i used to have that exact can-it's actually 8 lbs. i had 452AA and still have a lb or so left-great for steel gun or other light loads. use it in my 3gun pistol and i figure that lot is from the 90's.
many years back saw a guy do the best flip and catch ever, but he forgot one minor detail. in his haste, failed to remove the mag. dunno where that round went.
i live a 3 wood from the pacific ocean. every machine screw on my 650 has been replaced with marine grade SS. a little corrosion X on other steel parts and no problem.