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Bart B. · April 2, 2014, 11:17 AM

jw, one can use most anything to do this. That nylon spacer I used has an inner diameter that'll fit over lots of case neck sizes onto the case shoulder somewhere. It doesn't matter if the shoulder diameter it contacts at is the reference for SAAMI measurements. It's only the difference between fired and resized case headspace that matters when the die's set in the press.

The numbers read off the caliper are only relative to the spacer's dimensions. It just so happens that the .30-06 case shoulder's SAAMI datum/reference diameter is 3/8ths inch. So that same spacer could be used on any cartridge using the same body and shoulder diameters as the .30-06; .270 Win, .25-06 and even the .35 Whelen

April 2, 2014, 11:17 AM	#38
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	jw, one can use most anything to do this. That nylon spacer I used has an inner diameter that'll fit over lots of case neck sizes onto the case shoulder somewhere. It doesn't matter if the shoulder diameter it contacts at is the reference for SAAMI measurements. It's only the difference between fired and resized case headspace that matters when the die's set in the press. The numbers read off the caliper are only relative to the spacer's dimensions. It just so happens that the .30-06 case shoulder's SAAMI datum/reference diameter is 3/8ths inch. So that same spacer could be used on any cartridge using the same body and shoulder diameters as the .30-06; .270 Win, .25-06 and even the .35 Whelen Last edited by Bart B.; April 2, 2014 at 11:30 AM.