Chris, I replied to your e-mail. I tend to go heavier with my strings than needed. 12-14 would be fine out of that 57# Magnum... I thought it shot fast with the 16 strand. I had a better flemish that came with it, but I frigged that all up, so I put the old B-50 on it. I only use Dacron B-50, as I dislike fast flight. I just don't care about another few feet per second, it doesn't matter to me, and the critters don't seem to notice the difference either.
I read an article by Fred Bear years ago and he mentioned using a string a few strands heavier than needed for extra strength, in case you accidently rubbed it against a tree or rock. It made sense to me, as if there is a way to bump into trees or brush, I find it...LOL!
Enjoy the bow and your X-Mass!