Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Swift Scirocco 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 Alliant Reloder-26.
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% | 57,711 psi | 90% | 3048 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,317 psi | 87% | 3054 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3091 fps | 99% |
| Accurate 4064 | <<locked>> | 84% | 54,491 psi | 85% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,303 psi | 87% | 3156 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 56,797 psi | 89% | 3130 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,534 psi | 85% | 3081 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,318 psi | 88% | 3192 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,638 psi | 90% | 3271 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,448 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,666 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,912 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,377 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,695 psi | 87% | 3179 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,924 psi | 83% | 3173 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3110 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,381 psi | 68% | 3012 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,403 psi | 84% | 3251 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,971 psi | 89% | 3150 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 56,391 psi | 88% | 3127 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,924 psi | 83% | 3173 fps | 97% |
| Bofors RP7 | <<locked>> | 90% | 55,709 psi | 87% | 3100 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 56,666 psi | 89% | 3136 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 57,479 psi | 90% | 3209 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 57,116 psi | 90% | 3163 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 57,421 psi | 90% | 3140 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,304 psi | 88% | 3136 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,201 psi | 85% | 3123 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,012 psi | 85% | 3179 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 57% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,926 psi | 86% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,421 psi | 90% | 3117 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,681 psi | 89% | 3097 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 56,695 psi | 89% | 3133 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,377 psi | 90% | 3130 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 55,637 psi | 87% | 3143 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 57,116 psi | 90% | 3159 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 57,493 psi | 90% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,550 psi | 87% | 3051 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,230 psi | 85% | 3058 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,493 psi | 90% | 3130 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 55,347 psi | 87% | 3114 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,135 psi | 69% | 2923 fps | 97.3% |
| Norma 201 | <<locked>> | 82% | 55,579 psi | 87% | 3071 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,362 psi | 88% | 3071 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,969 psi | 86% | 3114 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,682 psi | 90% | 3189 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3268 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 57,624 psi | 90% | 3196 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,666 psi | 87% | 3136 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,449 psi | 88% | 3192 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,869 psi | 58% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,652 psi | 89% | 3120 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,536 psi | 89% | 3199 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,811 psi | 89% | 3235 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,245 psi | 87% | 3176 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,682 psi | 90% | 3268 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,188 psi | 88% | 3071 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,246 psi | 88% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,418 psi | 85% | 3100 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 98% | 54,665 psi | 86% | 3159 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,709 psi | 87% | 3100 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,493 psi | 90% | 3130 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,493 psi | 90% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,230 psi | 85% | 3058 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,347 psi | 87% | 3114 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,404 psi | 85% | 3123 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,317 psi | 87% | 3100 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,318 psi | 88% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,261 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,217 psi | 90% | 3074 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,186 psi | 85% | 3153 fps | 97.2% |
| Somchem S335 | <<locked>> | 82% | 56,086 psi | 88% | 2999 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,318 psi | 88% | 3114 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,884 psi | 89% | 3199 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,477 psi | 87% | 3136 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,782 psi | 89% | 2982 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,608 psi | 89% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,826 psi | 89% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,012 psi | 85% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,159 psi | 88% | 3133 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,271 psi | 80% | 3048 fps | 97% |
| Vihtavuori N540 | <<locked>> | 84% | 55,245 psi | 87% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,259 psi | 87% | 3136 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 3196 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,999 psi | 88% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,696 psi | 90% | 3212 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,063 psi | 71% | 3159 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,637 psi | 87% | 3110 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3130 fps | 97.3% |
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% | 50,633 psi | 79% | 2943 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,443 psi | 76% | 2930 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 37,753 psi | 59% | 2785 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 47,950 psi | 75% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,390 psi | 57% | 2776 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 53,330 psi | 84% | 3074 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,310 psi | 71% | 2910 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 49,414 psi | 77% | 3064 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,096 psi | 79% | 3140 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,832 psi | 72% | 2940 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,878 psi | 77% | 3012 fps | 99.7% |
| Alliant Reloder-16 | 63.3 gr | 80% | 35,549 psi | 56% | 2785 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,335 psi | 63% | 2927 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,834 psi | 77% | 3051 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,209 psi | 72% | 3041 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,660 psi | 46% | 2631 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,868 psi | 56% | 2818 fps | 95.1% |
| Alliant Reloder-26 | 75.1 gr | 86% | 34,301 psi | 54% | 2822 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,359 psi | 84% | 3091 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 46,035 psi | 72% | 2946 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 46,209 psi | 72% | 3041 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 43,250 psi | 68% | 2861 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 46,412 psi | 73% | 2953 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 41,147 psi | 64% | 2890 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 84% | 47,137 psi | 74% | 2979 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 53,911 psi | 84% | 3084 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 52% | 2677 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,662 psi | 79% | 3061 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 43,308 psi | 68% | 2966 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,605 psi | 81% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,659 psi | 75% | 2949 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,038 psi | 78% | 2979 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 44,005 psi | 69% | 2897 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,945 psi | 66% | 2835 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 35,056 psi | 55% | 2726 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 50,096 psi | 79% | 3041 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,751 psi | 84% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,431 psi | 82% | 2999 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,993 psi | 75% | 2953 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,552 psi | 62% | 2782 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 40,248 psi | 63% | 2815 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 38,725 psi | 61% | 2808 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 52,156 psi | 82% | 3018 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,895 psi | 83% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,254 psi | 76% | 2995 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 47,050 psi | 74% | 2995 fps | 95% |
| Norma MRP | <<locked>> | 92% | 42,409 psi | 66% | 2992 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 36,245 psi | 57% | 2769 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 48,689 psi | 76% | 3018 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 37,652 psi | 59% | 2815 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,485 psi | 43% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,470 psi | 73% | 2936 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,721 psi | 83% | 3136 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,844 psi | 67% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,143 psi | 57% | 2789 fps | 96.2% |
| ReloadSwiss RS 70 | 69.3 gr | 80% | 35,346 psi | 55% | 2792 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 49,734 psi | 78% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,308 psi | 68% | 2887 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 94% | 51,010 psi | 80% | 3038 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 47,877 psi | 75% | 3035 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 43,250 psi | 68% | 2861 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,552 psi | 62% | 2782 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,751 psi | 84% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,993 psi | 75% | 2953 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,248 psi | 63% | 2815 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,411 psi | 70% | 2943 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,822 psi | 81% | 3041 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,997 psi | 83% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,744 psi | 70% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,379 psi | 65% | 2779 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,442 psi | 74% | 3028 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,750 psi | 83% | 2946 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,671 psi | 68% | 2887 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 32,764 psi | 51% | 2723 fps | 98.6% |
| Somchem S385 | <<locked>> | 90% | 42,554 psi | 67% | 2890 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 53,505 psi | 84% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,879 psi | 78% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,067 psi | 78% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,713 psi | 65% | 2815 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,652 psi | 59% | 2772 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 44,759 psi | 70% | 2923 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,414 psi | 76% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,130 psi | 58% | 2772 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 32,663 psi | 51% | 2713 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,014 psi | 58% | 2743 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 41,336 psi | 65% | 2894 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,079 psi | 44% | 2657 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,011 psi | 82% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,399 psi | 76% | 3002 fps | 95.6% |
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 107 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Swift Scirocco. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,271 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 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 1:12.0 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, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Bofors RP30 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.