Wildcatting is a strange obsession. A little like being a teenager in love. I like the .270 Redding concerpt because there are number of fine short actions out there, good medium burning powders, and the number one reason the millions of .308/7.62 cases waiting for us. It is a better choice then my choice.
Years ago I had dis-respectful thoughts. My Dad gave me his Remington short action 722. Brother wildcatter had already wildcatted a 722 in .257 Roberts into a .257 AI. He wanted Dad's old 722. My first and still my reaction no. But I thought about reaming the chamber out to .308 Winchester. I discarded the idea when I started loading for it. I found that maximum published loads were not a problem in that rifle. So I discarded that idea.
The .270-284 Winchester is another combination. The .284 case gives you 30-06 case capacity in a short action case. At times .284 cases are difficult to obtain. I have a hard time keeping track but I think my brother currently has a 6.5-284 and a .25-284. In the hunting field I see no advantage of the 6.5-284 over a handloaded 6.5 Swede in a modern action
I did a lot of research for my brother on the 6.5-284 on the internet. It must be a great thousand yard round with match bullets. But when I looked at the numbers I felt a .270-284 was a better option. I have thought that many years. But in some other short action. Dad's rifle will not change. It is good as it is.
But I think the 270-284 with it's 30-06 case capacity has some advantages.