So my 14.5 inch, 1/9 twist ubertactical, SHTF, TEOTWAWKI, Chaos Stopper is almost complete. I have pre-stored 4000 rds of XM193 for her. Now I have read the Oracle but I would like a bit more specific info. Regarding barrel length and twist, what would be the most effective round to utilize for defense? Mk262 perhaps? Are there any data sheets or charts available that would show or tell the max. eff. range of my weapon and different 5.56mm rounds? Thanks for your advice and knowledge gentlemen!