8mm Nambu Cartridge Conversion

[Sieger]

Originally Posted by rhuff

I, personally, would not want an expander that was the same size as the bullet diameter. I usually try to achieve .003-.004in. smaller expander over the bullet diameter so as to achieve a good interference fit, and excellent neck tension. YMMV.

Hi,

For bottleneck pistol cases, even when trying to seat FMJ bullets, my experience, with smaller expander buttons, has been consistent buckling of the case necks. This, however, has not been my experience with straight walled cases like the 9mm.

Also, I've experience lead shaving when trying to seat lead bullets with tight necks.

My experience with both has been to size down only enough to allow good entrance of the bullet, with the tight part of the neck being under the bullet, so as to avoid setback upon firing.

Just my experience.


Sieger