I have used the Maxi Mag +V real successfully in a Win 9422 mag and a Ruger 77/22 mag plus a 10" TC barrel. The two rifles shot about inch and a quarter at 100 yards with 4X scopes. The TC goes about 3/4 of an inch or better at 50 yards.
I've tried using it in revolvers ... it has been real bad there with 25 yard groups as large as 5 inches.
At 100 yards, the results on our ground squirrels is pretty similar to the results from a standard construction, not blitz/tnt/etc, 55 grain soft point from a .223. Not real impressive splatter but absolutely dead.
Tom