Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Swift Scirocco bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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 2700 | <<locked>> | 82% | 56,637 psi | 89% | 2838 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 55,811 psi | 87% | 2894 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,463 psi | 88% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 53,998 psi | 85% | 2881 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,244 psi | 85% | 2979 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 55,927 psi | 88% | 2848 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,766 psi | 86% | 2930 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 56,202 psi | 88% | 2986 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 2697 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,145 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,261 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,694 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,941 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,273 psi | 85% | 2917 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,651 psi | 87% | 2982 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,805 psi | 76% | 2900 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,884 psi | 89% | 3051 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,578 psi | 86% | 2963 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 54,505 psi | 85% | 2838 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,657 psi | 70% | 2818 fps | 96.1% |
| Bofors RP5 | <<locked>> | 98% | 55,651 psi | 87% | 2982 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 57,145 psi | 90% | 2884 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 2841 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 82% | 54,723 psi | 86% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,956 psi | 88% | 2936 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 55,434 psi | 87% | 2894 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 56,304 psi | 88% | 2927 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,100 psi | 86% | 2907 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,129 psi | 86% | 2861 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,688 psi | 75% | 2943 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 88% | 56,289 psi | 88% | 2972 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1798 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,448 psi | 87% | 2831 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,740 psi | 90% | 2871 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 54,969 psi | 86% | 2864 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,187 psi | 86% | 2854 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 54,404 psi | 85% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,638 psi | 90% | 2913 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3022 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 55,927 psi | 88% | 2828 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,622 psi | 87% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,101 psi | 89% | 2900 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,879 psi | 78% | 2802 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 56,550 psi | 89% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,854 psi | 88% | 2920 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 55,477 psi | 87% | 3009 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 56,173 psi | 88% | 2920 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,551 psi | 90% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,172 psi | 85% | 2976 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 55,056 psi | 86% | 2923 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,330 psi | 82% | 2913 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1841 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,505 psi | 85% | 2841 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,448 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,896 psi | 84% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,028 psi | 88% | 2989 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2940 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 57,682 psi | 90% | 2835 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,839 psi | 86% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,391 psi | 88% | 2900 fps | 98% |
| Rottweil R 905 | <<locked>> | 96% | 57,261 psi | 90% | 2963 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 57,145 psi | 90% | 2884 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,622 psi | 87% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,927 psi | 88% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,101 psi | 89% | 2900 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,159 psi | 88% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,201 psi | 87% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,172 psi | 86% | 2808 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,782 psi | 89% | 2956 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 54,476 psi | 85% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,317 psi | 85% | 2835 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 56,173 psi | 88% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,230 psi | 85% | 2881 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 55,753 psi | 87% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,563 psi | 86% | 2861 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,217 psi | 90% | 2910 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 56,478 psi | 89% | 2805 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,305 psi | 90% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,245 psi | 87% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,492 psi | 87% | 2999 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,923 psi | 80% | 2904 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,143 psi | 85% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,188 psi | 88% | 2940 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,852 psi | 83% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,172 psi | 85% | 2874 fps | 98.5% |
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 2700 | <<locked>> | 80% | 53,113 psi | 83% | 2785 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 32,518 psi | 51% | 2448 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 53,127 psi | 83% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,031 psi | 64% | 2654 fps | 99.3% |
| Accurate MAGPRO | 78.4 gr | 94% | 50,676 psi | 79% | 2917 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 49,574 psi | 78% | 2749 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,192 psi | 66% | 2694 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 92% | 45,847 psi | 72% | 2799 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 98% | 36,463 psi | 57% | 2638 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,415 psi | 79% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,664 psi | 84% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,610 psi | 62% | 2664 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,310 psi | 71% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,378 psi | 62% | 2631 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,827 psi | 62% | 2684 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,312 psi | 46% | 2421 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,140 psi | 49% | 2487 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,415 psi | 49% | 2536 fps | 96.4% |
| Bofors RP15 | <<locked>> | 90% | 39,291 psi | 62% | 2671 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 51,039 psi | 80% | 2785 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,713 psi | 65% | 2756 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 39,827 psi | 62% | 2684 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 44,599 psi | 70% | 2664 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 42,105 psi | 66% | 2713 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 51,256 psi | 80% | 2802 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,931 psi | 67% | 2703 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 45,629 psi | 72% | 2720 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 49,139 psi | 77% | 2805 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,109 psi | 75% | 2789 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,246 psi | 58% | 2552 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,262 psi | 62% | 2746 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 41,959 psi | 66% | 2720 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1604 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,127 psi | 82% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,172 psi | 85% | 2815 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 40,132 psi | 63% | 2595 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,948 psi | 72% | 2694 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 39,291 psi | 62% | 2605 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,732 psi | 75% | 2746 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 44,034 psi | 69% | 2772 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 52,417 psi | 82% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,555 psi | 68% | 2648 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 41,843 psi | 66% | 2631 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 31,821 psi | 50% | 2428 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 53,026 psi | 83% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,525 psi | 67% | 2680 fps | 95.8% |
| Norma MRP | 68.7 gr | 84% | 36,274 psi | 57% | 2631 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 40,683 psi | 64% | 2648 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 53,722 psi | 84% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,845 psi | 69% | 2782 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 39,450 psi | 62% | 2638 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 38,870 psi | 61% | 2654 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 44% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,126 psi | 80% | 2789 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,066 psi | 75% | 2835 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,843 psi | 64% | 2674 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,349 psi | 62% | 2684 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,114 psi | 57% | 2661 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 54,317 psi | 85% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,167 psi | 75% | 2736 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,714 psi | 69% | 2674 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 38,537 psi | 60% | 2615 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 44,599 psi | 70% | 2664 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,555 psi | 68% | 2648 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 52,417 psi | 82% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,843 psi | 66% | 2631 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,313 psi | 77% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,776 psi | 76% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,627 psi | 67% | 2592 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,727 psi | 64% | 2667 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 48,211 psi | 76% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,630 psi | 75% | 2720 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 37,246 psi | 58% | 2605 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,622 psi | 57% | 2543 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 46,137 psi | 72% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,945 psi | 66% | 2641 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 38,551 psi | 60% | 2579 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 53,040 psi | 83% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,437 psi | 65% | 2644 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 32,648 psi | 51% | 2500 fps | 97.9% |
| Vihtavuori N560 | 75.3 gr | 92% | 48,283 psi | 76% | 2871 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 96% | 44,483 psi | 70% | 2782 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,988 psi | 64% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,931 psi | 67% | 2703 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,947 psi | 41% | 2405 fps | 97.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,133 psi | 64% | 2641 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 91 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Swift Scirocco. Alliant Reloder-26 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,051 fps. ADI AR 2217 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, Norma 217, ReloadSwiss RS 80 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.