Just go old school and bayonet the poop out of the sorry sap who tries to break in. That way you waste not even 1 penny on useless human life (The criminal trying to murder you of course) with a non expendable bullet. HAHA.
I have my SKS and I love it. I may actually modify mine a little with some toys one of these days. I have an original Soviet stamped commie gun. Its a little nail driver out to 100yds. I was thinking of putting a less expensive red dot sight and having a gun smith work on it a little to make her more accurate. I might even consider getting a spiffy composite stock for it. I hate folding stocks though so no go on that thing.
And I have seen frangible ammunition for these which make them VERY much a HD weapon especially in urban environments. The frangible stuff shouldn't make it too far once it hits something more solid than sheetrock.