8mm Nambu Cartridge Conversion

[sheepherder]

Got a couple parcels in the mail today...One included a note from Wolff that Nambu recoil springs were on 3 - 6 week backorder...

The other was a 'warranty replacement' expander/decapping pin unit from RCBS...

I've shown the old expander in the pic below along with the replacement that RCBS sent...

The actual specs as shown by my digital electronic vernier is -

Old RCBS - .321"
New RCBS - .3195"
Homemade - .319"

This seems to be a replacement for the 'new' 8mm Nambu die set rather than the older one I have - There's no provision for belling the case mouth with the decapping/expanding unit, although it looks like it would fit my old dies. It also uses the new 'headed' pins instead of the old straight pins.

My new 3-die set is still on back order.

I'm also up to 6 crunched/trashed case per 50 in the neck forming operation. Splits or cracks. None were the 'softer' Winchester cases.