JohnTRourke knows what he is talking about. Both posts are spot on.

$0.50 is enough to send someone out the door to find it cheaper. Time and gas are seldom figured into the buying motivation. Mil-surp is a "nice to have" item not a "need to have".

I can think of three Army surplus shops along the front range. Two have moved to more current outdoor gear. One is still mil-surp but I don't know how well they are doing.

Is this going to be a B&M store as well as internet sales? Expect people to waste your time trying to get info so they can run to the web and buy it cheaper.

Have you considered overhead? Sales tax. Payroll. Payroll tax. Lease. CAM fees. Insurance. Shelving. Displays. Signage. Advertising. Get the picture?

With the recent ammo shortages, reloading has become popular. Once fired brass might be an option for local sales.

Best of luck.