Don't know about downhill, this is one from Mike and still doing lot testing at 50M. That would put these 5 shots at .126 center to center.
Using my atlas bipod and rear bag on a bench
22" Ace VCC Barrel - Rimx
CenterX
I have Manzella spinning up that VCC barrel for me now that I’ll mate with my incoming rimx action.
Looks like I’ll need to get some eley match lol. Even though I have a few bricks of center x still