Ron,
I also like the 250 XTP's, I shoot them in assorted brass, but prefer starline, CCI 300 primers, and 11.2 grains of AA#5.......I'm guessing 1300 or so FPS outta my 16"Winchester scoped trapper. I am getting about 2" groups at 50 yds, and around 4" or a tad more at 100 yds. This load has accounted for 2 Deer and 1 Turkey so far.
I also use the same load with 255 gr SWC in my ruger Vaquerro and my Smith..