"Bickers" Scoring Gauge?

[Andre]

Tonight at my rifle club, the junior coach and club president brought up the subject of Bickers scoring gauges, and a Bickers match that used to be held at the club. Apparently this gauge is .005" smaller than the 9 ring on an a17 target, and it checks to see if your shot is within .0025" of perfect center.

Being a machinist with capability to build such a gauge easily from hardened tool steel, I'm up for the project.

Does anybody have dimensions for such a gauge? I would measure a target, and have the capability to optically measure one (using a 50x surface magnifying comparator with an etched measuring lens), however I have no clue how accurate these targets are, and don't want to "stack tolerances" in case I sample a bad batch of targets.

Andre

[Tim S]

Have you looked in the NRA Rulebook. NSRA and ISSF rules books both specify target dimensions, so it would be likely the US NRA does too.