163bc,
Wish I had an easy answer for you, but I don't. My belief is that the 270gr in a TSX should be fine. The 300gr might hit just a bit harder, but I doubt it's enough of a difference to concern yourself with. If I could find some 300s to try, I would just to see, since personally I would always go heavier on buff if I could.
As for solids for follow up, I would ask my PH if possible, and listen to whatever he says. Some guys are still set on a solid for the follow up shot, and others have given up on the solid since the "softs" that are used today are so much better. Most people on this forum will probably agree that with the TSX you don't need a solid for a follow up. However, I've seen some pretty adamant PH's insist that you have solids after the first shot. I'd rather go along with the PH than argue the point.
