Seating Depth Checker Base #3

These Seating Depth Checker Base Pieces are designed to center and steady the case head while you are making seating depth measurements with your dial caliper and a Davidson SDC Nose piece. The bases have three “steps” machined to match the diameter of three case head sizes – Base #1 includes 222/223, PPC and 308 (.378”, .445”, .473”) case head sizes. Base #2 includes 222/223, 308 and standard belted magnum (.378”, .473” and .532”) case head sizes. Base #3 (.410", .473", .510"). Base #4 (.473", .532", .610"). Many shooters find they can make more consistent seating depth measurements if they use the combination Base and Nose pieces and not have to hold the case head centered on the caliper leg.