If the land is zoned ag then there shouldn't be anything in the law to outright prohibit shooting per se. Most jurisdictions do have various noise and nuisance restrictions though, and you could still have problems if nearby neighbors get irate about noise, safety, etc.
I'm on a little more than five acres in western Hanover. Most folks nearby are on similar sized lots. I can usually do a couple pistol mags during the weekday when the closest neighbors are off to work, but have generally restrained from any prolonged activity or more loud shotgun and rifle. I also belong to nearby Cavalier though, where within a few minutes drive I can do all I want.
Some newcomers to the neighborhood sometimes try more extended blasting (like for a couple of hours or more), including on nice weekends while family types are out in the yard with kids, wives, etc. Won't bother me any but I think they'll get complained at after awhile, since it usually tapers off after the first few times. (Either that or the novelty just wears off.)
Most of the local LE is very pro civilian shooting. Even had a deputy come to speak at our neighborhood crimewatch meeting and suggest we could collectively do some defensive-shooting practice down along our creek. Not all residents were supportive of that idea though.....
Probably just need to judge what level of discretion is appropriate for wherever you're at.
Good luck finding a nice spread!