Got to admit when I first saw the thread title my first reaction was 45-70. 45-70 with a 45 can (I've used this) is quite; okay not was quite as a 300BO with a can on it but one shot and no running for the gate.
Yup, I have a 12" 6.5 CM that sounds like a mouse fart suppressed. Also one in 300 BO, 357 in 8" as well as a 22 and a few more. TC's are very quite when suppressed.