Actually, Cayugad, the Black Diamond open sights are laser bore sighted at the factory for the 240 xpt and two pyrodex pellets. When I bought mine, first shot was dead on at 50 yards with that combo.
Back to the original question, I found that being a little more careful with the lug screws when putting the barrel back on after cleaning will cure the issue of the stock and barrel touching. Still haven't been able to get back out to check different 777 loads.