There were various reasons that the H&H and 35W wouldn't work as an RSI..from the action length to the end cap dimensions.....As cartridges for RSI's I just thought they would be neat to own.
Robert
I think you could make an RSI in .35 Whelen. I built one in .338 Federal, and had to relieve the nose cap very little for the slightly larger muzzle diameter. A Whelen barrel would have to be only .020" larger at the muzzle, and I think there's plenty of wood at the muzzle and room to open the nose cap to fit. .300 H&H COAL is too long for the standard Ruger action, I think.
I would love to see Ruger bring out a LA RSI in 9x57 Mauser, or 9.3x57. That would be ultimately cool -- especially if they figured it out and put a 20" barrel on them.
I like my .338 Federal RSI a lot; hope to show some pics this fall with dead things
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Dennis