I agree with safariman. PO wrote that stuff when he had only a few powders to choose from. That effects the results compared to doing the same thing now. I would not hesitate to do a 25-06AI. I have two of them and have never felt like it was dangerous in the slightest to fireform and I have been happy with the round. It's not much faster than a standard 25-06 but there virtually is no trimming and I just wanted one. If you want one and have lots of factory ammo I would go that route without hesitation or stay with standard 25-06. I have no expierence the mashburn version. Plus both my 40* 25-06AI's are tack drivers. Shoot .25MOA so it's hard to not like the guns.
