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Hello, thedaddycat (would love to here the story on that one!) I made a gage like yours for a .22 Hornet & .222 Rem. I shortened case neck up by about 3/16" No handle on mine..just sharp edged, flat face brass rod..fairly snug fit in case neck..outside of end same dia. as case neck. I have found some of these chambers..even on custom guns are .030" to .050" or more longer that max. trim length in loading books. I think the reamer mfg. do this as a built-in liability safety measure.
Wayne Schwartz did a write up in the Cast Bullet Association's Fouling Shot magazine on this. In his case it was a .30-30..one of the worst offenders. Shooting soft-cast in schuetzen matches, the soft lead was obturating out into this excess space, before being swaged back down in leade..not good for accuracy.
I see alot of posts from new guys sweating over a few thou. difference in their case lengths..when they are probably using cases far too short already!
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