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I think the "gentler shove" of the old 404 Jeffrey is obtained at the cost of about 230 fps in muzzle velocity. See BeeMaa above. Presumably the 416 Rm can be loaded down to 2160 fps to get the "gentler shove" of the old Jeffrey. The interesting thing is that initial users of the Jeffrey found 2160 fps with a 400 gr bullet to be adequate in field. So why seek the faster harder recoil of the factory 416s ? Factory Jeffrey loads were later upped to about 2200 fps, in response to what need I don't know, and then recently to 2400 fps. But I think the gentle reputation of the Jeffery is due to its lower pressure, lower muzzle velocity loading. And we all know that velocity depends on a sort of "effective average" pressure in chamber, which is somewhat related to the peak chamber pressure that limits the load. The 2160 fps loading seems to be right in middle of the old English prescription for a dangerous game cartridge.
2160 to 2170 is what my 404 runs at....lovely to shoot....if I need to up it a bit just go to my 416 rigby....