As others here have said, this certainly points out the NECCESSITY of normal precautions of forming every case before you load it, and chambering FROM THE MAGAZINE every round before you use it, when you will be in an area of dangerous game, even if that is not what you are hunting. As a general practice, for reloads on dangerous game, I like to fire all new brass once so that it is fire formed to the chamber of my gun, then carefully neck size brass for final loading, still chambering every round I carry before I carry.
I like the 416 Ruger, but I guess there is no commitment from Ruger or Hornady for the cartridge. It would appear what we are witnessing is Ruger dumping its remaining stock of rifles, and the recent flurry of Hornady brass may have been them dumping their remaining brass, even factory seconds apparently. I am just guessing of course. I got a couple hundred more Hornady factory brass last month, so I have enough headstamped brass, but I bought a 1000 once fired ADG brass in 300 PRC to neck up and use for 416 Ruger practice. ADG brass is heavy walled which is good for longevity, but means mandatory careful neck turning when necking up a cartridge with a shoulder. That seems it may be the only remaining option for the 416 Ruger fans. That is a shame, I think it is a great cartridge, but there are older, well established, rounds that do the same or better like the Rigby, Rem Mag, and even the Taylor and Hoffman wildcats. Ruger and Hornady should have known it would be a marathon not a sprint to supplant these with the Ruger offering. That would have meant at least a 25 year commitment to supplying factory brass, factory ammo and factory rifles as a minimum. Guess they were short sighted.