Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 135gr | Sierra HPBT 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 Alliant Reloder-16, ReloadSwiss RS 70 and Ramshot Hunter.
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 2495 | <<locked>> | 84% | 56,608 psi | 89% | 3189 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,505 psi | 85% | 3186 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 3212 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 56,985 psi | 89% | 3248 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,041 psi | 85% | 3284 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 82% | 55,782 psi | 87% | 3271 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,203 psi | 90% | 3278 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 55,332 psi | 87% | 3320 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,652 psi | 89% | 3412 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,404 psi | 85% | 3245 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,679 psi | 86% | 3268 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,737 psi | 86% | 3350 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,304 psi | 88% | 3379 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,679 psi | 86% | 3304 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 3235 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,583 psi | 67% | 3120 fps | 96.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,463 psi | 88% | 3448 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,028 psi | 88% | 3284 fps | 99.8% |
| Bofors RP3 | <<locked>> | 86% | 55,259 psi | 87% | 3264 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 54,824 psi | 86% | 3232 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 86% | 55,782 psi | 87% | 3278 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 56,536 psi | 89% | 3340 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 90% | 56,347 psi | 88% | 3297 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 56,449 psi | 88% | 3284 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,216 psi | 87% | 3268 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,985 psi | 89% | 3323 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,058 psi | 89% | 3376 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 2090 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,580 psi | 90% | 3284 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,159 psi | 90% | 3268 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,536 psi | 89% | 3258 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,927 psi | 88% | 3232 fps | 98.1% |
| IMR 4350 | <<locked>> | 94% | 55,680 psi | 87% | 3261 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,492 psi | 89% | 3264 fps | 98.1% |
| IMR 4831 | <<locked>> | 94% | 54,592 psi | 86% | 3274 fps | 99.6% |
| IMR 4895 | <<locked>> | 84% | 56,130 psi | 88% | 3304 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,391 psi | 88% | 3245 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,665 psi | 86% | 3192 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,782 psi | 89% | 3255 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,449 psi | 88% | 3261 fps | 99.1% |
| Lovex S070 | <<locked>> | 92% | 54,360 psi | 85% | 3245 fps | 98% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,062 psi | 67% | 3031 fps | 96.2% |
| Norma 201 | <<locked>> | 82% | 54,578 psi | 86% | 3212 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,288 psi | 87% | 3212 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,508 psi | 90% | 3310 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,710 psi | 89% | 3317 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 55,129 psi | 86% | 3389 fps | 98% |
| Norma URP | <<locked>> | 94% | 56,550 psi | 89% | 3333 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 84% | 54,795 psi | 86% | 3274 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 94% | 55,463 psi | 87% | 3323 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 58% | 2139 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,608 psi | 87% | 3251 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,405 psi | 87% | 3340 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,753 psi | 87% | 3379 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,070 psi | 85% | 3304 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,550 psi | 89% | 3399 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 55,347 psi | 87% | 3215 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,332 psi | 87% | 3258 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3353 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 90% | 54,824 psi | 86% | 3232 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,449 psi | 88% | 3261 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,391 psi | 88% | 3245 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,782 psi | 89% | 3255 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,360 psi | 85% | 3245 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,101 psi | 89% | 3320 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,435 psi | 90% | 3274 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,331 psi | 85% | 3238 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,376 psi | 87% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,434 psi | 88% | 3146 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,333 psi | 88% | 3205 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 3346 fps | 97% |
| Somchem S335 | <<locked>> | 82% | 55,143 psi | 86% | 3140 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,014 psi | 89% | 3261 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,361 psi | 87% | 3255 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,637 psi | 87% | 3333 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,534 psi | 85% | 3264 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 82% | 55,869 psi | 88% | 3130 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,390 psi | 87% | 3176 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,970 psi | 88% | 3189 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,811 psi | 89% | 3228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,013 psi | 86% | 3264 fps | 99.6% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 3166 fps | 96% |
| Vihtavuori N540 | <<locked>> | 84% | 54,157 psi | 85% | 3179 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,172 psi | 85% | 3264 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 3323 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,926 psi | 86% | 3228 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,739 psi | 89% | 3343 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,179 psi | 69% | 3274 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,650 psi | 86% | 3245 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3255 fps | 96.3% |
