The worst of it is...if you are truely OCD as i am, & also have a leaning towards neatness & symetry, the gaps are not only more numerous, they're also uneven...!!
I dont know what goes in between a 243 & long action 6.5...
...a short action 6.5...a creedy...
But for the excessive gap from 222 -243...
I suggest 22-250 (only girly men shooters dont have a smack-dinger of a 22 cal
)...
& then for the upper end of that gap... as Pete says, a 257...
The man who knows everything, doesnt really know everything...he's just stopped learning...