I've gotten very good accuracy with both the 130 & 140 TSX BT in a Cooper .270. Forget the Barnes book OAL; that's a very general recommendation and not necessarily even a good place to start. You need to seat bullets for your rifle and you don't need any after-market gizmos to do it right, either.

Seat the bullet where it is engraved slightly by the lands. Then, seat the bullet .003" deeper and make up four test rounds using one of the 4350s (I prefer H4350) or H4831 (you can use other powders but these have always worked best for me in about any .270). A moderate charge should be fine until you find the seating depth, then you can experiment with different charge weights. Make up four more rounds with everything identical, but seat the bullets another .003" deeper. Then, do the .003" one more time. One of those depths should provide you with an accurate load.