Hi,
I've made my own, that I swear by.
I've discovered that a black square of the ratio of 1" per 10 yards of distance puts the perfect size black target centered and "squared" just above your perfectly aligned front and rear handgun sights.
Thus, I use homemade sheets containing five 1" squares for shooting at 10 yards, two 3" black squares on a sheet of paper for 25 yards, and a 5" black square for fifty yards.
These are perfect for red dot sighted guns too!
Sometimes I also paste a florescent orange target circle, of the same diameter, for they packs of stick on Birchwood-Casey targets. These work really great for handguns with black on black front/rear sights!
Here are a few examples when I was testing a new (for me) 1964 J frame that I'd just purchased in the fall of last year. Targets were shot at 10 and 25 yards.
I'd be glad to email the Windows Publisher files to anyone interested in printing their own.
Square targets truly allow better horizontal alignment of the sights . . . as well as perfectly centering the sights side to side too, when the square appears only slightly wider than the sights do!
Also . . .
Here's a 50 yard version, when checking my Holosight for deer season, standing/unsupported at 50 yards. Again, very easy to center a red dot in a black square. NOTE: The edges of the notebook-sized sheet of paper was cropped before I uploaded this 5" square.
ALSO, I deliberately sight 2 1/2" high at 50 yards (top of the square) so the handgun will be good for all ranges encountered out to 100 yards on the 6" kill zone of a deer. Those 300 grain hardcast flatnose bullets are accurate and really thump 'em at all ranges where one can make a humane shot:
Hope this helps,
Tom