Plainsman wrote:I use magnum primers when I start dropping powder charges over 60 gr. One of my old Speer manuals recommends magnum primers for spherical powders in cold weather. I have only encountered one sort of hangfire with H414 in a 270 Winchester at a temperature around 0 degrees. In my high volume shooting like with a 223 or 22-250 I like to use spherical because I don't need to trickle every charge. I don't use magnum primers in those smaller cases and have had no problems with spherical down to -20 degrees. I have had no problem with TAC in a 6.5 Grendel or a 308 Winchester. Also no problem with CFE223 in any of my rifles that I use it in including the 200 gr ELD-X in a 308 Winchester.