Do you own any sort of a deer rifle? If so, get a scope on it and 300 or so rounds of ammo. Get the scope mounted and be able to hit a man size target at 400 yards.
A shotgun is fine at up the 50 feet or down a hall or across the yard but much farther than that is an iffy proposition. And I think it stands to reason that if you don’t have a handgun, then get one. A 9mm, 40 or 45 acp handgun with at least a ten round magazine is best. I dont live out there but if I did Id be carrying my Glock 19 9mm pistol.
No, but I've got an H&K G3, rebuilt on a semiauto only receiver. It has a scope mounted and I have at least 5-600 rounds of ammo for it. I'm not quite that good yet. 200 yards, maybe 300.
I've also got 2 .45 ACP pistols, a "serious social purposes" shotgun, an M4 semi-auto clone (5.56), an M1 Carbine and an SKS.
I should have added that M1 Carbine to the list of appropriate long guns for a petite seasoned citizen. Or for that matter and AR type carbine.
I'm pretty good at hitting tennis balls floating down the river with iron sights with the AR. Maybe 30 yards or more.