Another large cal state whitetail hunter (35 cal min) here. I would be using a 6 arc if I could, but I can’t. I think from looking at the data, the 22 arc is about the best AR based cartridge, with the 6 arc, and then the grendle. All the same case, just smaller calibers, so velocity is higher. Imho the case doesn’t have enough capacity for the 6.5. Makes you run the lower grain weights and thus lower bc to get any velocity.
The 6 arc was designed to equal the 308 with the 103/105’s and the numbers suggest that the 22 outruns it by a little. I like the idea of the 6 as I can use it in Colorado for elk as well.
350L are super common around here and two of the guys I hunt with use them. Both have had kills out to 200 yards and take a deer or two every year with them.