21st Century - Primer Pocket Plug/O Rings Type:Rings allow quick estimates of the

allow quick estimates of the distance to your target with known dimensions

The spotter is also tripod adaptable

These are common sizes that reloaders use to ream their cases just before seating bullets

Resistant to solvents

Also fits all bolt-action and single-shot firearms

21st Century - Primer Pocket Plug/O Rings Type:Rings allow quick estimates of theWeighing is a technique used to sort cases based on volume. By plugging the primer pocket, the case can be set on a precise electronic scale, filled with water and weighed. Subtracting the weight of the case and the plug from this measurement gives us the weight of the water in the case (a direct indicator of volume, no math necessary here) and the sorting process can begin.