My idea of concealed carry; If I can’t stop ‘em with the M1911 slung under the left arm, there is always the Taurus 357 mag inside the right front waistband. Just in case I lose those two, there is that Texas derringer in 45LC or .410 in the left ankle holster. I’ll reserve the North American arms Mini in 22LR in the left front pocket as a last resort.
Let’s see... 7+1 for the 1911, 6 for the Taurus, 2 in the derringer, five in the NAA. My, you’re going to be busy changing weapons there to use all 21 rounds.
Me, I’ll take my paired XD45s with 13 round mags and already have more .45 ammo available to me than you have total.