Hi Guys,
I have started shooting my targets for the 100 shot 22 RF Outdoor Benchrest for score event. In looking at the current rule book I see that the scoring is something I'm not familiar with, Section 1.10 page 6 says, 

"The exact center of the shot hole touching the scoring ring will receive the higher value".   

My dumb question for this week.
How does one determine if the  "exact center"  of the shot hole is touching a scoring ring, is there a special device, gauge, overlay, for this and if so does ASSRA sell them.

I've scored a lot of targets over the years, both out side type scoring, in side type scoring, and group scoring, always did this with a scoring overlay, plug gauge, or a caliper, but have never had to figure out where the  "exact center"  of a hole was in relation to a scoring ring. 
   Shooter

Years ago (about 1990)I made up an overlay to score the benchrest targets for our club.  Various size circles (.22 through .45) were mechanically drawn. with a dot in the exact center of the circle.  This was photocopied onto clear sheets.  In use, a clean target is laid onto the table, and the target to be scored is laid on top, and all scoring rings are lined up.  The scoring aid is then laid on top of the bullet hole in question, and centered on the hole.  (Think of looking through a peep sight at a bull - the circles are easy to center.)  Then observe where the dot in the center of the circle is in relation to the scoring ring.

I have passed out a few of these to schuetzenmeisters over the years, and even the ISSA people incorporated the idea into their overlays which originally just had a curved line in them.   

Jerry

All the ISSA and ASSRA matches I have shot the .22 bench matches use the leaded edge not the center. The Center fire matches use the center and between the overlays and the punches hole you can get a pretty accurate in or out.

Shooter, I would think the best way would be to plug the hole with a standard .22 rf plug as sold by the NRA (made by RIG, et al) and look for the magnified edge of the bullet image to see whether the ring pierces the center or further in.   

Of course with cf, the proper diameter bullet can be cut (milled) in half and the half bullet used as a plug.  I don't think that would be very practical for rf, however.

HTH ~ Froggie

Brent

Don't know what kind of printer you are using, but the copies are still round on mine.  (Did a lot of testing for distortion plus the dot being in the center of the circle, and couldn't see any error.)

Green Frog

Best to stay away from plugs - good way to distort the hole in the target - seen this done both intentionally and unintentionally.  If used to determine whether the bullet hole CUTS the next scoring ring, they're fine, but that's not what we are doing in scoring ASSRA (and most ISSA) matches.  Again.  We're looking at the center of the bullet hole in relation to the edge of the scoring ring in benchrest.  In offhand, it's the LEADED edge of the bullet hole touching the scoring ring.  This latter is a visual thing - best observed if not sure by getting out the magnifing glass.  That's why the scoring rings are white - usually easy to see the leaded edge of the bullet hole. If you push a bullet through the hole, and the hole cuts the ring (as would a plug), that's not the leaded edge.

As bnice points out, the ISSA scores both bench and offhand targets in the .22 RF matches from the leaded edge.  By ASSRA rules, bench is bench, and is scored by the center of the hole.

Shooter_1 if you would like an overlay, contact me by e-mail.

Jerry