When I recently ordered a batch of (green) B-27s from Law Enforcement Targets, I also bought some of their reduced-size B-29 targets. They are virtually identical to the B-27 in terms of shape and scoring rings, but only about 44% the size. They are of course less expensive for practice purposes and fit nicely on single electric target carriers.
For the sake of simplicity, at 7 yards the B-29 targets virtually duplicate the sight picture of the B-27s at 15 yards. And make it easier for those of us with 50+ year-old eyes to be able to more quickly see the similarly-located bullet holes.