Learning as I go. How did you know that the "very tight to chamber" was a length issue, and not a "fat case" issue? I don't think my SAAMI GO or NOGO gauges do the case walls or the case head diameter, just the headspace length - so what you describe can also be from cases "too fat" or not tapered enough. I am assuming that you did Jiffy Marker or soot trick to find out the issue?? SAAMI calls out min and max diameters as well as min and max headspace, so more than one way to be "minimum spec", but two different issues??
You can find out whether it is a "length" issue vs a "diameter" issue by lighting a wax candle, ans smoking the whole case.
Then try to chamber it. If the smoked section that shows evidence of contact is only the shoulder, you have a length issue. If
the case has the carbon removed from the outside of the case, particularly near the base, you have a diameter issue.
As I mentioned in my previous post, [re: my custom 308 Norma Mag] Both issues could be present. Dave.




















































