In a lgs the other day and saw a rifle with .220 Apollo stamped. Looked like a Ruger m77 action. Curios if anyone is familiar with it. My Google search didn't turn up anything.

I recall something similar to that name developed by Ken Howell...

Joe Darbyshire had one and I think CCCC also had one....

something close to a Swift sized case, with a fast twist, shooting 75 grain A Max....

Going from memory only, and it would be time consuming to look it up, but I think there was a complete line of Apollo proprietary or wildcat cartridges many years ago. I seem to recall something along these lines in an old GUN DIGEST or maybe HANDLOADER'S DIGEST. A photo was included. I don't recall Ken Howell's name used in conjunction with this cartridge line, but he may have had some involvement.

There is a seller on Ebay who has some 358 Apollo RCBS dies for sale. According to the box, the cartridge is some version of 300 Win Mag opened to .358 cal. I'd like to learn more about this line of cartridges.

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.