They've had an extensive selection of loaded shotgun ammunition every time I've been there. I purchased several boxes of their 2¼" low recoil 12 bore buckshot for my 2½" B.S.A. double gun.Outdoorsman Sport Shop, 1010 S State Rd 135, Greenwood, Indiana 46143. 317-881-7446
Where I just purchased my last pound of black powderI get mine at Tomlinson's Shooting Supplies at the north edge of Churubusco. Take U.S. 33 going NW out of Ft. Wayne. It's only about 16-18 miles.
Brian's Surplus has Winchester #11 for $11, Rem #12 for $10, and four-wing musket caps - can't remember price on those. It's a long drive for you, but looks pretty close for the OP. He also delivers to the gunshows he attends. The Bedford show was just this past weekend and would have been pretty close for you.Caps are hard to find.