Clark Bros on Rte 15 is my go-to range for working up loads and practicing with small, medium, or big-bore doubles. The longest distance is 100 yards and they are reluctant to let you shoot offhand (except pistols, of course, and clays if you have someone to work the trap).

The shop is sad on decent doubles, as noted, but has a good selection of reloading gear, primers and powders.

Regards