Wrangled my son out of one of his Sig 556s. No money changed hads but he now owns half of vehicle. One more something like a 556 and its all his. Has an Eotech halosight which works well out to maybe 150 yds. Shoots great groups @ 100 and so-so @ 200. Not comfortable attempting a yote shot beyond ~150... Shoots best, so far, with H-335 and Sierra 69 gr MKs. Plunking along @ 2800 out of the 16.5 peckerwood barrel. I have quite a few Berger 75s, if they shoot as much better than the 69 and 63 grain offerings shot over the 55 gr pills it may be worth a go. My meager search ability hasn't come up with a starting load. Any one out there have any hints? BTW, a weaver 4.5 - 14 Tactical is going on it. Macular degeneration doesn't cut it with the Eotech type sites.