Ditto on the TSX being a bit much for the 303 Brit.
As for data in the Ruger #1, I'm knocking on the door to 308Win data after working things up and checking case head expansion...I think the reports of using 308 Win data is likely not to far from the truth.
I'm getting superb results with 150gr. Hornady's in mine, and if ya want to blow the hair back on your shooting buddies head, load up some 174gr. Matchkings.
YMMV
