303 British Load Data

228 published 303 British reloading recipes across 59 powders and 13 bullet manufacturers, with bullet weights from 57 to 220 grains and recorded velocities between 1,984 and 3,865 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
228
Powders
59
Bullet makers
13
Bullet weights
57–220 gr

Sample 303 British loads

The first 5 of 228 recipes.

BulletPowderChargeVelocityCOALPrimer
Speer Plinker 100grIMR IMR-419838.0 gr3,140 fps——
Lapua FMJ 123grVihtavuori N12033.6–36.6 gr2687.0–2864 fps2.886Large Rifle
Lapua FMJ 123grVihtavuori N13036.9–40.0 gr2756.0–2936 fps2.886Large Rifle
Lapua FMJ 123grVihtavuori N13339.8–42.6 gr2815.0–2999 fps2.886Large Rifle
Speer SP 123grAlliant Reloder 10X42.5 gr2964 fps2.910Fed. 210

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