I've actually had great results with the Prowin in a VFC 416 (390fps). Have it paired with the Maple Leaf 60 Bucking and curved nub along with a 363mm Deep Fire 6.03 TB. No hard numbers on range I'm getting with .28s but I can say I'm getting much farther and straighter hits than I was expecting. I realize people have had mixed results with each of these items but they seem to work great together in my 416!
And Rabbit, I did find that the Prowin chamber seems to taper the bucking lips a little more than other chambers. I specifically encountered the exact same issues you did with the Prometheus buckings. However, with the Maple Leaf it seems it be just the right combination!
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