I saw one too but I don't remember where. It was on a YouTube video for a series that takes place here in TX. I did not see that one coming, a dasher in 6.5 cal.
Nick's a good shooter, he'd do great with any caliber. Haven't chatted with him about it but suspect that the 6.5 Dasher is just for fun and to try something different.
I bet recoil is pretty chill for a 6.5 and you have all the time in the world to watch the bullet to get there... nice and slow.