Put the name Weatherby on anything and the price goes up. $35 to $40 is cheap. Wholesale Sports wants $31.99 per 20 for just the brass and $46.99 per 20 for Hornady ammo.
Federal loads one bullet weight in 7mm Weatherby. Remington has their own 7mm they want you to buy, so they don't load it.
Reloading is the way to go.
