Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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>> | 82% | 56,376 psi | 88% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,522 psi | 90% | 3104 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3146 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 56,898 psi | 89% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,259 psi | 85% | 3143 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 56,768 psi | 89% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,361 psi | 87% | 3186 fps | 97.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3238 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,405 psi | 88% | 3255 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,609 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,244 psi | 85% | 3114 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,013 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,463 psi | 88% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,694 psi | 86% | 3169 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3232 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,852 psi | 83% | 3163 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,730 psi | 72% | 3074 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,014 psi | 89% | 3310 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,169 psi | 80% | 3146 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 55,071 psi | 86% | 3110 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3232 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 54,317 psi | 85% | 3087 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,419 psi | 87% | 3127 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,405 psi | 88% | 3196 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 88% | 55,912 psi | 88% | 3153 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,347 psi | 87% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,579 psi | 89% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,956 psi | 89% | 3235 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 57% | 1991 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,087 psi | 89% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,072 psi | 88% | 3107 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,172 psi | 86% | 3084 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 55,535 psi | 87% | 3123 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,927 psi | 88% | 3120 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 54,723 psi | 86% | 3136 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,680 psi | 87% | 3143 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,186 psi | 85% | 3205 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 57,624 psi | 90% | 3094 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,449 psi | 88% | 3100 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,289 psi | 88% | 3120 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 54,157 psi | 85% | 3104 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2979 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 57,624 psi | 90% | 3114 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,130 psi | 90% | 3159 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,521 psi | 89% | 3179 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 55,550 psi | 87% | 3261 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 56,666 psi | 89% | 3186 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,491 psi | 85% | 3127 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,752 psi | 86% | 3225 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 92% | 55,521 psi | 87% | 3182 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,907 psi | 77% | 3084 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 58% | 2034 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,274 psi | 87% | 3107 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,811 psi | 87% | 3225 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,273 psi | 85% | 3163 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,536 psi | 89% | 3255 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,107 psi | 71% | 3097 fps | 97% |
| Rottweil R 902 | <<locked>> | 82% | 54,839 psi | 86% | 3061 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,100 psi | 86% | 3107 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,029 psi | 89% | 3156 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 96% | 53,954 psi | 85% | 3156 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,317 psi | 85% | 3087 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,289 psi | 88% | 3120 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 56,449 psi | 88% | 3100 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,157 psi | 85% | 3104 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,782 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,566 psi | 90% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,014 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,970 psi | 88% | 3068 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,261 psi | 90% | 3215 fps | 98% |
| Somchem S355 | <<locked>> | 86% | 54,955 psi | 86% | 3100 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,188 psi | 88% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,621 psi | 86% | 3133 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,376 psi | 87% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,550 psi | 87% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,405 psi | 88% | 3077 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,969 psi | 86% | 3123 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,998 psi | 85% | 3104 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 57,363 psi | 90% | 3081 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,273 psi | 85% | 3127 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 55,288 psi | 87% | 3192 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,695 psi | 87% | 3245 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,694 psi | 86% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,623 psi | 89% | 3199 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,298 psi | 76% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,795 psi | 86% | 3123 fps | 97.4% |
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% | 52,968 psi | 83% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,459 psi | 79% | 2982 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 37,144 psi | 58% | 2772 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,169 psi | 79% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,290 psi | 60% | 2825 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,181 psi | 74% | 2956 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 48,472 psi | 76% | 3058 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 98% | 52,997 psi | 83% | 3169 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,504 psi | 82% | 3186 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,645 psi | 75% | 2979 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,850 psi | 80% | 3054 fps | 99.9% |
| Alliant Reloder-16 | 66.1 gr | 80% | 37,275 psi | 58% | 2835 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,453 psi | 67% | 2979 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,962 psi | 70% | 2982 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,571 psi | 71% | 3035 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,182 psi | 46% | 2621 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,389 psi | 55% | 2812 fps | 95.2% |
| Alliant Reloder-26 | 76.6 gr | 84% | 33,866 psi | 53% | 2812 fps | 95.4% |
| Bofors RP15 | <<locked>> | 98% | 47,848 psi | 75% | 3081 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,225 psi | 76% | 2992 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,571 psi | 71% | 3035 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,279 psi | 66% | 2848 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,472 psi | 76% | 3002 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 40,263 psi | 63% | 2874 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 46,122 psi | 72% | 2966 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,737 psi | 54% | 2720 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,026 psi | 83% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,351 psi | 66% | 2953 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,548 psi | 84% | 3074 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,632 psi | 78% | 2995 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,779 psi | 81% | 3022 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 43,047 psi | 67% | 2884 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,598 psi | 68% | 2881 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 36,825 psi | 58% | 2772 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 52,185 psi | 82% | 3084 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 50,662 psi | 79% | 3136 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 54,114 psi | 85% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,835 psi | 78% | 2992 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,249 psi | 65% | 2828 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 39,436 psi | 62% | 2805 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 38,377 psi | 60% | 2802 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 54,244 psi | 85% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,227 psi | 79% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,948 psi | 72% | 2982 fps | 95% |
| Norma MRP | 79.6 gr | 90% | 41,756 psi | 65% | 2986 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,072 psi | 60% | 2818 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,908 psi | 80% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 50,807 psi | 80% | 3150 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,014 psi | 58% | 2802 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 45,368 psi | 71% | 3012 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 43% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,530 psi | 76% | 2986 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,107 psi | 71% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,203 psi | 60% | 2844 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,043 psi | 58% | 2844 fps | 96.3% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,843 psi | 66% | 3012 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 51,605 psi | 81% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,324 psi | 71% | 2933 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 50,038 psi | 78% | 3028 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 47,137 psi | 74% | 3025 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 42,279 psi | 66% | 2848 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,249 psi | 65% | 2828 fps | 97.1% |
| Shooters World Precision | <<locked>> | 80% | 49,835 psi | 78% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,436 psi | 62% | 2805 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,615 psi | 73% | 2989 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,056 psi | 85% | 3084 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,499 psi | 73% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,350 psi | 63% | 2766 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,717 psi | 73% | 3022 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 45,614 psi | 71% | 2936 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 34,606 psi | 54% | 2776 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 41,872 psi | 66% | 2884 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,025 psi | 82% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,083 psi | 82% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,555 psi | 68% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,407 psi | 62% | 2822 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 44,121 psi | 69% | 2917 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 50,386 psi | 79% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,972 psi | 61% | 2822 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 32,401 psi | 51% | 2707 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 52,083 psi | 82% | 3179 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,667 psi | 61% | 2789 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 40,422 psi | 63% | 2881 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,702 psi | 43% | 2651 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,500 psi | 74% | 2992 fps | 95.7% |
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 97 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC. Alliant Reloder-26 delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,310 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 150.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2225, Baschieri & Pellagri 109 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.