rondog

Get a plastic 50 round cartridge case and load up 50 rounds, each five rounds increase the load half a grain. After each 5 shot group label each target with the load info.

Go home and study your targets and then reload the 50 cases with the most promising powder loads and retest.

Remember, when the .303 Britishicon was in use we didn't have the "slower" burning powders we have today. You have a 25 inch barrel, take advantage of the long barrel and slower burning powders which equals lower pressures and higher velocities.

Again please take notice the load data I posted keeps the chamber pressures at or below 43,000 CUP. If you load higher pressures than 43,000 CUP you will be loading the American cases to a higher pressure than what the factory loads them to. (And the cases will not last as long)

Use the rubber o-ring method of fire forming your .303 cases and then neck size only.