i must admit that i am having some of the same struggles. i currently have an edge, running a 30" ABS carbon barrel on a Phoenix action with a seekins DBM.
accuracy is amazing at distance. But, i am in the same boat with putting a bullet deep into powder capacity and when the bergers or heavy hornadys come out, it would be nice to run a shorter fatter case with a repeater. i believe the AX or improved Lapua is the way to go. i don't know how long it would take to spin on and chamber an AX from kirby and how much he charges to form brass either. does anyone know if the AX is any more finicky than the Edge? thank you for any info
I don't know that the 338AX is finicky. Haven't heard that it is. A search here will reveal some pretty good extended range shooting with minimal load development by Kirby. Kirby is typically using 100-102g Retumbo, if I recall correctly, with the 300SMK and getting anywhere from mid to upper 2900's to 3050+ fps with 30" barrels and good brass life. Might call Phoenix re your action and using the Lap brass. I believe he reccomended their .750 bolt for the 338 Lapua chamberings if I went with their action.