Has anyone played with this combo and 180 grain tipped tsx? On the burn rate chart it is right under imr 4831. I've started working up a load from 68 grains ( that's where imr 4831 begins) and now have gone to 77 grains with no signs of pressure. Next week I will shoot the next batch and get some fps readings. And I am well aware of the different blends for different cartridges and the superformance powder for the reloader is not for the 300 win mag. So my question is am I the only one to try this or is there some type of data out there that I just have not found? If any of you have tried this how did it work out for you.