Well, if you can't convince yourself that it would be like winning the lottery in reverse, convince yourself that buckshot won't penetrate a large propane tank WITHOUT having to go through walls first, and you'd be shooting through walls first.
It's a non-issue.
Shooting the stove or lines in your house would be much worse and there's nothing you can do about that. No bullet that would suffice for SD would NOT penetrate stoves and gas lines.
I feel like your putting the cart before the horse. Worry about stopping the deadly threat first, any 1:1,000,000 scary things AFTER can be worried about IF they happen.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.