SPAS is for breaching/intimidation/GSG .22 for room clearing, maybe four full mags.
Just a side note here, I have a little constructive criticism about breaching and room clearing.
I would avoid any situations that put me having to do room clearing or breaching. There is way too much danger in trying to clear a room especially alone and even worse if you have to breach a door first. I enjoy kicking doors as much as the other guy, but without a cohesive fire team you're asking for trouble and even then your risking it without an IOTV and frags. If you need to clear your bug-out location or home after being away during SHTF, you would be better off taking up a concealed position, gathering intel, then develop a plan of action from there. Taking out an unfriendly force from a distance while they are outside gives you much better survivability.
Using the GSG .22lr also kills your chances of shooting through barriers (walls, doors, furniture) that might be required to clear a room. You want precise, quick kills and do not want to get in a firefight because someone was on the other side of some furniture that you couldn't shoot through.