SBR for  home defense and CQB:  A 10" 1X9 twist barrel like I have will not achieve much in the way of ballistic velocity.  64 gr. Winchester PP would seem to maybe be the way to go.  Would not a 55 grain [e.g., higher velocity] be better to ensure expansion.  Saw some Remington .223 55 grain pointed soft pt at Walmart.  Would it be worth it to get some for 'just in case'? I would not want to depend upon 40 grain Varmint stuff.  266