Well now, my AR-15 Cabinet has 14, 1 in .22 L.R. the rest in .223, got three more .223 AR's in another cabinet, also 2 bolt guns and a Mini 14 in .223, 4 x 7.62 x 39mm, one is a bolt gun I built off of a Savage axis. 4 x .308's, (1 x M1 Garand, 2 x M-14's, 1 x Johnson 1941 and a Savage bolt gun). I have really no idea how many .22's. I won't even go into the # of handguns I have in the same calibre.
Buckchaser, believe me, it is perfectly OK to have more than one rifle in the same calibre.
Scott