The case length is the same, the ratio of base diameter, shoulder diameter and bullet diameter between the two cartridges are almost the same. As a long time fan of the 7 BR very set up for loading it for my Lone Eagle pistol, I have dreamed of a 7BR rifle. A 7BR rifle is an expensive custom, and problematic due to feeding and best suited for a more expensive single shot action. Brass availability is another mildly complicating factor.
The Howa mini action rifle in 6.5 Grendel is the cheapest way to get almost what I desire, but would require a custom stock to make it lovely, ditching the moulded stock. Closer would be to purchase a barreled action Howa mini in 6.5 Grendel and make a wood stock, or just an action and open the bolt face to allow 7BR and get a custom barrel. Bottom metal for single shot would have to be made.
The Howa mini action rifle in 6.5 Grendel is the cheapest way to get almost what I desire, but would require a custom stock to make it lovely, ditching the moulded stock. Closer would be to purchase a barreled action Howa mini in 6.5 Grendel and make a wood stock, or just an action and open the bolt face to allow 7BR and get a custom barrel. Bottom metal for single shot would have to be made.