Great post, thanks. It's funny, I learned this as a cub scout back in the day, but forgot.
My SHTF kit is pretty basic, if the wife and I can't carry it, it's not in the kit. I'm in the city, so I have to plan on basic tools and equipment that we can carry. A couple of cans of sterno equals a couple of hundred rds for the 10/22, or 30 rds for the mini. We won't be carrying much in the way of supplies, mostly tools to aquire supplies.
What, me worry?