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As far as I can find, the dimensions of the rim and case head of the original .500-450 are a couple of thou smaller than the current .416-.500. Is it a simple matter of running the lubed .426-.500 cases into the f/l .500-450 sizing die, or does both the case head and rim need a thou or two turned off? It looks like it should work without lathe surgery unless the .500-450 chamber happens to be a little tight.... what do you think?

Best regards,

Postman

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I have a Webley & Scott .500-.450 double hammer rifle made in 1899 and the Jamison .416-.500 necked up chamber and headspace just fine. A couple of thou (if any) rim/case head just doesnt make any difference in my rifle.
I run the .416-.500 over a .44 mag .429 expander first then a Lyman M type expander to .458, after that run thru the full length sizer and there you have it. First firing takes care of any leftover shoulder differences.
Could also just run standard .470 or .465 cases thru a full length die. Probably would not even need neck reaming?
- Mike