The Hornady Lock-N-Load Overall Length Gages, e.g.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=570611

use a special cartridge case to measure length. The special means the primer pocket is drilled out and threaded to 5/16 - 36. This is a special thread pitch. Anyone know where to get non-standard taps? They charge $6 for the threaded cases, and I was wondering if I could make my own - just need the special tap.

:mad: :mad:

Have you checked Brownells?

GMD...

You can get them here..

http://www1.mscdirect.com/CGI/NNSRIT?PARTPG=NNSRAR2&PMPXNO=1735758

Think think they are around 17.00 or so for the tap.

For drill bit information use this...

"Proper size is .282-.286 diameter. Best fit is 9/32 at .2812 or "K" at .2811 or 7.2mm at .2835.
I=.2720 not a problem in a soft metal."

I have had mine for years and made quite a few cases for myself and fellow shooters.

Hope this helps...

Bill

Wow, thanx. I'd looked in McMaster Carr, and they skip right over this thread pitch.
Cost about $10 more, too.

:)