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With the temperatures dipping down into the 80s, I decided to go back out to the range with my C308 rifle. It had been 48 days since I last got to shoot it; 65 days since I shot it using just the iron sights. I was shooting PPU ammunition.

I printed off a few Army Qualification test (AQT) targets on 8 1/2 x 11 inch paper. At this scale, the target is supposed to represent the full-size target at the following distances: 25 yds = 100 yds; 50 yds = 200 yds; 75 yds = 300 yds; 100 yds = 400 yds. And, for those who might be curious, the 3 silhouette is 8 1/4 inches wide by 7 5/8 inches tall; the 4 silhouette is 6 1/4 by 4 1/8; the 5 silhouette is 4 1/4 by 3 1/16; and, the V circle has a 1 1/4 inch diameter.

I shot the first target while standing and the rest of the targets while sitting, using a gun rest on a table. I fired 10 shots at each target, but did not check my hits until after the last shot. I scored 47 out of 50 on the 25/100 yd target (photo 1). I scored 26 out of 50 on the 50/200 yd target (photo 2). It was my tightest group, but I apparently got a three inch rise going from 25 to 50 yds?! (If I could move that group down, I would have scored 47 out of 50 again.) I scored 37 out of 50 on the 75/300 yd target (photo 3), and 20 out of 50 on the 100/400 yd target (photo 4).
 

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I may not have the terminology correct, but you may be seeing the effect of a "battle site zero" whereby the rifle is zero at 25 yards and then zero again at 300 (or 20 and 200, whatever)? If you already had this under consideration my apologies.

Battle Sight Zero
 

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[Y]ou may be seeing the effect of a "battle site zero" whereby the rifle is zero at 25 yards and then zero again at 300 (or 20 and 200, whatever)?
I think I am. However, I read that with the .308 round, a BSZ of 25 meters gave you a three inch rise at 100 (not 50) yds, and then back to zero at 200 yds. Aim small, miss small.
 
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It is possible that shooting from different positions also could have caused the shift up, since things like your cheek weld and grip could have changed too.
 
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With the temperatures dipping down into the 80s, I decided to go back out to the range with my C308 rifle. It had been 48 days since I last got to shoot it; 65 days since I shot it using just the iron sights. I was shooting PPU ammunition.

I printed off a few Army Qualification test (AQT) targets on 8 1/2 x 11 inch paper. At this scale, the target is supposed to represent the full-size target at the following distances: 25 yds = 100 yds; 50 yds = 200 yds; 75 yds = 300 yds; 100 yds = 400 yds. And, for those who might be curious, the 3 silhouette is 8 1/4 inches wide by 7 5/8 inches tall; the 4 silhouette is 6 1/4 by 4 1/8; the 5 silhouette is 4 1/4 by 3 1/16; and, the V circle has a 1 1/4 inch diameter.

I shot the first target while standing and the rest of the targets while sitting, using a gun rest on a table. I fired 10 shots at each target, but did not check my hits until after the last shot. I scored 47 out of 50 on the 25/100 yd target (photo 1). I scored 26 out of 50 on the 50/200 yd target (photo 2). It was my tightest group, but I apparently got a three inch rise going from 25 to 50 yds?! (If I could move that group down, I would have scored 47 out of 50 again.) I scored 37 out of 50 on the 75/300 yd target (photo 3), and 20 out of 50 on the 100/400 yd target (photo 4).
Nice shooting man.
 
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