That's smack dab in the middle of "7-KAM" dimensions. Only it's longer, might as well just neck down the 300-PRC Brass, it would be way easier. These Case capacities are already available in more popular Cartridges starting from the 7-300 Win Mag, and working our way down to 7x61 with all the short mags in between. It's only when we get down to the "7-6.5 PRC" (7mm-07) we regain our Sanity. "7-300 RCM-MX" / Then we are back to 7-SAUM vs 7-WSM in the short Action.
("Kamikazi" whacks brass off at Base of Neck using: 300 PRC or 6.5X68s or 8x68 Brass. Philosophy is not have a large build up of brass from moving Base of Neck Down. Now pondering the same in 300-RUM brass called "SMX") Just Whack It Off!! Suddenly the 300 Blaser and 7mm Blaser Dimensions pop up as the 300 is Whacked off at the base of the Neck and the 7 is Whacked off at the Shoulder.