ed308,
I didn't opt for any of the 7mms, but the four I have cover my bases.
5.56 - 10.5" (and a 16")
6.5G - 12"
.300AAC - 10.5"
.450BM - 12"
This of course leaves out the .22LR, .22WMR and 9mm ARs I own. (As well as the Armalite AR-10 in .308 and the AR-15 in 7.62x39 that I let go.)
I had to choose a place to stop and I'm there, but like I've said: Y'all have fun.