#17 17\ Shoulder Bump Gage Insert

The #17 17" Shoulder Bump Gage Insert from Sinclair International is a precision reloading tool designed for handloaders and competitive shooters who demand tight tolerance control over case shoulder dimensions. This insert allows shooters to measure and verify proper shoulder bump—the critical distance between the fired case shoulder and the die—ensuring consistent, safe ammunition that maximizes accuracy and brass longevity.

Whether you're loading for precision rifle competition, hunting, or tactical applications, proper shoulder bump is non-negotiable for repeatable performance. The #17 insert is engineered to work with five critical rifle calibers: 25-06 Remington, 270 Winchester, 280 Remington, 30-06 Springfield, and 7.62×39mm, making it a versatile addition to any serious handloader's bench. By allowing you to measure shoulder bump in increments as small as 0.001 inch, this tool ensures your resized cases maintain precise headspace geometry, preventing dangerous pressure spikes while preserving case life across multiple reloading cycles.

Competitive reloaders, precision rifle shooters, and law enforcement/military armorers benefit most from this insert when standardizing ammunition for accuracy-critical platforms. Installation is straightforward: the insert mounts into a standard reloading press frame, enabling direct measurement without the need for expensive separate equipment.