Hmm, by hit cap I think you mean "What's the base miss rate?". The base miss rate is 5% at all levels.
Several classes have talents that increase your chance to miss vs them even more, which I think max out at 4% so you could go all the way to 9% Hit chance before you stop missing.
Ofc you can only get to 5% on a Hunter, but the main point is that it's definitely worth it. Here's a BiS set for 49 Hunter.