I'm also starting out, On top of the two pistols, rifle and shotgun, I had to buy;
Leather gun belt (a tool belt would have worked) about $40, a tool belt would have been $10
two pistol holsters - $100 for two medium priced, mass produced ones.
Shotshell slide that attaches to belt - $25 or so
Hat - Got one at Sierra Trade Post for $40 shipped, it was on sale, but even then wasn't as expensive as some other fancy ones. Seems silly to require a period hat, but part of the game is "dress up".
Boots - $100 from Sheplers - Ropers in black so I could actually wear them UNDER jeans and they look just like black shoes if you don't look close.
Shirt - I found a white dress shirt my wife got from work, it says "WebEx" in bright green/blue over the left pocket, which I'll remove and use that shirt because that's good enough.
Pants - Levis jeans, I'm not cutting off any loops from pants I wear everyday, but I did find that Walmart sells $10 jeans labelled "rough rider". $10, sure, I'll cut the loops off those!
Underwea, socks - LOL, I wonder what cowboy underwear was! But for socks, I think you need long socks for boots, I dunno, I've never worn cowboy/roper boots before, to be honest and only got them for this game. The only other boots I have that have no "lugged" sole are motorcycle boots, but they have plastic shin guards on them, which I'm guessing cowboys did not have!
So ... yeah, not "equipment" per se, more like "stage props" that you still need to get into the sport, though I'm guessing that with hat and boots, other shooters won't be too picky if you don't wear them, but if you are going to play, you might as well get into the spirit of the game!
For reloading, I would HIGHLY suggest a Lee CLASSIC turret press. I've been reloading for 15 years, I have a rock chucker single stage and a dillon 550b progressive (I shoot USPSA). If I were starting out again, I'd maybe go for the LCT press because it's well made and not as tedious as a single stage, but less setup than a progressive. I will, of course, use my progressive, but like I said, I've been reloading for 15 years so it doesn't intimidate me. Adding calibers to a progressive is more expensive.
If you get the Lee kit, it will come with most things you need, except maybe dies.