Roseaukaine
I am shooting 100 grains of loose 260/300 grain bullets in Nosler or MMP HPH-24 sabots - from a 26" barrel - I really believe I am getting total ignition of all the powder - using a hotter primer would insure total ignition. Shooting across a chrono seems to indicate things are working... Changing to the cooler Kleenbores might show an end result of less velocity form the barrel especially in a 24" barrel.
Just thinking out loud...