4th if your considering anouther shed for ammo and stuff, check out some of the sheds they have at Lowes or Home Depot. Some of them are pretty decent. You,,, could,, probibly build one cheaper than what they get for them,,,, but for me it would be the way to go,, just for the convenience of haveing it complete and delivered. I got to many other things going to worry about anouther project at this point and from what I figured it's only about 4-5 hundred more than building it yourself, it would be worth it to me. I liked the 10x16,, I think it was,, with the gambrel roof, all kinds of door and window options avalible too, I'd just want a single door without the shed/tractor type door myself and some double pane windows. Should be more than big enough for a realoading /storage bldg for you I'd think, check them out just for shits if you haven't seen them before. Might just work for ya if your looking.
I like your storage room Black Blade, and putting the safe in a corner is a good call too, harder for someone to pry on the door that way if they did try getting into it. You saw my mess/pile, I've got to build some good 2 by shelves like those too, I got the material on hand, just to much else going on right now to fuss with it at this point. But i do really need to get it set up better, that whole reloading room section of the building is a mess and needs a hoeing out and rearanging at this point. Trying to figure out what to do with all the extra stuff at this point though, time for a yard sale I guess!! Just To Much Junk!!!