Fiocchi and Amscor also have plants in USA. RUAG has a number of brands. Norma of Sweden and Lapua of Finland. SK may be one of Ruag's brands, not sure. What about the UK? No Kynoch, H&H, BAE or Eley?
Fiocchi, in particular, developed their reputation as a foreign brand. Making plants in the US is simply to maximize the commercial success, since we are the primary civilian market in the world.
When you're discussing recreational shooting for fun, ammo is a consumable. The GUN is the primary object.
When I fill the tank up in my cars, I get the cheapest gas I can, so I can drive more for less. I keep a Walmart gift card in my wallet, and reload it- because doing so makes Walmart gas (the cheapest I can find) 3 cents cheaper per gallon. I've done this for years, and my cars run just fine, with occasional basic maintenance. Is Exxon Supreme ethanol-free "better"? I'm sure it is; but it might cost up to a dollar more a gallon, if I can even find a steady supply of it.
And whatever maintenance I've done, I'm still saving money overall, if I figure in the cost differential. That's assuming it wouldn't have happened if I'd only used "the good stuff" the whole time; which is unrealistic. I've got 2 little convertables and a pickup, all with over 100k miles on them, and they keep plugging along. I don't scrimp on oil, filters or tires.
Ammo is gas. Lube is oil. Extractors are like tires, maybe. Keep your machine tuned and maintained, and they will work.