Author Topic: Miking case heads:Blade or Standard Micrometer (Read 245 times)

goodconcretecolor · « **on:** March 02, 2006, 01:26:21 PM »

I have read in some sources that cases heads should be miked for expansion with a blade micrometer but most sources make no mention, blade or standard leading me to wonder if a standard mike was used. Good standard mikes can be had for abour $50 but he cheapest blade miKe I could find was over $200. What's the scoop.

KN · « **Reply #1 on:** March 02, 2006, 03:52:39 PM »

I don't know why you would need a blade mic. Or a micrometer at all. Just use a good set of callipers. KN

goodconcretecolor · « **Reply #2 on:** March 02, 2006, 04:52:39 PM »

Case heads must be miked to 0.0001". This requires a micrometer. Calipers are typically accurate only to 0.001"

jhalcott · « **Reply #3 on:** March 03, 2006, 11:12:10 AM »

I don't know why you'd need a blade mic. You don't measure in the groove, you measure the pressure ring itself. Which is above the rim/extractor groove.In a belted case the ring is just above the belt,I believe .0001 mike should give a better "feel" than any calipers,and should be cheaper than verier calipers.