Initial velocity work up for KAK 12.5 inch barrel with 62 gr. Hornady fmj-bt and 6 powders

I couldn't find reloading info in terms of velocity expectations and performance for 12.5" bbls, so I decided to start this project to share with the community. This initial work up is using 62 grain Hornady fmj-bt bullets and the following powders: A2230, A2250, IMR4895, IMR8208XBR, Shooter's world Match rifle and Shooter's world AR Plus. I'm hoping to do this initial work up for velocity and then transition over to developing loads for the 62 grain Speer gold dot bullets once we settle on a good training load using the cheaper hornady bullet.