Shane;
I think it might be a tough business to be in, sorry to say. I worked part time for a couple of years at a Sportsman's Warehouse, in the hunting department. It was a new store, and in setting it up, the amount of inventory was staggering...rifles/shotguns coming in like stacked cordword, by the dozens and dozens ( hundreds!). Handguns by the pallet-load. Ammo,gun cases, supplies by the semi-truck load. I simply cannot see how a small shop can compete against such a store, or a Wallmart, Big 5, Joe's, Gander Mt., Cabella's, Bi-Mart., etc., etc.
BUT, having said that, there is a small gun shop near where I live ( close to the SWH, Big 5, Wally, and a soon-to-be Joes) that has been in business for a LONG time. Not a lot of new inventory, but he does deal in used guns, something that most of the big stores do not do. He advertises in local papers about buying used guns, and he goes to estate auctions to buy weapons. With the aging and passing on of the "Greatest Generation" there are many folks desiring to sell guns ( tougher laws also provide motive ). So that may be a way to go. I think his shop is no more then 1000 Sq.Feet. I do not hang out there, but I have been in there several times when older folks come in with numerous guns they want/need to sell..just a few good deals a month would keep you going.
I agree with other posters about not doing custom reloading...simply too much liability!! The first customer who shoots one of your rounds through a weapon with an obstructed barrel, though entirely not your fault, will break you in lawyer fee's!! There are enough commercial ( high volume, big $$) reloaders to fill that niche, maybe just stock their ammo.
Also, I think alot depends on your location..competition..population..etc. I think a nearby military base would be a very big plus, lots of guys in the right age group, disposible income, then being transferred and needing to sell.
Good luck on it!!
Mark