Chamber Headspace Gage

[NeiljohnUK]

Looks like a tool many of us could use, in suitable calibres, chamber variation between same model guns means reloads often need to be specific to each, my Mod 94's in 30-30 were like that, and some donated brass (.357 mag) once fired in a 'yellow boy' won't chamber in my '94 of the same calibre until it's been resized, unlike the native fired in it empties. Of course barrels made towards the end of the chambering cutters life will be tighter, my match 7.62/308 is one such gun, done that way by a very experienced Olympic shooting gunsmith, factory loads and full length resized reloads are fine, a few rounds my father made up in once fired cases, from a 'new' cutter chamber new gun wouldn't allow the bolt to cam let alone close!