Re: AR10 cartridge choice help
Boils down to cost of components. Lapua or Hornady brass, the Creed is short enough to take advantage of any bullet, the Lapua is better with 130's and below and runs a little slower (this is with 6.5's) Either one in 6mm has enough powder to run the 105's and such and will shoot just as well. I've seen factory dies for the 6X47 Lapua, not sure if the Creed has caught up yet with the factory offerings but I'm sure they're available.
Same same, Creed has a little more case capacity and cheeper brass (but is still is considered very good quality).
Can't go wrong either way but personally on the 10 platform I'd go with Hornady's version. I don't have one, but I do have both 6mmX47 Lapua and the 6.5X47 Lapua but both of those sit in bolt actions (they shoot very well too).
I plan on building two (maybe three) uppers for my AR10, one is a 6.5 something, most likely the Creed, and one in a lighter weight 18-20" bbl in 338 Federal of 358 Win for hogs and big game in thicker stuff. Of course it seems silly not to have a 308 so maybe I'll have to have that too, but the others will come first as they'll have more use for me.