No offense, but you can't claim to have no weight to lose and to have 6% body fat, not to knock soccer, but I'm a collegiate wrestler (and bull-rider for what it's worth), and have a strong passion for running-hurdles/steeplechase and distance, when you get down under 1%, give me a call.

I'm going to back my previous post, a heavy rifle that's easily managed and balances well will suit you MUCH better than a lighter rifle that doesn't handle well...and featherweights don't truly cut enough weight to warrant any improvement IMHO. Compact rifles in .308 are awesome, or a Marlin 1895 Guide gun .45-70, the fact that they're shorter and well balanced makes them leaps and bounds ahead in my book, I've got a 9.2# Marlin that I take on long distance hunts because it's easier to carry than a 6.9# NEF/H&R single shot...if you're in such great shape, a pound or two won't make the difference at all, it's the hassle of the long rifle that wears you out.