I load 23 grains of 296 with 240gr,XTPs using standard WLP primers as recommended by my Hornady load book. I have no problems using them all year around and have taken several nice whitetaik in some cold weather without any problems. While I have not chronographed them they do a great job on deer and are very accurate also out of my Super Redhawk. Can't see any reason for me to go to magnum primers.