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06-03-2014 | 04:52 AM

#15

SrTelemaster150

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From: Brasher Falls, NY

Quote:

Originally Posted by earlwb

I think it is the extractor groove on the cartridge cases that cause the problem. Many cases would work but the extractor groove is just around that .411 size so that there wouldn't be much if any brass left to thread it with.

In post #8 I listed the actual measured extractor groove diameter of GI 30-06 brass as .406. I just measured some more cases.

Federal 7mm-08 case = .406", Speer .243 Win = .406", R-P .280 Rem = .401", Hornady .243 Win = .394".

All definitely less than the 11mm target.

While a .375 H&H based belted magnum case has a head diameter of .532", the actual case base ahead if the belt is only .514". The 375 RCM is a full .532, the RUM & WSM cases are .551" & .555" respectively.

The short WSM case would be the easiest to come by, the longer RUM are a bit rarer. Your 12ga brass case is interesting as it would have an OD of about .800". Where would you find a single 12 ga brass hull?

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