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% | 49,588 psi | 78% | 3081 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,645 psi | 75% | 3054 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 42,163 psi | 66% | 3015 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 46,920 psi | 74% | 3077 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,491 psi | 56% | 2881 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 52,388 psi | 82% | 3212 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 44,498 psi | 70% | 3038 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 51,779 psi | 81% | 3251 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,965 psi | 77% | 3268 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,831 psi | 70% | 3064 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,950 psi | 75% | 3140 fps | 99.2% |
| Alliant Reloder-16 | 66.9 gr | 80% | 34,780 psi | 55% | 2890 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,494 psi | 62% | 3041 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 51,242 psi | 80% | 3238 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,951 psi | 49% | 2792 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 39,929 psi | 63% | 3051 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 88% | 36,158 psi | 57% | 2999 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,417 psi | 82% | 3222 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 45,165 psi | 71% | 3077 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 45,237 psi | 71% | 3045 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 45,556 psi | 71% | 3077 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 84% | 43,033 psi | 67% | 3068 fps | 95% |
| Hodgdon H4350 | <<locked>> | 86% | 49,414 psi | 77% | 3166 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,939 psi | 83% | 3225 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,329 psi | 51% | 2782 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,690 psi | 78% | 3196 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 45,687 psi | 72% | 3153 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 42% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,676 psi | 79% | 3166 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 53,447 psi | 84% | 3212 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,789 psi | 73% | 3081 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,168 psi | 77% | 3104 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 46,050 psi | 72% | 3077 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,947 psi | 69% | 3018 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 34,258 psi | 54% | 2831 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 49,139 psi | 77% | 3176 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 52,663 psi | 83% | 3186 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,561 psi | 81% | 3136 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 47,079 psi | 74% | 3084 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 38,725 psi | 61% | 2894 fps | 95.1% |
| Lovex S070 | <<locked>> | 84% | 42,163 psi | 66% | 2992 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 40,350 psi | 63% | 2972 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 51,213 psi | 80% | 3156 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,866 psi | 81% | 3156 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,326 psi | 74% | 3127 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 52,881 psi | 83% | 3248 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 44,686 psi | 70% | 3176 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,462 psi | 56% | 2881 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,645 psi | 75% | 3143 fps | 99.4% |
| Ramshot Hunter | 76.3 gr | 86% | 42,308 psi | 66% | 3058 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 43% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,730 psi | 72% | 3061 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,822 psi | 81% | 3274 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,959 psi | 66% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 37,898 psi | 59% | 2966 fps | 95.9% |
| ReloadSwiss RS 70 | 76.9 gr | 84% | 39,827 psi | 62% | 3041 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 48,863 psi | 77% | 3104 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,467 psi | 67% | 3012 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 96% | 50,154 psi | 79% | 3219 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 45,237 psi | 71% | 3045 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,725 psi | 61% | 2894 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,663 psi | 83% | 3186 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,079 psi | 74% | 3084 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 42,163 psi | 66% | 2992 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,627 psi | 68% | 3068 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,447 psi | 84% | 3205 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,039 psi | 80% | 3176 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,098 psi | 82% | 3094 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,918 psi | 69% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 43,366 psi | 68% | 2956 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 49,705 psi | 78% | 3212 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 51,808 psi | 81% | 3087 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,345 psi | 84% | 3199 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 42,801 psi | 67% | 3012 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 31,879 psi | 50% | 2825 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 47,674 psi | 75% | 3133 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,576 psi | 82% | 3077 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,878 psi | 77% | 3071 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,240 psi | 77% | 3081 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,930 psi | 64% | 2936 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 36,811 psi | 58% | 2884 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 98% | 47,021 psi | 74% | 3100 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 47,587 psi | 75% | 3068 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,390 psi | 57% | 2884 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 34,069 psi | 53% | 2881 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,347 psi | 57% | 2854 fps | 98% |
| Winchester 760 | <<locked>> | 84% | 43,178 psi | 68% | 3071 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 31,343 psi | 49% | 2890 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,053 psi | 80% | 3182 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,053 psi | 80% | 3189 fps | 95.4% |
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 106 powders for .300 Weath. Mag. loaded with the .308 | 135gr | Sierra HPBT MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,448 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 135.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. Alliant Reloder-16, ReloadSwiss RS 70, Ramshot Hunter rank at the top here: for .300 Weath. Mag. with the .308 | 135gr | Sierra HPBT MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.