.303 British in a No. 4 MK I Load Data

26 published .303 British in a No. 4 MK I reloading recipes across 7 powders and 2 bullet manufacturers, with bullet weights from 150 to 180 grains and recorded velocities between 2,231 and 2,544 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.

Always begin at the minimum charge weight and work up gradually. Never exceed maximum loads. Verify all data against a current published reloading manual before use. LoadDevelopment.com is not responsible for errors or omissions in this data.
Recipes
26
Powders
7
Bullet makers
2
Bullet weights
150–180 gr

Sample .303 British in a No. 4 MK I loads

The first 5 of 26 recipes.

BulletPowderChargeVelocityCOALPrimer
Speer spitzer 150grIMR IMR-303141.0 gr2,519 fps—CCI 200 standard Large Rifle
Speer spitzer 150grIMR IMR-303140.0 gr2,454 fps—CCI 200 standard Large Rifle
Speer spitzer 150grIMR IMR-406444.0 gr2,544 fps—CCI 200 standard Large Rifle
Speer spitzer 150grIMR IMR-435048.0 gr2,485 fps—CCI 200 standard Large Rifle
Speer spitzer 150grHodgdon Varget42.0 gr2,389 fps—CCI 200 standard Large Rifle

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