• Sinclair Shoulder Bump Gauge Insert #20A 20 Degree .338 Lapua
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Sinclair International

Sinclair Shoulder Bump Gauge Insert #20A 20 Degree .338 Lapua

Sinclair Shoulder Bump Gauge Insert #20A 20 Degree .338 Lapua

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The Sinclair Shoulder Bump Gauge Insert #20A is a precision reloading tool made for .338 Lapua cartridge cases with a 20-degree shoulder angle. It measures shoulder setback so you can control case sizing and keep chambering consistent in .338 Lapua firearms.

The insert is precision machined for accurate measurements and works with Sinclair bump gauge systems, making it a direct addition to an existing precision reloading setup.

Key Features

Brand Sinclair International
Product Type Shoulder Bump Gauge Insert
Model #20A
Caliber .338 Lapua
Shoulder Angle 20 Degree
Compatibility Sinclair bump gauge systems
Condition New

Compatibility

Fits .338 Lapua cartridge cases with a 20-degree shoulder angle and works with Sinclair bump gauge systems.

How to use

Install the #20A insert into a compatible Sinclair bump gauge system, then use it to measure shoulder setback on .338 Lapua cases. Adjust your sizing die until the measured setback matches your target.

Frequently asked questions

What cartridge does the Sinclair Shoulder Bump Gauge Insert #20A fit?

It is designed for .338 Lapua cartridge cases.

What shoulder angle does this insert measure?

It is made for a 20-degree shoulder angle.

What bump gauge system is this insert compatible with?

It works with Sinclair bump gauge systems.

What is the purpose of a shoulder bump gauge insert?

It measures and controls cartridge case shoulder setback for consistent chambering.

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