I'm all for the spirit of helping fellow artists. But I think you're offbase if you believe "serious actors interested in improving their craft" are the people you're going to get as volunteers to do your reading.
You're more likely to get people that think this reading will be a stepping stone. That you're going to see how good they are and CAST them in the film (even though you're only the writer). There are also actors who will leap at every possible opportunity to show off, which is akin to sending your script to anyone who shows the slightest interest. The problem with that, of course, is that a lot of people that claim "interest" can't actually do a darn thing for you.
It strikes me odd--and JustinoXV alluded to this--whenever anyone on this board suggests it might be okay to do something "for free", the response is outrageous. "Real writers get paid!" is the response. It's entirely possible that you'll find good actors willing to help you out, but the decent, PROFESSIONAL thing to do is compensate them appropriately. If you believe making the experience as fun and interesting as possible is sufficient compensation, more power to you.
Oh, and one more thing: be honest about your credentials and the status of your career. Your private table reading isn't going to be anyone's big break, and you need to be up front about that.
If you're involved in a network of would-be actors and writers who get together regularly, that's another matter entirely. That sounds like a support system, and it's good that those exist.