Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 125gr | Sierra MatchKing 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 Hodgdon Superformance.
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 2015 | <<locked>> | 82% | 55,143 psi | 86% | 3245 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,853 psi | 86% | 3268 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,217 psi | 88% | 3337 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,014 psi | 89% | 3310 fps | 96.5% |
| Accurate 4064 | <<locked>> | 88% | 54,940 psi | 86% | 3317 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,303 psi | 87% | 3399 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 84% | 54,491 psi | 85% | 3343 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 90% | 55,782 psi | 87% | 3346 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,840 psi | 89% | 3350 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,563 psi | 86% | 3278 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,650 psi | 86% | 3471 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,202 psi | 88% | 3373 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,521 psi | 89% | 3396 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,246 psi | 88% | 3468 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,012 psi | 85% | 3445 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,439 psi | 68% | 3212 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,356 psi | 77% | 3406 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,563 psi | 86% | 3353 fps | 99.1% |
| Bofors RP3 | <<locked>> | 90% | 57,058 psi | 89% | 3389 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,898 psi | 89% | 3353 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,955 psi | 86% | 3278 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,000 psi | 89% | 3383 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,099 psi | 85% | 3337 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 94% | 54,244 psi | 85% | 3386 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 55,114 psi | 86% | 3360 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3386 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,201 psi | 87% | 3396 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,882 psi | 86% | 3419 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 56% | 2142 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,478 psi | 89% | 3363 fps | 99.9% |
| IMR 3031 | <<locked>> | 84% | 55,317 psi | 87% | 3350 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,172 psi | 86% | 3330 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,911 psi | 86% | 3297 fps | 96.9% |
| IMR 4350 | <<locked>> | 98% | 57,566 psi | 90% | 3379 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,013 psi | 86% | 3323 fps | 96.8% |
| IMR 4831 | <<locked>> | 98% | 55,941 psi | 88% | 3392 fps | 99.3% |
| IMR 4895 | <<locked>> | 86% | 54,476 psi | 85% | 3369 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 84% | 56,840 psi | 89% | 3350 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,810 psi | 86% | 3323 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,305 psi | 90% | 3327 fps | 99.8% |
| Lovex S062 | <<locked>> | 88% | 55,288 psi | 87% | 3327 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,795 psi | 86% | 3320 fps | 98.1% |
| Lovex S070 | <<locked>> | 96% | 55,985 psi | 88% | 3356 fps | 97.3% |
| Norma 201 | <<locked>> | 86% | 56,942 psi | 89% | 3350 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,392 psi | 90% | 3346 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,738 psi | 87% | 3379 fps | 99.8% |
| Norma URP | <<locked>> | 96% | 54,244 psi | 85% | 3383 fps | 99% |
| Ramshot Big Game | <<locked>> | 88% | 56,797 psi | 89% | 3406 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 98% | 56,811 psi | 89% | 3438 fps | 98.2% |
| Ramshot TAC | <<locked>> | 84% | 57,508 psi | 90% | 3366 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,276 psi | 90% | 3389 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,245 psi | 57% | 2192 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,418 psi | 85% | 3317 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,363 psi | 90% | 3471 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,493 psi | 90% | 3510 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,230 psi | 87% | 3419 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,404 psi | 85% | 3445 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 84% | 57,566 psi | 90% | 3330 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,319 psi | 90% | 3343 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,913 psi | 89% | 3379 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 56,898 psi | 89% | 3353 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,795 psi | 86% | 3320 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,810 psi | 86% | 3323 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,288 psi | 87% | 3327 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,985 psi | 88% | 3356 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,085 psi | 86% | 3383 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,057 psi | 88% | 3340 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,695 psi | 89% | 3369 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,549 psi | 85% | 3228 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,216 psi | 87% | 3225 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,071 psi | 86% | 3264 fps | 96.9% |
| Somchem S335 | <<locked>> | 86% | 57,638 psi | 90% | 3274 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,608 psi | 87% | 3330 fps | 99.7% |
| Somchem S355 | <<locked>> | 92% | 57,043 psi | 89% | 3376 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 3451 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 57,435 psi | 90% | 3238 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 54,882 psi | 86% | 3215 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,334 psi | 90% | 3307 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,505 psi | 85% | 3268 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,955 psi | 86% | 3297 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,521 psi | 89% | 3383 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 84% | 57,537 psi | 90% | 3353 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,376 psi | 88% | 3314 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,869 psi | 88% | 3386 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,124 psi | 75% | 3304 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,087 psi | 89% | 3356 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,244 psi | 85% | 3343 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,462 psi | 85% | 3392 fps | 96.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,001 psi | 61% | 3209 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,971 psi | 89% | 3379 fps | 100% |
