I used 700x, win 209 primer and clay buster wads, 1oz 1/8. 12 gauge AA hulls. Up to 29 below zero, when I shot for the AF. Never had a issue of weak load, just split cases. Maybe 3 out of 25 would split when shooting in 20 below temperatures.

Sorry I am not sure of the grains of powder, load data from IMR powder.