Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 125gr | Barnes X S bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,882 psi | 86% | 3251 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,911 psi | 86% | 3271 fps | 96.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 3307 fps | 97.7% |
| Accurate 4064 | <<locked>> | 84% | 54,969 psi | 86% | 3304 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,795 psi | 86% | 3379 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 82% | 56,362 psi | 88% | 3369 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 88% | 57,246 psi | 90% | 3366 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,376 psi | 88% | 3497 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,853 psi | 86% | 3343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,114 psi | 86% | 3363 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,592 psi | 86% | 3435 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,101 psi | 88% | 3471 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 3323 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3533 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,115 psi | 88% | 3376 fps | 99.4% |
| Bofors RP3 | <<locked>> | 86% | 56,101 psi | 88% | 3363 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 55,259 psi | 87% | 3320 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 86% | 56,260 psi | 88% | 3369 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 92% | 56,550 psi | 89% | 3425 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 90% | 56,101 psi | 88% | 3376 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 56,985 psi | 89% | 3383 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,187 psi | 86% | 3360 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,014 psi | 89% | 3415 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,898 psi | 89% | 3458 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 2165 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,609 psi | 90% | 3379 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,392 psi | 90% | 3369 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,695 psi | 89% | 3350 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,115 psi | 88% | 3320 fps | 97.4% |
| IMR 4350 | <<locked>> | 94% | 55,724 psi | 87% | 3343 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,492 psi | 89% | 3350 fps | 97.4% |
| IMR 4831 | <<locked>> | 94% | 55,013 psi | 86% | 3366 fps | 99.3% |
| IMR 4895 | <<locked>> | 84% | 56,521 psi | 89% | 3399 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 82% | 57,174 psi | 90% | 3350 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,882 psi | 86% | 3281 fps | 99.8% |
| Lovex S062 | <<locked>> | 86% | 57,377 psi | 90% | 3353 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,927 psi | 89% | 3350 fps | 98.6% |
| Lovex S070 | <<locked>> | 92% | 54,940 psi | 86% | 3337 fps | 97.4% |
| Norma 201 | <<locked>> | 82% | 55,448 psi | 87% | 3314 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,782 psi | 87% | 3310 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,476 psi | 85% | 3350 fps | 99.8% |
| Norma MRPᴾ | <<locked>> | 100% | 55,129 psi | 86% | 3474 fps | 97.2% |
| Norma URP | <<locked>> | 94% | 56,652 psi | 89% | 3419 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 84% | 54,926 psi | 86% | 3366 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 94% | 55,448 psi | 87% | 3409 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,028 psi | 58% | 2215 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,912 psi | 88% | 3337 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,506 psi | 87% | 3432 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,550 psi | 87% | 3474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,288 psi | 85% | 3396 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,434 psi | 88% | 3481 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 84% | 56,130 psi | 88% | 3317 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,086 psi | 88% | 3356 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3435 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 90% | 55,259 psi | 87% | 3320 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,927 psi | 89% | 3350 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,174 psi | 90% | 3350 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,377 psi | 90% | 3353 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,940 psi | 86% | 3337 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,913 psi | 89% | 3409 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,607 psi | 86% | 3327 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,753 psi | 87% | 3241 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,608 psi | 89% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,913 psi | 89% | 3297 fps | 97.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3425 fps | 96.1% |
| Somchem S335 | <<locked>> | 82% | 55,782 psi | 87% | 3241 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,203 psi | 90% | 3350 fps | 99.9% |
| Somchem S355 | <<locked>> | 88% | 55,956 psi | 88% | 3350 fps | 99.9% |
| Somchem S365 | <<locked>> | 96% | 55,622 psi | 87% | 3428 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,926 psi | 86% | 3350 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 82% | 56,057 psi | 88% | 3225 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,144 psi | 88% | 3281 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,289 psi | 88% | 3287 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,159 psi | 90% | 3323 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,187 psi | 86% | 3353 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 84% | 54,636 psi | 86% | 3278 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,578 psi | 86% | 3356 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,100 psi | 86% | 3422 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,911 psi | 86% | 3317 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,753 psi | 89% | 3428 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,889 psi | 70% | 3366 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,940 psi | 86% | 3340 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,547 psi | 81% | 3199 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 51,532 psi | 81% | 3205 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 43,511 psi | 68% | 3117 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,675 psi | 76% | 3192 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,956 psi | 58% | 2992 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 52,881 psi | 83% | 3307 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 44,976 psi | 70% | 3127 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,066 psi | 77% | 3353 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,600 psi | 71% | 3163 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,573 psi | 76% | 3238 fps | 98.8% |