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% | 51,938 psi | 81% | 3189 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,817 psi | 70% | 3094 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,315 psi | 82% | 3271 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,417 psi | 84% | 3248 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 42,380 psi | 66% | 3084 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 38,914 psi | 61% | 3058 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 47,921 psi | 75% | 3215 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,770 psi | 64% | 3038 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,024 psi | 78% | 3232 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 50,981 psi | 80% | 3222 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,106 psi | 69% | 3248 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,756 psi | 64% | 3064 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,569 psi | 68% | 3136 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 38,174 psi | 60% | 3064 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,433 psi | 56% | 3015 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 33,518 psi | 53% | 2946 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 39,595 psi | 62% | 3169 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,703 psi | 75% | 3219 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 40,727 psi | 64% | 3068 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 49,995 psi | 78% | 3222 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,503 psi | 81% | 3215 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,501 psi | 78% | 3248 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 41,379 psi | 65% | 3071 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 90% | 47,369 psi | 74% | 3248 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 48,443 psi | 76% | 3232 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 33,127 psi | 52% | 2884 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,846 psi | 70% | 3192 fps | 99.1% |
| Hodgdon Superformance | 84.2 gr | 92% | 51,039 psi | 80% | 3346 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 42% | 1923 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,427 psi | 73% | 3173 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 48,414 psi | 76% | 3232 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,815 psi | 67% | 3081 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 48,385 psi | 76% | 3169 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 50,676 psi | 79% | 3251 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,689 psi | 76% | 3199 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 37,376 psi | 59% | 3002 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 44,686 psi | 70% | 3173 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,024 psi | 78% | 3232 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 47,790 psi | 75% | 3199 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,471 psi | 74% | 3146 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 42,801 psi | 67% | 3084 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 42,757 psi | 67% | 3074 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 46,238 psi | 72% | 3166 fps | 95% |
| Norma 201 | <<locked>> | 80% | 46,963 psi | 74% | 3166 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 47,485 psi | 74% | 3176 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,960 psi | 67% | 3123 fps | 98% |
| Norma URP | <<locked>> | 86% | 38,798 psi | 61% | 3054 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 42,844 psi | 67% | 3136 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 46,383 psi | 73% | 3235 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 50,227 psi | 79% | 3232 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,082 psi | 78% | 3258 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,934 psi | 42% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 47,543 psi | 75% | 3179 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,499 psi | 73% | 3264 fps | 98.2% |
| ReloadSwiss RS 60 | 69.3 gr | 80% | 37,710 psi | 59% | 3097 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 38,696 psi | 61% | 3071 fps | 95% |
| ReloadSwiss RS 70 | 77.4 gr | 88% | 41,133 psi | 64% | 3150 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,879 psi | 80% | 3219 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,773 psi | 70% | 3110 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 38,130 psi | 60% | 2999 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 90% | 49,995 psi | 78% | 3222 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,757 psi | 67% | 3074 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,790 psi | 75% | 3199 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,801 psi | 67% | 3084 fps | 99% |
| Shooters World SW4350 | <<locked>> | 90% | 46,238 psi | 72% | 3166 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,262 psi | 62% | 3054 fps | 96.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,878 psi | 77% | 3205 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,615 psi | 73% | 3179 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,138 psi | 75% | 3117 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,306 psi | 63% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 48,240 psi | 76% | 3136 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 47,805 psi | 75% | 3114 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,559 psi | 76% | 3202 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 38,827 psi | 61% | 3005 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 30,400 psi | 48% | 2861 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 54,128 psi | 85% | 3189 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,544 psi | 76% | 3107 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,454 psi | 70% | 3094 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,904 psi | 70% | 3097 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,999 psi | 58% | 2933 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 40,553 psi | 64% | 3061 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 50,430 psi | 79% | 3228 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 43,482 psi | 68% | 3081 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 39,943 psi | 63% | 3054 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 92% | 36,753 psi | 58% | 3041 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,924 psi | 52% | 2835 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 50,473 psi | 79% | 3278 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 47,558 psi | 75% | 3255 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 34,069 psi | 53% | 3048 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,282 psi | 73% | 3182 fps | 99% |
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 109 powders for .300 Weath. Mag. loaded with the .308 | 125gr | Sierra MatchKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,510 fps; across all powders the maximum-charge window runs from 2,142 fps to 3,510 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 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 125.0 gr projectile in 0.308" calls for a 1:12.0 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, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 125gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.