I have been following this chat. I am in the business of selling an buying stuff. My partner in the firearm business is a ammo dealer. We are finding out that there is a shortage of powder right now, due to military orders. But with PPU making so many different calibers for the older rifles there is no shortage of ammo. Even thru the covid bull. We maintained stock. The Reloaders due have many options to build most calibers they need. Factory ammo if steady on price of the normal stuff. The lesser degree calibers are not so. But with the brand of PPU an a few others all the mil-surp calibers seam to be available. I feel that you should make what caliber you want as its your rifle. If I can help with anything reach out. Mike