For cheap rounds, I shoot cast wheel weight 25 caliber HP bullets in my 256 Win. It's a little more power than what you're talking about. It's a GC mold, but it can be shot either way. It's quite accurate with GC's and 2400 powder.
I picked up those GC's probably in the 70's and have no idea what they cost. I picked up a 7 gallon bucket of wheel weights in Kayenta, Arizona at a gas station - free - it had almost no zinc wheel weights. A local plumber has given me the lead he has been removing for free also - it is a mixture of solder and pretty much pure lead.
With the trend to using the lightest possible cartridge for the largest possible game, who knows, maybe I have a grizzly bear load.
