I’m a tad faster than their minimum published twist rate. They specify a mimimim of 8.5 and I’m at 8.0. If 8.5 is both the minimum and the maximum, they might note that for us. My barrels on order are no longer 8’s, but I began with eight, 8 twists, and that makes for a lot of shooting, if it’s not ideal. I don’t do moderation very well, I realize that.
On velocity, I’ve got to be at the lower half of what they anticipated. I shoot them through a 300 Win Mag looking for 7 good reloads at least.
These are monster bullets. I would imagine that Hornady foresaw no smaller a case being selected than its own 300 PRC, which is neck and neck with the Win Mag. The bullet would have been expected to be paired with cases like the RUM and 30-378 Weatherby, if they think anything like I do.
For big 30’s, I have that biggest Weatherby, the much smaller 300 Weatherby Mag, and the Lazzeroni Warbird in a single shot bench rifle. There’s no reason to shoot them through a larger cartridge right now though.