To the op, I highly recommend you test your loads to find a bullseye load that can hold the 10-ring on the target your using. Anything less is useless!!! When you shoot a 8 or a 9, how would you know if it was you or the ammo?
I like to use the targets with flat squares when testing ammo with iron sights. It wasn't my idea, their was this guy named Keith, he was supposed to be pretty good with a pistol. He designed a couple of bullets and a couple of different calibers for gun mfg's. Maybe you've herd of him???
Well this guy named keith designed these targets to test the bullets/loads/calibers he was working on. I like to use his 100yd targets.
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That 100yd keith target has a 8" black square and the center white square is 4".
Why white center/black outer, the opposite of bulleye targets??? Why square instead of round that is used in bullseye targets??? Because it's easier to line a flat front sight up to a flat line. The white center give you the option to choose which contrast is the clearest to your eyes for the conditions of that day. You can either line up with the top of the sight touching the black or run the site up the black until it cuts/touches the white.
They have a saying in the bullseye community. "Sun up, sights up. Sun down, sights down".
I usually use those targets pictured above when I test loads @ 50ft. That 45acp test load was done from a sitting position using a rest @50ft. The 9mm load was also tested @50ft using a sitting position and a rest. The difference between the 45acp and the 9mm is that I scoped the 9mm. I want to do test loads @50yds with the 9mm and my eyes just aren't good enough to test loads that far away anymore. So instead of putting up a "bullseye" target or a real target to test ammo I opted to scope the 1911 9mm.
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What I'm interested in shooting/using @ the 50yd line in that 1911/9mm is a 150gr hollow based flat round nosed bullet. A test group shot in a contender 9mm bbl testing the accuracy of the bullet.
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I've also just started testing 110gr/1200fps wad cutters for 50yd accuracy. People have had excellent results with 148gr wc's/38spl 1911's.
Why not a 110gr wc 9mm???
Anyway, the ro's bring allot to the table for the $$$$.