Was thinking of building a 6.5-300 Dakota for whitetail deer hunting out to 600 yds max. I would be using an action off of a Remington 7 ulta mag. Probably will be shooting a 120-140 grain bullet. I was hoping to get by without fireforming but don't fully understand all the advantages of it besides more case capacity. I'm looking for any input anybody might have on doing a 6.5-300 Dakota and if there is any reloading data on it. I guess it would be similiar to Kirby's 6.5 AX. New to most of this but trying to learn.