Warning: Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet length will alter net case capacity, pressure and velocity. Primer selection is specific and primer types are not interchangeable. These are maximum loads in my firearms and may be excessive in others. All loads should be reduced by 5% as a starting point for development where cartridges have greater than 40 grains in capacity and 10% for cartridges with less than 40 grain capacity following safe handloading practices as represented in established mainstream reloading manuals. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.
Cartridge |
375 Ruger |
Firearm | Ruger Guide Gun |
Barrel Length | 20″ |
Min – Max Case Length | 2.580″ +0.000″/-0.020″ |
Min – Max Cartridge Overall Length | 3.280″ – 3.340″ |
Primer |
LRM |
Bullet Diameter | 0.3760 +0.000″/-0.003″ |
Reloading Dies | Hornady FL |
Bullet Type | Bullet Weight Grains |
Net H2O Grains Capacity |
COL” | Powder Type | Powder Charge Grains |
Muzzle Velocity fps |
Muzzle Energy ft/lbs |
Sierra Pro-Hunter |
200 | 90.5 | 3.100 | IMR Trail Boss | 27.0 | 1762 | 1379 |
Sierra Pro-Hunter | 200 | 90.5 | 3.100 | IMR 3031 | 52.0 | 2146 | 2046 |
Sierra Pro-Hunter |
200 | 90.5 | 3.100 | Reloder 10 | 50.0 | 2227 | 2203 |
Sierra Pro-Hunter |
200 | 90.5 | 3.100 | IMR 4198 | 46.0 | 2205 | 2160 |
Hornady SP |
225 | 87.7 | 3.275 | IMR Trail Boss |
27.0 |
1626 |
1321 |
Hornady SP |
225 | 87.7 | 3.275 | IMR 3031 | 52.0 | 1948 | 1896 |
Hornady SP |
225 | 87.7 | 3.275 | Reloder10 | 51.0 | 2117 | 2240 |
Hornady SP |
225 | 87.7 | 3.275 | IMR 4198 | 47.0 | 2243 | 2514 |
Speer SP |
235 | 89.3 | 3.275 | IMR Trail Boss |
27.0 |
1661 |
1440 |
Speer SP |
235 | 89.3 | 3.275 | IMR 3031 | 55.0 | 2130 | 2368 |
Speer SP |
235 | 89.3 | 3.275 | Reloder10 | 52.0 | 2182 | 2385 |
Speer SP |
235 | 89.3 | 3.275 | IMR 4198 | 48.0 | 2271 | 2692 |
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