The .225 Winchester replaced the .220 Swift and PO'd a lot of folks. The Swift had a rep as a barrel burner and Winchester thought they would tone it down a bit and the.225 would be a hit, but the .22-250 came out shortly after and took off leaving the .225 in the dust. The .225 comes up about 100 fps short of the .22-250. My old boss had one and I helped him develop a load for it because ammo was hard to find even back then. The JD Jones line of cartridges based on the .225 have kept the brass in production, although production is limited and you better grab it when you find it. There may not be any more made for a couple of years. As far as I know Winchester is the only source for the brass.