Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Swift A-Frame bullet and 85 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% | 56,623 psi | 89% | 3038 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,740 psi | 90% | 3107 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3150 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 56,971 psi | 89% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,505 psi | 85% | 3150 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 56,768 psi | 89% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,347 psi | 87% | 3186 fps | 97.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3241 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,420 psi | 88% | 3255 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,244 psi | 85% | 3097 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,447 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,042 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,478 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,882 psi | 86% | 3176 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3235 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3163 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,919 psi | 72% | 3074 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,217 psi | 90% | 3317 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,387 psi | 81% | 3153 fps | 96.8% |
| Bofors RP3 | <<locked>> | 84% | 55,288 psi | 87% | 3114 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3235 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 54,505 psi | 85% | 3091 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,434 psi | 87% | 3130 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,594 psi | 89% | 3199 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 56,101 psi | 88% | 3156 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 98% | 57,014 psi | 89% | 3182 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,579 psi | 87% | 3130 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,811 psi | 89% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 57,188 psi | 90% | 3238 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 57% | 1988 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,305 psi | 90% | 3133 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,289 psi | 88% | 3110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,361 psi | 87% | 3087 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 55,767 psi | 87% | 3127 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,144 psi | 88% | 3123 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 54,984 psi | 86% | 3140 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,898 psi | 88% | 3150 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3205 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 57,667 psi | 90% | 3097 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,478 psi | 89% | 3104 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,304 psi | 88% | 3120 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 57,711 psi | 90% | 3163 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,818 psi | 73% | 2982 fps | 98.1% |
| Norma 203B | <<locked>> | 84% | 57,348 psi | 90% | 3159 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,521 psi | 89% | 3179 fps | 97.6% |
| Norma MRP | <<locked>> | 98% | 55,709 psi | 87% | 3264 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 56,637 psi | 89% | 3189 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,476 psi | 85% | 3127 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,752 psi | 86% | 3225 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 92% | 55,550 psi | 87% | 3186 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,095 psi | 77% | 3087 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 58% | 2037 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,463 psi | 87% | 3110 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,028 psi | 88% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,317 psi | 85% | 3166 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,710 psi | 89% | 3261 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,092 psi | 71% | 3094 fps | 97% |
| Rottweil R 902 | <<locked>> | 82% | 55,042 psi | 86% | 3064 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,332 psi | 87% | 3110 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,029 psi | 89% | 3156 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 98% | 57,711 psi | 90% | 3219 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 54,505 psi | 85% | 3091 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,304 psi | 88% | 3120 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 56,478 psi | 89% | 3104 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,711 psi | 90% | 3163 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,000 psi | 89% | 3173 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,043 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,927 psi | 88% | 3068 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,217 psi | 90% | 3212 fps | 98% |
| Somchem S355 | <<locked>> | 86% | 55,201 psi | 87% | 3104 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,173 psi | 88% | 3192 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,853 psi | 86% | 3136 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,376 psi | 87% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,564 psi | 87% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,608 psi | 89% | 3077 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,230 psi | 87% | 3127 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,143 psi | 85% | 3107 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 57,348 psi | 90% | 3081 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,244 psi | 85% | 3127 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 55,317 psi | 87% | 3192 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,927 psi | 88% | 3248 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,882 psi | 86% | 3087 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,869 psi | 89% | 3205 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,240 psi | 76% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,984 psi | 86% | 3127 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% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,473 psi | 79% | 2982 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 37,289 psi | 58% | 2776 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,212 psi | 79% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,508 psi | 60% | 2828 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,224 psi | 74% | 2956 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 45,498 psi | 71% | 2995 fps | 95% |
| ADI AR 2213 | <<locked>> | 98% | 53,214 psi | 83% | 3173 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,518 psi | 82% | 3189 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,863 psi | 75% | 2986 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,097 psi | 80% | 3058 fps | 99.9% |
| Alliant Reloder-16 | 66.2 gr | 80% | 37,304 psi | 58% | 2838 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,496 psi | 67% | 2979 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,121 psi | 71% | 2986 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,571 psi | 71% | 3035 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,312 psi | 46% | 2621 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,520 psi | 56% | 2818 fps | 95.3% |
| Alliant Reloder-26 | 76.7 gr | 84% | 33,895 psi | 53% | 2815 fps | 95.5% |
| Bofors RP15 | <<locked>> | 96% | 44,933 psi | 70% | 3022 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 48,269 psi | 76% | 2995 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,571 psi | 71% | 3035 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,293 psi | 66% | 2848 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,675 psi | 76% | 3009 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 40,466 psi | 63% | 2881 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 46,122 psi | 72% | 2966 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 53,258 psi | 83% | 3117 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,925 psi | 55% | 2726 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,026 psi | 83% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,511 psi | 67% | 2956 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,766 psi | 84% | 3074 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,617 psi | 78% | 2995 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,779 psi | 81% | 3022 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 43,192 psi | 68% | 2887 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,772 psi | 69% | 2884 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 36,869 psi | 58% | 2776 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 52,402 psi | 82% | 3091 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 50,618 psi | 79% | 3136 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 54,128 psi | 85% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,835 psi | 78% | 2992 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,278 psi | 65% | 2831 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 39,450 psi | 62% | 2805 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 38,392 psi | 60% | 2805 fps | 95.9% |
| Norma 203B | <<locked>> | 80% | 50,444 psi | 79% | 3045 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,151 psi | 72% | 2986 fps | 95.1% |
| Norma MRP | 79.8 gr | 90% | 41,945 psi | 66% | 2986 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,101 psi | 60% | 2822 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,908 psi | 80% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,010 psi | 80% | 3156 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,043 psi | 58% | 2802 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 96% | 42,308 psi | 66% | 2943 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 44% | 1827 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,515 psi | 76% | 2986 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,121 psi | 71% | 3041 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,232 psi | 60% | 2841 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,072 psi | 58% | 2848 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,003 psi | 66% | 3018 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 51,590 psi | 81% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,368 psi | 71% | 2933 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 50,212 psi | 79% | 3035 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 47,311 psi | 74% | 3031 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 42,293 psi | 66% | 2848 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,278 psi | 65% | 2831 fps | 97.1% |
| Shooters World Precision | <<locked>> | 80% | 49,835 psi | 78% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,450 psi | 62% | 2805 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,615 psi | 73% | 2992 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,528 psi | 73% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,364 psi | 63% | 2769 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,891 psi | 73% | 3025 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 45,643 psi | 72% | 2936 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 34,635 psi | 54% | 2772 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 42,076 psi | 66% | 2887 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,025 psi | 82% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,127 psi | 82% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,540 psi | 68% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,595 psi | 62% | 2825 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 44,324 psi | 69% | 2923 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 50,589 psi | 79% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,131 psi | 61% | 2825 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 30,371 psi | 48% | 2648 fps | 95% |
| Vihtavuori N560 | <<locked>> | 96% | 52,098 psi | 82% | 3179 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,841 psi | 61% | 2795 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 40,466 psi | 63% | 2881 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,731 psi | 43% | 2651 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,718 psi | 75% | 2999 fps | 95.8% |
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 96 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,317 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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 | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, 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.