Thanks for the input, fg_in_fla. Up until this deer season, I had been using 100 grain Sierra GK's and 4831SC, with excellent results in accuracy and 1 shot kills. While tuning up for this season's opener, I read about a guy who used I 4064 for his heavy bullets, so I played around with that powder combination and discovered that 36.2 grains of it gave me consistent 1/2 inch accuracy at 100 yards. The 4831SC had been providing me with 3/4 inch groups for years. So I switched powders and have collected 2 deer and 3 feral hogs, each with one shot. And, stomp, I find that elevation and temperature have an effect on bullet stabilization. Our county here in Texas has an average elevation of 2200 feet, and when I go down to the Gulf Coast and shoot, I always need to make scope adjustments to keep the same POI as I did up here in the Hill Country.