Re: Action length for a 6mm AI
I recently installed a Wyatts' extended mag box on a short action Remington chambered in 6mm AI. The owner provided me with 4 uncharged rounds with 87g. V-Max to his OAL. Extended mag box is full! Not another .010" to spare. So that's not the 'cure' for the short action unless you don't plan on shooting anything heavier. Long action mag box may need to be 'blocked' so the loaded rounds maintain position for proper feeding.
"Shoots real good!": definition; it didn't blow-up in my face.