http://forums.outdoorsdirectory.com/showthread.php/77973-Reloading-Obsolete-Cartridges

https://www.loaddata.com/Cartridge/350-Griffin-Howe-Magnum-350-GH-Magnum/7893

http://forums.outdoorsdirectory.com/showthread.php/4445-350-Griffin-amp-Howe

Since the 350 is the 300 H&H necked up to a 35 cal bullet, or a 375 H&H necked down to 35 caliber,
it should be safe to use reloading data for the 300 H&H with
the same bullet weight, you will get a bit less velocity and a faster pressure drop.

Short mention in Sharpe's "Complete Guide" page 394
using 15 1/2 powder

Mike


Last edited by skeettx; 12/03/17 11:55 PM.

USAF RET 1971-95 [Linked Image from jpgbox.com]