Have been trying to work up a 180gr load for my fantastic M70 Featherweight 308, I tried most of the loads in my "go to" Nolser manual with so-so results, but then I tried a load off the IMR/Winchester site. I worked up to the max load of 46.5gr of W748 and it shot fantastic (.4" groups), upon posting my results I was informed that I was shooting a 70,000+psi load! Or at leased that is what Quickload said anyway, my rifle showed no clear pressure signs and IMR/Winchester says that load is only 48,500CUP, but on the flip side again 46.5gr of W748 is a bit higher then anyone elses max load which is usually around 44gr. What are your thoughts? Is this load playing with fire, or is IMR/Winchester right in calling this a safe load?