically states that the uniformer comes factory set to S.A.A.M.I. specifications and that no adjustment should be attempted.

The small version works with both rifle and pistol cases. However, it performs a different job from a primer-pocket cleaner or reamer. A cleaner removes fouling from the pocket, while a reamer removes military crimps and rough metal edges. The uniformer instead controls pocket depth and squares the seating surface.

For additional case-preparation equipment, see the case preparation equipment. You can also review the manufacturer information for the wider range of Lyman tools.

Using the Tool

Start with an empty, deprimed case and confirm that it has a small primer pocket. Then insert the cutter into the pocket while keeping the case straight in line with the tool.

Next, turn the cutter clockwise while applying pressure. Continue until the case head contacts the stop collar squarely. Afterward, remove the cutter and inspect the pocket for brass shavings. Remove any remaining shavings before continuing with case preparation.

If the cutter removes no material, the pocket has already reached the required depth. Consequently, you should not force the cutter or attempt to alter the stop collar.

Military cases can present a different situation because they may have crimped-in primers. In that case, use a suitable primer-pocket reamer first to remove the crimp. Afterward, use the uniformer to establish the pocket depth.

Finally, inspect the prepared pocket before seating a primer. Check that the pocket contains no loose brass and that the seating surface looks clean and even.

Specifications

Overall, the Lyman Primer Pocket Uniformer Sml provides a controlled way to prepare small primer pockets to a consistent depth. Its fixed stop collar controls the cutting depth, while the cutter squares the seating surface for the primer anvil. Consequently, it provides a repeatable option for detailed case preparation.