From a shop in Long Beach California from the 1970s (& before?). The 220 Apollo was meant to compete with the 220 Weatherby rocket, both of them improved versions of the Swift. The other Apollo cartridges from 7mm up are long necked versions of the 300 Win mag and very similar to the Mashburn Super series. Ken Howell did have a design for a fast twist 22 but not the same as the Apollo. In a fast twist barrel it would be an interesting cartridge, in a slower twist barrel it would not gain enough over the Swift to be worth the reduced barrel life that would go with it. Just my opinion but bigger than the Swift for light weight bullets passes the point of diminishing returns.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli