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NBRSA Records

An easy question except that I don't know the answer. In looking at the records on the NBRSA website the five shot, 100yd., groups records are in inches and all further entries have no measurement notation. I'm assuming the balance of the records are in inches. Is my assumption correct? The reason I ask is that if you look at the 5x5 aggregate records at 100, 200 and 300yds. the expansion, as the distance increases, of the group sizes are not remotely lineal in each rifle class.

That is to say that if an aggregate at 100 is .15" than one would expect the aggregate at 200 to be approximately .30". Such is not the case. What do BR shooters attribute this to?
 
Scores for aggregates fired at 200 yards are divided by two so that they may be averaged with the scores for the 100 yard aggregate. Normally the match results will list each individual group measurement as is, and aggregates for 200 yards are the average of 5 groups divided by two. I'm not sure how they record 300 yard aggregates.
 

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