The RCBS Trim Mate Primer Pocket Uniformer for large pistol primer pockets (RCBS part no. 90383) is manufactured with carbide cutters that true the primer pocket wall and bottom to a consistent depth and shape. Brass that has been fired and reloaded repeatedly can develop primer pockets that no longer seat a new primer evenly, and this tool corrects that by cutting the pocket back to a uniform standard. Reloaders who prioritize consistent primer seating depth, a real factor in ignition consistency, use pocket uniformers like this one as a standard step in case preparation for large-pistol-primed brass.

Key Specifications

• Sized specifically for large pistol primer pockets.
• Manufactured with carbide cutters for long tool life.
• Trues both the pocket wall and bottom to a consistent depth and shape.
• Constructed from steel.
• Measures approximately 7.1 inches in overall length.
• Ships at approximately 0.0375 lb.
• Sold individually, one uniformer per pack.
• Corrects primer pockets distorted by repeated firing and resizing.
• Helps ensure consistent primer seating depth for reliable ignition.

Frequently Asked Questions

What does a primer pocket uniformer actually fix? It cuts the pocket wall and bottom back to a consistent depth and shape so a new primer seats evenly, which repeated firing and resizing can throw out of true.

What primer pocket size is this tool built for? Large pistol primer pockets specifically.

Buy the RCBS Trim Mate Primer Pocket Uniformer, Large Pistol

Keep large-pistol-primed brass seating primers consistently, batch after batch. Order from RCBS through our case preparation lineup, with fast shipping from our Lubbock, Texas gun shop.