I don't think the OP is going to reach 3100 with 140's and current powders. I run a lot of R22 and see 3165 out of a 26" barrel, with 130 ballistic tips. The load is a hair above book, but superbly accurate. For tougher game I'll probably just use Accubonds in the same weight.
I do see there is now data on Alliant's website, like someone else posted, for new Reloader 23 and 26 powders in the .270 WSM. That's interesting, especially if they are more temp resistant.
