If by great, in reference to rimfire, you mean mediocre, you are totally right. That is why competitions are banging down the door the Remington, Federal, Winchester, and CCI to get their "target" grade ammunition and leaving Eley, Lapua, Wolf and S&K behind.I think American ammo is great, perhaps the best on Earth. This does not mean that some foreign made ammo, particularly from the European Union, is not outstanding quality too.
Because foreign ammo does this:
1. Use only U.S. made, SAAMI approved, new production, brass cased ammunition.
2. DO NOT use imported ammunition of any kind. Read the labels carefully.
3. DO NOT use factory reloaded ammunition.
4. DO NOT use steel case ammunition of any kind.
5. DO NOT use hand loaded ammunition.
6. ONLY USE caliber specific ammunition designed for use in your AR15.