I have ARs in the following cal.: .22 rimfire, 17 HMR, 20 TAC, 223 heavy barrel w/1 in 8 twist, 223A.I., 6.5 Grendel, and in AR10s, a 6x47 Lapua and 260 Rem. If you had these and wanted maybe one more to fit in, what would your cal. thoughts be and why? Just real curious as I don't think you can have too many ARs !