Perhaps ten years ago, this author began advocating use of relatively mild primers for many applications: lever-action rifle loads, reduced velocity loads using very small charges of pistol or shotgun propellants in any rifle cartridge, and many blackpowder loads. In this context (and generally), by "mild," we mean a primer type that generates relatively less explosive shock (brisance) and relatively more heat (thermal energy) per unit of energy released and which may generally produce less total energy, compared to some other primer type. The RWS 5341 and Remington 2½ are classic examples fitting the description "mild" while the Winchester WLRM and Federal 215 are at the far opposite end of the spectrum and, by any measure, are "hot" primers. By the way, one dares not miss an opportunity to state the following: While Federal's 215 has long held the reputation of "hottest primer available to handloaders," by every ballistic measure one might wish to test, Winchester's WLRM is far "hotter" and always has been. While the latter may generate less pressure and velocity in the occasional load combination, in the majority of instances, it will generate significantly more pressure and velocity. Please refer to the included tables. (Evidently, this longstanding misconception stems from an unfounded rumor, begun by ignorant gun writers, upon discovering that the 215 had been developed specifically for use in factory loads of the largest Weatherby Magnum cartridges and who then assumed that that fact demonstrated that the 215 just naturally had to be the hottest primer available.)