On the reloading thing, I'm pretty sure that's a drama/plot decision, not in any way reflecting reality. My reasoning is that some non-gunner friends who watch the show and I were discussing ammunition, and most did not understand that the average gunner with the right tools, supplies, and a little information can reload ammunition until they run out of supplies. Heck, a couple of them didn't understand that a round for one firearm won't necessarily work in any firearm. Again, I think that's an APS educated view of how we would act versus the way the world watches the show. After all, how many times have we laughed about sitting on a roof with a scoped .22 and a picnic lunch and thinning out the walker herd...
By the way, loved seeing Daryl hand Rick his Python. It's like throwing a switch. Old Rick is back. Time for Negan to die.