| Alliant Reloder-16 | 68.4 gr | 82% | 37,913 psi | 59% | 3051 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,205 psi | 63% | 3136 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 34,171 psi | 54% | 2953 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 90% | 39,755 psi | 62% | 3163 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,678 psi | 83% | 3310 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 46,354 psi | 73% | 3179 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 48,936 psi | 77% | 3196 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,485 psi | 73% | 3176 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 46,586 psi | 73% | 3225 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 52,794 psi | 83% | 3310 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 53,417 psi | 84% | 3320 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,417 psi | 52% | 2881 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,009 psi | 78% | 3291 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 49,414 psi | 77% | 3307 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 43% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,937 psi | 80% | 3258 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 53,824 psi | 84% | 3314 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,297 psi | 74% | 3173 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,574 psi | 78% | 3192 fps | 95.9% |
| IMR 4350 | <<locked>> | 90% | 49,385 psi | 77% | 3222 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 47,210 psi | 74% | 3163 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 37,753 psi | 59% | 2999 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 49,748 psi | 78% | 3271 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 80% | 53,519 psi | 84% | 3291 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,837 psi | 81% | 3225 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 47,950 psi | 75% | 3179 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 42,380 psi | 66% | 3054 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 45,847 psi | 72% | 3150 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,141 psi | 82% | 3255 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 52,460 psi | 82% | 3255 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,979 psi | 75% | 3222 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 48,211 psi | 76% | 3333 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 38,798 psi | 61% | 3045 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 48,008 psi | 75% | 3235 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 42,888 psi | 67% | 3146 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 43% | 1985 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,398 psi | 73% | 3146 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,098 psi | 82% | 3366 fps | 99.2% |
| ReloadSwiss RS 60 | 71.9 gr | 80% | 42,540 psi | 67% | 3209 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 38,885 psi | 61% | 3064 fps | 95.3% |
| ReloadSwiss RS 70 | 76.7 gr | 84% | 40,524 psi | 64% | 3130 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 49,908 psi | 78% | 3202 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 43,714 psi | 69% | 3117 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 53,766 psi | 84% | 3369 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 48,936 psi | 77% | 3196 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 42,380 psi | 66% | 3054 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,519 psi | 84% | 3291 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,950 psi | 75% | 3179 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 45,847 psi | 72% | 3150 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,179 psi | 69% | 3159 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,416 psi | 81% | 3268 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,591 psi | 82% | 3189 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,556 psi | 70% | 3028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 47,108 psi | 74% | 3107 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,272 psi | 83% | 3360 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 52,533 psi | 82% | 3186 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,592 psi | 84% | 3291 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 43,830 psi | 69% | 3114 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 33,199 psi | 52% | 2933 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 51,401 psi | 81% | 3281 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,881 psi | 83% | 3176 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,661 psi | 78% | 3173 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,806 psi | 78% | 3176 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,901 psi | 66% | 3035 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 37,681 psi | 59% | 2979 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,283 psi | 76% | 3163 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 39,943 psi | 63% | 3045 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 35,375 psi | 55% | 2986 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,188 psi | 58% | 2946 fps | 97.5% |
| Winchester 760 | <<locked>> | 86% | 46,775 psi | 73% | 3228 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 32,663 psi | 51% | 2992 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,445 psi | 81% | 3274 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 82 powders for .300 Weath. Mag. loaded with the .308 | 125gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 3,533 fps; across all powders the maximum-charge window runs from 2,165 fps to 3,533 fps. Accurate 3100 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 125gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.