Forster Neck Tension Gage NTG-338
Essential reloading inspection tool for .338 caliber brass. Measures inside neck diameter after sizing to ensure consistent bullet seating and detect shoulder donuts. Four stepped gauges help optimize neck tension.
Precision Neck Inspection for Consistent Reloads
The Forster Neck Tension Gage is a straightforward but essential tool for serious reloaders who demand consistency. This inspection gauge helps you verify that your case preparation is producing the precise neck dimensions needed for reliable bullet seating.
How It Works
After you've sized your case necks and before you seat bullets, insert the stepped end of the gage into the case neck. The tool features four progressively larger diameter steps, each clearly etched with its measurement. Slide the gage in until one diameter achieves a slip fit—that measurement tells you your actual inside neck diameter.
Why This Matters
Consistent Neck Tension — Uniform inside neck diameter translates directly to consistent bullet release, which improves accuracy and velocity uniformity.
Detect Defects — The gage reveals whether a "donut" has formed at the neck-shoulder junction, a common problem that compromises case integrity and can cause dangerous pressure spikes.
Fine-Tune Your Process — Armed with actual measurements, you can adjust your sizing dies or neck-turning procedures to achieve the optimal dimensions your rifle demands.
Caliber-Specific Design
This model is calibrated specifically for .338 caliber cases. Available in other calibers for different cartridges.
Simple, durable, and effective—the kind of tool that separates careful reloaders from casual ones.
