.223 Remington in a Cooper Arms Model 21 Load Data

12 published .223 Remington in a Cooper Arms Model 21 reloading recipes across 2 powders and 1 bullet manufacturers, with bullet weights from 50 to 50 grains and recorded velocities between 3,331 and 3,459 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
12
Powders
2
Bullet makers
1
Bullet weights
50–50 gr

Sample .223 Remington in a Cooper Arms Model 21 loads

The first 5 of 12 recipes.

BulletPowderChargeVelocityCOALPrimer
Hornady V-Max 50grHodgdon CFE 22328.5 gr3443 fps——
Hornady V-Max 50grHodgdon CFE 22328.5 gr3402 fps——
Hornady V-Max 50grHodgdon CFE 22328.5 gr3452 fps——
Hornady V-Max 50grHodgdon CFE 22328.5 gr3459 fps——
Hornady V-Max 50grHodgdon CFE 22328.5 gr3414 fps——

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