Great stuff AWS. Thanks for the fur report on you 6 ARC. I've got the same rifle and love it. I used it in November to take a mature white tail doe. With a clean broadside double lung shot she went down after 60 yards. This was using factory 108 ELDM's and got a clean pass through. I'm really looking forward to using mine on coyotes.
Can you please update us when you get a chance to take one broadside.
35 in/lb is what howa concluded works best for plastic bottom metal. See attached pdf from howa. I'm going to stick with the factory bottom metal i mean plastic until i see signs of failure.