Originally Posted By: spotstalkshootHas there been any physical science correlation between primer flash form/temps and powder shape/burn rates?
Some, but it is scattered. Not scientific or comprehensive or consolidated in one place.
We do know that ball powders (most) benefit from a magnum primer. Cold weather conditions, generally benefit from a magnum primer. Some powders like MP-300 need compression and a mag primer to ignite even at all.
We know through application, that benchrest or match primers give more consistent ignition with extruded powder and reasonably temperate climate conditions, like competition matches.
Otherwise, I find it fascinating to take a known to you load that shoots well and is proven, and start switching only primer brand and type. The results are often remarkable.
