Because I'm curious... what are your plans, re: projectile selection and muzzle velocity?
I ask because I have been playing with a .223 AI and seeing 2800+ FPS shooting the Sierra 90s with a 26" 7-twist barrel using 2000-MR powder. I am confident that a hand loaded Valk will be able to exceed that, but if your performance goals can be met with 223 AI, there are (IMO) reasons to go that route rather than Valk (mostly in regard to brass availability/quality and the ability to shoot inexpensive, easily-found, off-the-shelf ammo in the form of the parent cartridge).