I do not understand how the primer face being harder started the bullet moving before powder (ignites) however I have to say that Hornady factory 22H ammo shoots extremely accurate for me out of my Savage 40 & I am fairly sure they are using rifle primers.

As far as the weather goes I honestly don't want to work up a few loads and go out into the sub freezing to sub zero weather to test them. Currently I have about 10 rifles (including another new B.Mag) & 3 scoped handguns that need zeroed and it is to cold for me. I am missing out on some prime squirrel hunting because of this.