Well I'm going to a shoot hosted by a member here next weekend and wanted to test out JBM calculations drop chart for my rifle. Here's what I got. All groups were shot form a bench with sand bags but the 400 and 500 yard groups were from the roof of my truck while I was sitting in the bed on a chair lol. Not the most stable platform but I had to get some elevation to get above the corn stalks and small hill in the field. This is the first time I've shot on paper past 200 yards. I could have gotten better groups at 300 and 400 as I only shot one group and moved the target. The load is out of my .223 savage 12 with a 24" Addams and Bennet barrel 1:14. The action has been glass bedded and the barrel is free floated. The load was 25.6 gr. of Benchmark powder with a 40gr. V-Max on top seated to 2.222. The MV= 3654. Primers are CCI 400. The case was 5.56x45 NATO trimmed, flash hole deburred, and just used my ID neck reamer to take out the military crimp. The head stamp says "NPA 66". I think it's some jap case that was made in 1966. Never heard of them though.

100 Yard: The rifle was zero'd right on at 100 but it shot about 1/8 - 1/4 high after I dialed it up to 500 then back down. This group was shot to confirm zero again but was a little high. Not sure what happened here. Maybe my scope wasn't tracking right or I just fudged up when I reset the turret. Not a huge problem though.
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/100yards.jpg[/img]
200 Yard:
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/200yards.jpg[/img]
300 Yard:
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/300yards.jpg[/img]
400 Yard: This is still a fairly decent group but I kept adjusting the windage as the wind picked up. I should have just left it alone.
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/400yards.jpg[/img]
500 Yard:
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/500OK.jpg[/img]
Best 500 Yard Group:
[img width=600 height=450]http://i681.photobucket.com/albums/vv171/DennisH87/500YardsBest.jpg[/img]

The JBM calculations were right on the money except at 500 yards. It may have been slightly over 500 because my range finder only goes to 440 so I had to guess about where 500 was.