The World’s First Rim Thickness Gauge for Centerfire Rifle Cartridges.

Measurements the RPG Tool Has to Offer:

• Rim Thickness
• Primer Pocket Depth (from Rim)
• Primer Pocket Depth (from Case Head)
• Seated Primer Depth (from Case Head)
• Seated Primer Depth (from Rim)
• Primer Height
• Firing Pin Protrusion

Uses Mitutoyo 543-793B-10 digital indicator (not supplied).

Small and Large Primer Plates are Included.

Rabbit Hole Precision Rim and Primer Gauge

The RPG is our bread and butter, and the first of all great things to come. This tool is the World’s First Rim Thickness Gauge for centerfire rifle cartridges. Using this tool to sort brass by rim thickness will allow you to get the most uniform primer seating you have ever experienced with using any micro adjust primer seater (handheld or benchtop).

With a simple switch of Adaptor Plates, the same tool can be used for precise measurements of: primer pocket depth, seated primer depth, rim-to-pocket depth, rim-to-seated-primer, primer height on granite surface plate, and firing pin protrusion.

There are 3 Types of Adapter Plates: Rim, Case Head, and Primer Plates. The Rim and Case Head Plates are specific in size to bolt face diameter, are sold in sets and available in 4 Sizes. The Primer Plates are needed for measuring seated primers, primer pocket depth, and more. 

Adapter Plates Can Be Found Here