Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 115gr | Sierra VarmintKing bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, ReloadSwiss RS 60 and Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
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 2015 | <<locked>> | 84% | 57,740 psi | 90% | 3406 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,232 psi | 90% | 3428 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,984 psi | 86% | 3435 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 57,406 psi | 90% | 3481 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,186 psi | 85% | 3494 fps | 98.6% |
| ADI AR 2206H | <<locked>> | 86% | 57,087 psi | 89% | 3510 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 90% | 54,824 psi | 86% | 3445 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,854 psi | 88% | 3455 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 84% | 57,130 psi | 90% | 3442 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,638 psi | 90% | 3645 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,085 psi | 86% | 3474 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,477 psi | 87% | 3494 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,071 psi | 86% | 3563 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,681 psi | 89% | 3606 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,525 psi | 67% | 3291 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,327 psi | 76% | 3484 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,377 psi | 90% | 3520 fps | 99.1% |
| Bofors RP3 | <<locked>> | 90% | 55,970 psi | 88% | 3488 fps | 99.9% |
| Bofors RP7 | <<locked>> | 94% | 55,854 psi | 88% | 3445 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,348 psi | 90% | 3442 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,825 psi | 87% | 3481 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,724 psi | 89% | 3501 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 96% | 56,927 psi | 89% | 3547 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 57,711 psi | 90% | 3524 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,071 psi | 86% | 3478 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,983 psi | 85% | 3491 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 56% | 2241 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,405 psi | 87% | 3465 fps | 99.7% |
| IMR 3031 | <<locked>> | 84% | 54,186 psi | 85% | 3455 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,740 psi | 90% | 3491 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,595 psi | 90% | 3461 fps | 96.8% |
| IMR 4350 | <<locked>> | 98% | 56,594 psi | 89% | 3471 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,624 psi | 90% | 3484 fps | 96.7% |
| IMR 4831 | <<locked>> | 98% | 54,824 psi | 86% | 3484 fps | 98.8% |
| IMR 4895 | <<locked>> | 88% | 56,855 psi | 89% | 3530 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 84% | 55,854 psi | 88% | 3455 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 86% | 57,450 psi | 90% | 3488 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,246 psi | 88% | 3428 fps | 99.6% |
| Lovex S062 | <<locked>> | 88% | 54,186 psi | 85% | 3425 fps | 99.9% |
| Lovex S065 | <<locked>> | 96% | 57,305 psi | 90% | 3478 fps | 98% |
| Lovex S070 | <<locked>> | 96% | 54,926 psi | 86% | 3451 fps | 96.5% |
| Norma 201 | <<locked>> | 86% | 55,738 psi | 87% | 3448 fps | 99.9% |
| Norma 202 | <<locked>> | 86% | 56,362 psi | 88% | 3455 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,694 psi | 86% | 3478 fps | 99.4% |
| Norma URP | <<locked>> | 98% | 56,782 psi | 89% | 3547 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 88% | 55,767 psi | 87% | 3504 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 98% | 55,709 psi | 87% | 3530 fps | 97.4% |
| Ramshot TAC | <<locked>> | 84% | 56,405 psi | 88% | 3461 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,159 psi | 88% | 3488 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,782 psi | 89% | 3451 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 56% | 2290 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,116 psi | 90% | 3478 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,130 psi | 88% | 3573 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,173 psi | 88% | 3612 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,114 psi | 85% | 3510 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,464 psi | 90% | 3615 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 84% | 56,478 psi | 89% | 3438 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,289 psi | 88% | 3448 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 92% | 55,811 psi | 87% | 3478 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 94% | 55,854 psi | 88% | 3445 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,305 psi | 90% | 3478 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,450 psi | 90% | 3488 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,186 psi | 85% | 3425 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 96% | 54,926 psi | 86% | 3451 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,128 psi | 85% | 3481 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,129 psi | 86% | 3438 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,622 psi | 87% | 3468 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,956 psi | 89% | 3389 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,711 psi | 90% | 3383 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,085 psi | 85% | 3356 fps | 96.1% |
| Somchem S321 | <<locked>> | 82% | 57,392 psi | 90% | 3491 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,521 psi | 89% | 3383 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,679 psi | 86% | 3428 fps | 99.4% |
| Somchem S355 | <<locked>> | 92% | 56,072 psi | 88% | 3478 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3550 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 56,478 psi | 89% | 3350 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,232 psi | 90% | 3373 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,289 psi | 88% | 3419 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,043 psi | 89% | 3428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,624 psi | 90% | 3455 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,564 psi | 87% | 3478 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 84% | 56,536 psi | 89% | 3458 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,492 psi | 87% | 3415 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,781 psi | 86% | 3478 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 3389 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,956 psi | 88% | 3448 fps | 99.9% |
| Winchester 748 | <<locked>> | 84% | 56,913 psi | 89% | 3510 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,130 psi | 90% | 3553 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,232 psi | 60% | 3278 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,738 psi | 87% | 3478 fps | 99.8% |
