The Forster 308 Neck Tension Gage is a purpose-built inspection tool for reloaders working with .30 caliber brass. It provides a fast, repeatable method to screen and sort a batch of cases after neck sizing and before bullet seating. The stepped design helps determine inside neck diameters so reloaders can establish consistent release characteristics. The tool is compact and simple to use: insert the stepped end into the neck and note which diameter achieves a slip fit.
Key Specifications
- Compatible with .30 Caliber case necks.
- The tool features four stepped diameters that increase in size toward the handle.
- Each diameter is etched on the metal tool for quick identification.
- Intended for use after case neck sizing and before bullet seating to determine optimal inside neck diameter.
- Helps detect a donut at the neck-shoulder junction by inspecting inside diameters.
- Available in five calibers across the NTG lineup.
- The listed weight is 0.105 (as provided in product attributes).
- The listed shipping weight is 0.105 (as provided in product attributes).
- Operation is simple: insert the stepped end until one diameter achieves a slip fit and use that value for case preparation.
Well-suited for reloaders focused on consistent, repeatable case preparation, the Forster 308 Neck Tension Gage streamlines inspection and quality control of .30 caliber brass. Its etched, stepped design makes it easy to sort batches and fine-tune neck preparations for dependable seating characteristics.









