I absolutely agree that the rimmed round is better suited for applications in a DR, but in this particular caliber I don't know of anyone in the US that loads it. I have seen that Heym currently lists 3oo win. mag. and I've seen beretta and others offering 458. That said, I've heard no shortage of warnings against DRs with rounds (like 416) designed for use in bolt guns and making substantially higher pressures than one would normally associate with ideal DR loads.