The TSS Hexagonal Headspace Datum Shoulder Bump Comparator Tool represents a premium all in one tool, ready for a lifetime of use. This tool functions like the other headspace-shoulder bump comparator measuring tools on the market, but this one combine everything into a rigid one-piece tool made from stainless steel. There are no bushings to swap or lose, and the design protects all critical surfaces from abuse!
How to Use:
Determine the shoulder datum diameter you want to use
Orientate the comparator so that the desired shoulder diameter size is at 6 O’clock, and facing the bottom moveable jaw of the caliper
Move the brass thumb screws to the opposite side of the intended diameter size of the hexagon to engage the fixed top jaw
Snug down brass thumb screws to the fixed top jaw of the caliper
Close the caliper jaws and zero the caliper
Ready for use!
Compatibility:
Features Shoulder Datum Diameter Sizes: .330”, .350”, 375”, .400”, .420” & .445”
This spread is compatible with the majority of common use cartridges and is guaranteed compatible with ~80 SAAMI Spec cartridges.
Care Instructions:
Routinely clean and oil your stainless-steel comparator tool to ensure it remains serviceable and accurate for a lifetime. This is a precision tool and must be cared for accordingly. Stainless steel is corrosion resistant, but can still rust when exposed to elements such as sweat from your hands.
Reloading Comparator Notes:
It should be noted that comparators provide comparative measurements, not absolute measurements. A headspace shoulder datum comparator is the most accurate way to measure shoulder bump for sizing, as it datums similarly to how headspace gauges work. As a result, you can easily and accurately determine the sizing shoulder bump to dial in the exact amount of shoulder bump desired. This allows you to maximize brass life and accuracy of your loads. Note, in some instances, you may be able to measure the shoulder bump of loaded cartridges, but this is all dependent on the length of your bullet.
