Thread: 9.3x62 loading

Using .30-06 cases for forming other cartridges will sometimes lead to bulges, as 30-06 cases typically measure .466 at the base, even though the specs say it should be .472”.
The 9.3x62 should be .476 at the base but I’m told by other 9.3 owners cases actually measure no greater than .468”
I read somewhere that .30-06 brass is made with such a minimum spec to allow for the great variation in chambers around the world over 100+years of manufacturing, so it wouldn’t surprise me if it’s the same for any of the other century old cartridge designs so be quite undersized.

Ken Waters cautions the use of brass that is too far under spec in his pet loads column on the 7.7 Arisaka, regarding the use of .30-06 brass to form the 7.7 Jap.

Off topic a little I know… but back to the 9.3, @Billymavs what does the Bertram brass measure at the base? If you can spare a couple pieces I’d like to try some case forming with it?