Forming the neck.
RCBS 8mm Nambu 3-die reloading set. This is an older set, and the seller included an RCBS #25 shell holder. Nothing special here; lube the case liberally and run it through the RCBS 8mm Nambu sizing die with de-priming pin removed.
[Pic 1].
40 S&W in press.
[pic 2]
38 Special in press.
[Pic 3].
Trimming OAL to ~.862".
[Pic 4]
The various cases neck-formed but not yet trimmed.
[pic 5]
An experiment using a suggestion by a member in another thread (which I can't find now; sorry!), to power trim the cases.
[pic 6].
Finished 40 S&W case converted to 8mm Nambu and ready to reload.
[pic 7]
Notes
- The 375 and 30-30 Winchester cases were the most difficult to form & neck
- The 375 and 30-30 cases need the primer pocket reamed; the rest don't
- Winchester brass is softer than Remington, R-P, and military
- The rifle brass has thicker case walls, thicker base, and large primer
- 38 ACP/38 Super cases could also be expanded to form 8mm Nambu in the same way as the 38 Special. No groove need be cut and the rim need not be trimmed. I did not have any so there are no pics/comments.
- I test fit about 1 in 10 in my Type 14 Nambu; they all fit; bolt closes; extractor engages.
Conclusions
While many cartridges can be used to convert to 8mm Nambu, I found the 40 S&W to be the easiest.
The RCBS 36404 3-die set seems to be the best for forming & reloading.
In a surprise move, the president of our gun club presented me with a bag of 40 S&W once-fired brass last night. What a guy!
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Last edited by sheepherder; 01-17-2014 at 03:53 PM.
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