Doesn't the 7.62x54R headspace on the rim?

saands · January 25, 2002, 12:21 AM

I guess I just thought that ALL rimmed cartridges headspaced on the rims. Looking at the Lee Reloading Manual tonight, I saw that they referenced a dimension to the midsection of the shoulder as the headspace dimension.

What gives?
Saands

Archie · January 25, 2002, 01:26 AM

The rim on rimmed cases and the belt on belted cases is the nominal index point for headspace.

However, in both cases, one must insure the shoulder fits the chamber to avoid overstreaching the case. Setting back the shoulder will wear out the shoulder area quickly, if nothing else. Having the case fit loose can't help accuracy, either.

January 25, 2002, 12:21 AM	#1
saands Senior Member Join Date: November 14, 1999 Posts: 1,573	Doesn't the 7.62x54R headspace on the rim? I guess I just thought that ALL rimmed cartridges headspaced on the rims. Looking at the Lee Reloading Manual tonight, I saw that they referenced a dimension to the midsection of the shoulder as the headspace dimension. What gives? Saands

January 25, 2002, 01:26 AM	#2
Archie Senior Member Join Date: May 26, 2000 Location: Hastings, Nebrasksa - the Hear Posts: 2,209	Yes and no. As usual. The rim on rimmed cases and the belt on belted cases is the nominal index point for headspace. However, in both cases, one must insure the shoulder fits the chamber to avoid overstreaching the case. Setting back the shoulder will wear out the shoulder area quickly, if nothing else. Having the case fit loose can't help accuracy, either. __________________ There ain't no free lunch, except Jesus. Archie Check out updated journal at http://oldmanmontgomery.wordpress.com/