Hello guys!

My question is exactly as the topic’s title, what is the case capacity of 7.65x17 mmSR Browning (.32 ACP)? I tried calculating (rough method) myself as follows: half the bullet diameter squared * pi * case length. Converting it to cubic centimeters, I got 0.8566 cm3 (13.22 gr).

Also, I’ve done it secondly by subtracting 0.3 mm from 17.3 (case length), this being the length from base of the cartridge to the beginning of the case. I got then 0.8417 cm3 (13 gr).

I even tried applying the volume formula of the truncated cone using some values from CIP and SAAMI. I got 0.91 cm3 (14.04 gr). Strange as my values tend to raise compared to the ones contained on this page which are halved - https://www.thehighroad.org/index.php?threads/why-is-it-so-hard-to-find-a-list-of-case-capacities-online.582478/.

So, where am I wrong and what’s the exact value? Would you find them in the CIP or SAAMI data sheets? (I have not…)

And I also ask you guys, the Wikipedia values of case capacities of cartridges how are calculated? Are them good enough?

Thanks for the answers!

Bogdan