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I know of two 412s barreled in 375RDS which is more powerful than the H&H version. I have personally rechambered a 375 Win to 375 JDJ and shoot heavy loads through that (300 gr bullets) since the barrels are pretty fast twist, surprisingly so given the original chambering. My guess is the blanks that were available at the time were made for the H&H. I rechambered another, on an engraved action by Ben Shostle, and sold that many years ago.

The RDS is based on the 450 basic case which is pretty fat and that's both good and bad. Good, pressures are lowered in a fatter case; bad, back thrust is heavier, exponentially so. There was a guy in AK who built a number of these RDS wildcats and sold them with a set of dies. He also did some smaller wildcats on the same case.

Both my 375JDJ and one of the RDS rifles had the solder of the vertical regulation wedge fail, probably due to vibration. I had mine micro TIG welded by one of the best tool welders in the Pacific NW, and the owner of the RDS had his redone with the original silver solder which was messy. I don't know what loads that gent used (well I did at one time but I forget) but they were pretty stout. He stated he used 375 Weatherby load data if I recall. I was with him when he shot an elephant, buffalo and lion with that rifle. A few years later he passed and the rifle was acquired by "Stealthmedic", one of the many unlicensed firearms dealers on the usual websites, and found to have an unusual feature: there was a manual extractor slot filed in each breech to allow the ctg to be extracted using a screwdriver. I also note that when the rifle was in Africa, the gent who used it thought you could swap these barrels sets around willy nilly and the barrels were a poor fit on the action ... the action did not close fully, not by a yard. The owner explained this was necessary because the action "flexed" and the cases stuck in the chambers! In reality, he had too much headspace. The person who bought this rifle bought a mess.

Then I acquired a similar set of barrels in 375 RDS, these unmolested. I fitted them to a new 412 action I have (correctly) and got a set of dies from CH4D. I still have that rifle. I feel it's ok with H&H data, esp given the larger case, but I would not push it past that point and see no reason to do so.

Over the years, I attempted to convince the manufacturer of the 512 to offer a heavier caliber but they refused. 9.3x74R was the heaviest caliber they offered.

The entire series ... 412, 512 and the 612 have now been discontinued.

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