I've been running the 55 bergers slower than I want to already, average 3750 fps. I had some loaded up around 3950, but never shot any dogs with them... just the slower ones. I'm so use to seeing them drop on the spot using 40 vmax that I got disappointed with any type of spinners or short run offs. They don't splash...just blow a quarter size hole on the opposite side.
I wish I had shot some dogs ith the hotter rounds to see how they would do.
My friend in Okla is shooting the same setup, but hotter, like 4020... not sure how his is doing, but I'll call him to take notes. I hate to have a hot rod and run it slow.