RC was on the money.
Any SP 150-grain will be fine. If you were buying dedicated defensive ammunition, I'd probably get hollow points, if you could find them, but really any of the lighter hunting loads will do the job.
If you had time, having both would be excellent. Anyone who protests that a shoulder arm is easy to have taken from you needs better training, honestly. (It's hard for me to think of a way to say that less bluntly, and since it involves people's lives, I'd rather say it than let it pass uncontested.) One important thing to remember about law enforcement, is that they have a duty to (1) enforce the law, and (2) use the minimum amount of force possible. Citizens do not have these duties, so attempting to extrapolate what will work best for the armed citizen from police fatalities is silly.
It's not a "wonder nine", but my home defense combination right now is a lever gun with hollow points and a 9x19mm with 124-grain Gold Dots, too.
The 9mm is my bedstand gun, and the lever can be quickly accessed.
If I have time, I will always get the carbine.
If you can use the lever-action well, there is absolutely no need for a 12 gauge for defense. Some folks would argue that a good lever-action in a hunting caliber is superior to a semi-automatic carbine in a lighter caliber. ( I think either one will work just fine
for most folks, and I haven't troubled myself to get my AR carbine out of storage for HD duties in my current domicile. I actually do think the AR is a slightly better choice in general, but not if the user has a lot more experience with the lever gun.)
I know a bit about house-clearing. I don't know anyone (troop/unit) who does it with a fixed bayonet. (I'm sure there's somebody, but there's just no need for the bayonet.)
The 7.x62x39mm's reputation as a poor stopper resulted from hits by FMJ. The
wound profile from expanding .308 ammunition is considerably different.
One test of 170-grain 30-30 SP had the bullet stop in the 6th water-filled jug. This is (IMO) just slightly deep, but a 150-grain SP or any HP should provide
ideal defensive performance.
I believe a single good hit with the .30 will be
at least as effective as two hits from a 9x19mm. This means a single good hit should stop a human threat, but there are almost always special cases. You might meet someone so coked up on meth that shock does not take over for several minutes, so be prepared to fire again, even with the .30. (This is where having a backup weapon would be appreciated, should you face several drugged-up threats.)
Of course waiting for police assistance will be the preferred tactic, but I understand response time may be slow because of your location. It's good that you're thinking out your responses ahead of time. If you haven't already, it's probably a good idea to try to make your building less accessible to casual intrusion.
Good luck, and practice with whatever you choose.
John