Lifetime titanium benefactor
I have not worked with 4831, but me thinks an 8 grain variance between start and max is quite a bit. Loaddata.com has the Barnes manual #3 and has IMR 4831 for the XFB 96gr to 101gr. The change in velocity is only 2602 - 2737. I guess the old x bullet built pressure much more dramatically. So 98.5gr seems to be well in the safety zone. I don't understand why they go as low as 90 grains. Maybe you can still get good groups at the low end and the velocity variance is not much to lose sleep over.
As long as the bullets comes out of the barrel, I'll give it a try.