Winchester redesigned the T-Series bullet a few years ago (likely under marketing pressure from the Federal HST). The link you posted had been on Winchester's site for years while the one I posted was put up more recently (I can no longer find the link you posted through Winchester's site). I suspect that the data in your link is for the "old" T-Series while that in mine is for the "new" T-Series (notice that the bonded bullet data is much closer). "New" and "old" Rangers can be differentiated by the boxflap: "old" with say "SXT" while "new" will say "T-Series".
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar