22 ARC Rifle review Kelby Atlas Lite

Apples and oranges maybe, but my 7mm Backcountry rifle with its 16.5” barrel shot 2920 FPS with the tipped Federal 175’s. I am digging the short barrel suppressed guns a lot.
 
What round count did that fast twist 16” barrel start to stabilize velocity wise with the 88s? And, what is the average MV once stabilized?
 
I built a 22 arc and a 6arc gas gun using 18" rainier barrels and the 22 arc is my favorite by far. Initial testing is great with everything from 55 grain to 80 grain. I'm using lapua 220 russian brass fireformed and so far it hammers. I can't wait to build a bolt gun and really stretch it out.
Curious why you prefer the 22ARC vs the 6ARC? Specific to the rifle(s), the use case(s), or the rounds themselves?
 
Update on the rifle:

6 deer were killed with this set up. From head shots to heart shots, the bullet kills FAST.

Everyone that shot it was blown away by how quiet, and little recoil there is. They all want one as their primary hunting rifle.

What would I do different? I'd go carbon fiber barrel to save some ounces. It's only used for hunting, so not worried about round count.
 
I can't tell from mobile - is that barrel matte blued and then the fluting is cerakoted? Or is the barrel cerakoted black and the grooves OD? Their website only shows options for whole barrel or flutes only.
 
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