Not true. Calibers I own:
380
9mm
40
10mm
357 mag
45 acp
500 mag
5.45x39
223
308
12 GA
I may be forgetting somethin
.22 LR/L/S
.22 mag
.32
9mm
.40
.38
.357 mag
.357 sig
10mm
.45 acp
.45 colt
5.56
.308
7.63x39
7.62x54
.410
20 g
16 g
12 g
I hope that is all... but maybe not..