Is it still possible to buy this particular target anywhere?
The NRA 50-yard slow fire pistol target (B6) has the same dimensions, apart from the addition of an X-ring, and it only goes out to the 5 ring.
50 yard slow fire Standard American Target - 8, 9 and 10
rings black. Target No. B-6, B-6(T) is Tag board, B-6(P) is Paper
and 6(C) is Repair Center.
X ring ......................1.695 in
10 ring .....................3.36 in
9 ring .......................5.54 in
8 ring .......................8.00 in
7 ring .....................11.00 in
6 ring .....................14.80 in
5 ring .....................19.68 in