Hornady Lock-N-Load® OAL Gauge Curved
To use the L-N-L O.A.L. Gauge, you will need to purchase a Modified Case to fit your firearm’s chamber and thread it onto the Gauge. For all autoloader, lever-action, or pump-action rifles. Also fits all bolt-action and single-shot firearms. Inserts into chamber through ejection port.
Hornady Lock-N-Load® OAL Gauge Straight
To use the L-N-L O.A.L. Gauge, you will need to purchase a Modified Case to fit your firearm’s chamber and thread it onto the Gauge. For all bolt action and single-shot firearms, or any firearm with straight-line access to the chamber. This model is preferred, as it is most precise and user friendly.