This is the same condition as the 5.56x45mm versus .223 Rem. The NATO rounds (5.56x45 and 7.62x51mm) are a little higher pressured. Anything rated for 5.56 or 7.62 can shoot the .223 and .308 counterparts, but not vice versa.
The Houston Gun Collector's Association is having the big bi-annual gun show at the Reliant Center this weekend. Can't wait, I seem to have an itch for a new shorty, not sure what yet though. <thumbsup>
I've done a lot of biking in the past. But my Gary Fisher has been hanging in my garage collecting dust for a good five years now. I've got the Joshua 0 full-suspension ike.
Another thing I just remembered that I had been told before, is a dry set of clothes. You can take a t-shirt, socks and underwear and shrink them up with a food vacuum packer/shrink wrapper and keep it in your vehicle. This is especially important in colder climates - wet clothes can be your enemy in the elements.