Thread: Headspace

Originally Posted by Grubby

Checked with a hornady headspace guage and bullet comparator. Maybe someone on the forum with a tikka .270 could tell me what their head space is? I'm measuring using nosler 140g bt , nosler 150gn partition and hornady 145g eld-x. And yes definitely mm. .12 of an inch= 3.048mm

That is measuring from the leed to face of the bolt, which is not headspace. Headspace is measured with gauges that measure from a point specified on the shoulder of the chamber (that point varies with different cartridges) to the bolt face. A rifle with 3mm excess headspace would not fire unless the cartridge was held by the extractor, and if it did fire the case would rupture with 'interesting' results!