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 2015 | <<locked>> | 80% | 50,865 psi | 80% | 3297 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,801 psi | 69% | 3192 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,271 psi | 80% | 3373 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 41,408 psi | 65% | 3176 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 40,698 psi | 64% | 3205 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 47,094 psi | 74% | 3314 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 40,016 psi | 63% | 3123 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,197 psi | 77% | 3330 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 49,922 psi | 78% | 3330 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,308 psi | 68% | 3337 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,871 psi | 62% | 3150 fps | 97.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,757 psi | 67% | 3225 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 39,972 psi | 63% | 3219 fps | 95.2% |
| Alliant Reloder-17 | 73.6 gr | 82% | 37,086 psi | 58% | 3163 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 94% | 34,911 psi | 55% | 3084 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 41,756 psi | 65% | 3323 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,673 psi | 73% | 3307 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 39,682 psi | 62% | 3150 fps | 97.5% |
| Bofors RP7 | <<locked>> | 92% | 52,373 psi | 82% | 3379 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,821 psi | 80% | 3323 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,675 psi | 76% | 3350 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 82% | 43,279 psi | 68% | 3222 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 92% | 49,676 psi | 78% | 3406 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,572 psi | 75% | 3330 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 34,490 psi | 54% | 3022 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,758 psi | 69% | 3281 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 41% | 2011 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,629 psi | 72% | 3268 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 47,384 psi | 74% | 3333 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,959 psi | 66% | 3169 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 50,575 psi | 79% | 3327 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 52,881 psi | 83% | 3402 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 50,807 psi | 80% | 3353 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 41,901 psi | 66% | 3215 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 43,816 psi | 69% | 3264 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 49,197 psi | 77% | 3330 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 46,717 psi | 73% | 3294 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 46,673 psi | 73% | 3241 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 41,930 psi | 66% | 3173 fps | 98.3% |
| Lovex S065 | <<locked>> | 88% | 44,570 psi | 70% | 3219 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 51,503 psi | 81% | 3386 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,050 psi | 72% | 3261 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 46,499 psi | 73% | 3271 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,134 psi | 66% | 3212 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 40,567 psi | 64% | 3202 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 42,105 psi | 66% | 3225 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 48,617 psi | 76% | 3389 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 49,443 psi | 77% | 3323 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,066 psi | 77% | 3353 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,171 psi | 83% | 3386 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,701 psi | 42% | 2054 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 49,937 psi | 78% | 3337 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,353 psi | 71% | 3350 fps | 97.3% |
| ReloadSwiss RS 60 | 71.8 gr | 80% | 36,796 psi | 58% | 3173 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 43,569 psi | 68% | 3291 fps | 95.9% |
| ReloadSwiss RS 70 | 82.1 gr | 90% | 43,250 psi | 68% | 3304 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,053 psi | 78% | 3323 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,743 psi | 69% | 3199 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,391 psi | 59% | 3084 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 52,373 psi | 82% | 3379 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,570 psi | 70% | 3219 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,717 psi | 73% | 3294 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 41,930 psi | 66% | 3173 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 94% | 51,503 psi | 81% | 3386 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,319 psi | 60% | 3133 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,848 psi | 75% | 3294 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,629 psi | 72% | 3268 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,253 psi | 74% | 3215 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,479 psi | 62% | 3045 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 50,473 psi | 79% | 3287 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 53,664 psi | 84% | 3425 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 46,949 psi | 74% | 3212 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,529 psi | 74% | 3291 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 37,985 psi | 60% | 3091 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 31,720 psi | 50% | 2995 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 53,156 psi | 83% | 3297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,601 psi | 75% | 3212 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,468 psi | 68% | 3189 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,135 psi | 69% | 3192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,289 psi | 57% | 3015 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 42,322 psi | 66% | 3209 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 49,342 psi | 77% | 3323 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 42,670 psi | 67% | 3173 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 41,901 psi | 66% | 3205 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 94% | 38,276 psi | 60% | 3182 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 34,447 psi | 54% | 2972 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 49,501 psi | 78% | 3376 fps | 99.8% |
| Winchester 760 | <<locked>> | 92% | 49,864 psi | 78% | 3412 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 35,679 psi | 56% | 3189 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,382 psi | 71% | 3274 fps | 98.5% |
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 108 powders for .300 Weath. Mag. loaded with the .308 | 115gr | Sierra VarmintKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,645 fps; across all powders the maximum-charge window runs from 2,241 fps to 3,645 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 70, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 Weath. Mag. with the .308 | 115gr | Sierra VarmintKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.