Thread: 303 Cordite regulation load modern powder data

Greetings Once More,
Any data, let alone pressure tested data is rare for the 215 grain .303 projectile but I did turn up some for the 220 grain in the 30-40 Krag. 43 grains of IMR4350 gave 2,205 fps in a 25.5 inch barrel with a pressure of 38,700 CUP. This is old data from the 1970's. The two cartridges are very alike with similar capacity. I offer it for what it is worth. Also some .303 rifles shoot the .308 dia projectiles well if any 220 grains can be found for a test. I tried 150 grain .308 projectiles in my two groove and they shot OK.
GPM.

Originally Posted by grandpamac

Greetings Once More,
Any data, let alone pressure tested data is rare for the 215 grain .303 projectile but I did turn up some for the 220 grain in the 30-40 Krag. 43 grains of IMR4350 gave 2,205 fps in a 25.5 inch barrel with a pressure of 38,700 CUP. This is old data from the 1970's. The two cartridges are very alike with similar capacity. I offer it for what it is worth. Also some .303 rifles shoot the .308 dia projectiles well if any 220 grains can be found for a test. I tried 150 grain .308 projectiles in my two groove and they shot OK.
GPM.

Yes i treat the 303 and 30-40 krag as one and the same

Trouble is i couldn't get heavy RN bullets when i built the 1885 30-40 earlier this year

Seems there are RN 174s in both calibers in stick now