Re: 7MM STW and 140gr Barnes TTSX bullets
The Barnes website lists their proposed ideal seating depths for the TSX and during the course of my own research. I would agree. I can't rember what the jump is but it was somewhere between 30 and 40 thou which is not a great deal. Accuracy with the TSX is usually very good but as usual, inividual rifles will give varied results. I have used the 140 grain Barnes in the &mmRM and 7mmRUM. Even pitted it against the .375 H&H loaded with conventional 270-300 grain bullets. The Barnes out did the big bullets- no surprises there I suppose.
You will most likely find that the Barnes is a little too stout for lean bodied deer out beyond 250 yards or so- best for tough or rather densly muscled animals.