300 REMINGTON ULTRA MAGNUM (RUM) Load Data

32 published 300 REMINGTON ULTRA MAGNUM (RUM) reloading recipes across 9 powders and 6 bullet manufacturers, with bullet weights from 110 to 220 grains and recorded velocities between 1,974 and 3,965 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
32
Powders
9
Bullet makers
6
Bullet weights
110–220 gr

Sample 300 REMINGTON ULTRA MAGNUM (RUM) loads

The first 5 of 32 recipes.

BulletPowderChargeVelocityCOALPrimer
Barnes TSX 110grRamshot RAMSHOT MAGNUM102.7–114.1 gr3585.0–3965 fps3.585Federal 215
Hornady SP 150grAccurate ACCURATE 246040.5–45.0 gr2377.0–2701 fps2.850Federal 215
Hornady SP 150grAccurate ACCURATE 249542.8–47.5 gr2436.0–2768 fps—Federal 215
Hornady SP 150grAccurate ACCURATE 252041.9–46.5 gr2431.0–2763 fps2.850Federal 215
Hornady SP 150grAccurate ACCURATE 270046.4–51.5 gr2373.0–2697 fps—Federal 215

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