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So, smaller than a full-size IPSC target (so more E Silhouette size)? Or is the 20" in reference to the width, and not height? Just trying to see what size target I should be practicing on/getting dope for. According to Hornady's ballistic calculator (2700 FPS, .243 coefficient & 55 gr. for XM193, 3.1 inches height over bore for sight, 109 yard zero), at 500 yards, my shot's are going to be ~80 inches low if I use my SBR; might have to dial for elevation there (if I even have that much adjustment, does anyone know?). Worse comes to worse, I suppose I could use my 14.5" and maybe borrow a variable, I guess, but that just like CDI, you know?