If you plan on using them for your 209x45 they might actually do just fine. I think the reason the faster they go the worse the results is that, because they are swaged then plated the lead is super soft. I think at higher speeds the rifling might not be gripping very well. But in a plastic sabot cup you shouldnt have to worry about this and they might make dandy practice/plinking loads. I would stick with the Hornadys for general hunting because the Berrys Hollow points, at least in my opinion, might be too soft for good game preformance.
Good luck,
Brian M.