Correct me if I am wrong. But isn't the 250 Savage and the 300 Savage both proprietary cartridges? I think their demise was due more to the advent of bolt action rifles, and by other manufacturers who wanted to use their own named cartridges. To say that a 30-30 in a Winchester is deadlier than a 300 Savage in a 99 would be wrong. But the 94 Winnie could be bought in 1976 for $70. And there were hundreds of thousands of them out there. I do not believe any cartridges replaced the oldies, just marketing. Isn't the 22-250 popular-and remember where it came from.

Good luck finding the rifle that your father wants. I wish my dad was here so that I could buy him one. Tom.