ONE HOLE 45/70
I went through this with GB awhile back ( He was right ) and according to Hodgdon , H110 and Win 296 are the same powder and have been for some time now , so the data for H110 will work .
Per Hodgdon's web site the load your looking for is 25.7 to 26.5 grains for the Hornady 250 gr. XTP .
WARNING --- This data is for Ruger and TC's ONLY
stimpy