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Old January 8, 2009, 05:28 PM   #3
Senior Member
Join Date: April 23, 2007
Location: Pennsylvania, USA
Posts: 1,913
1/2 is about right. The black on the NRA SR is 13" at 200yds and 6 3/8" on the SR1, which is the SR reduced for 100yds.

Here's a spreadsheet for determining the dimensions of reduced targets -

The actual formula incorporates the bullet diameter.
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