It&#x27;d slow down eventually, LEO still has a really thin atmosphere that would still affect a bullet, it&#x27;d be way longer than 2 miles though. Effective range makes more sense for a spacegun and would be more of your ability to accurately point and fire than the distance the round could travel. If you can only accurately hit objects within 2 miles the fact that the rounds would orbit for a while doesn&#x27;t really matter.