Never owned a .223 contender but virtually all my friends have em and love em.. I learned from my .222 not to get too "hot" this bbl prefers mid-range and below loadings to give best accuracy... then my .221 F.B. bbl acted just abt the opposite, preferring hotter loads. If I make another move it will be to a .17, but definitely not a rimfire.... $0.02... BTW that 22-30 Oresky (the round I sent ya) is still my all time favorite I use it most, and like it best, it can be anything from a .22 short to almost .221 F.B. (it's the same case capacity as the .218 Bee) ..Luckily you have a couple of desireable bbls to trade, if you keep one, I would make it the 357 Herrett (my all time favorite) The one thing I would keep in perspective is barrel length... like I prefer 10" and the .223 prefers 14" ... some rounds were developed expressly for shorter barrel length's, something to think on..... Marty