H4831 fills the case perfectly. Seems to be kind to my barrels. 3030 fps. No pressure and more reliable than I am. Lapua case, 105 hybrid, 210M, 25.5” and 26” Criterion barrels, 2.865 COAL. (-.020).
My guess is temp. tolerant as the best of them. 100+ degrees, heat soak, sun exposure, certainly...