So waxing shotgun rounds is kind of a non-starter. For 500 yards, I’d be a big fan of a .50 cal. 100 yards, a .30-06.
For anything shorter than that, I would use passive defenses since they are likely using armor, like an MRAP. A backhoe some cheap wood and some time can make an MRAP pretty useless. Of course if you disable their toy, they’ll prolly send in a Reaper and nick you with a Hellfire.
If an MRAP heads up my drive, I’m not staying to discuss the situation.
I’m set up for criminals and animal control, not an insurrection.
I’d love a 50 cal but a .308 is good for 500 yards.