it seems like there aren't any designated
shooting areas administered by the Hollister field office, but it seems like you can shoot anywhere they don't say you can't.
There's a lot of BLM land around there, including Condon Creek, Laguna Mountain, and Clear Creek. Clear Creek was closed for asbestos at some point, but it might be open again. From what I understand from the maps, all the BLM land is in South County.
Better maps here.