I would want something black powder so I could reload. 1760 America is like saying eastern europe. You would want to have something you could get ammo/powder and ball for from locals if you had to. Springfield black powder gun made with Mass production. Parts could interchange.
Damn thats a hard question. The AK for the fire power. The 870 for the versatility (spelling?), the 10/22 for practicality...... damn hard question. Id have to say the 870 with a decent supply of slugs, 00, and #7 or 8 bird shot. One gun, many uses.
6.5 Grendel with a scope mounted on it. It should be able to give me distance and penetration that I would need. It would also let me carry more rounds than an M1A/M-14 type rifle. I did that in Viet Nam and I can testify that lugging around an M-14 type rifle with ammo is not something easy to do.