RCBS Precision Mic 30 30win

[larry7293]

RCBS does not have a precision mic listed in their catalog for the 30 30win. Does anyone know if one of their other mics will work for the 30 30win? I emailed rcbs but have not gotten an answer from them.
thanks

 

[243winxb]

30-30 or 30WCF-
To measure case head to the .375" datum shoulder area, i took a 357 mag case, flared it. This is to compare fired to sized.
Here i measured a factory round before firing in my old M94. Then the after firing measurement.

Factory ammo 2.740" Fired 2.762" stretching of .022"

This has nothing to do with SAAMI measurements. Only to compare.

There are different gauges to check a rifles chanber head space.

 

[Akula69]

I ended up with the Wilson model to check the cases.

 

[243winxb]

The 30-30 headspaces on the rim if you didnt know.
But for reloading, measuring head to datum and pushing the shoulder back about .003" or a hair more is a good thing.