Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 180gr | Swift Scirocco bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 54,505 psi | 85% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,492 psi | 87% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,014 psi | 89% | 3071 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 56,260 psi | 88% | 3005 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 54,172 psi | 85% | 3009 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 2969 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,775 psi | 73% | 2930 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,478 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,508 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,912 psi | 88% | 2995 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,360 psi | 85% | 3005 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,622 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,259 psi | 87% | 3041 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,217 psi | 88% | 3068 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,579 psi | 87% | 2966 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 57,188 psi | 90% | 3051 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 3041 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 54,360 psi | 85% | 3005 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 57,435 psi | 90% | 2946 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3058 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 57,087 psi | 89% | 3002 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,869 psi | 88% | 2956 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,667 psi | 90% | 3005 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,579 psi | 89% | 2989 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,608 psi | 89% | 2923 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,983 psi | 85% | 3114 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 53,722 psi | 84% | 2976 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,666 psi | 87% | 2933 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,317 psi | 87% | 2913 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,796 psi | 87% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,897 psi | 86% | 2930 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 55,941 psi | 88% | 3048 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,221 psi | 66% | 2825 fps | 96.2% |
| Lovex S065 | <<locked>> | 84% | 56,014 psi | 88% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,447 psi | 85% | 2910 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,724 psi | 87% | 2936 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,797 psi | 89% | 2992 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 42,482 psi | 67% | 2851 fps | 98.5% |
| Norma MRP | <<locked>> | 90% | 54,172 psi | 85% | 3025 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 57,566 psi | 90% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,826 psi | 89% | 3071 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 56,405 psi | 88% | 2989 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,245 psi | 87% | 3002 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,637 psi | 87% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,882 psi | 84% | 2995 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,694 psi | 86% | 3107 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 3061 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 90% | 57,305 psi | 90% | 2976 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 55,303 psi | 87% | 2982 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 57,435 psi | 90% | 2946 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,014 psi | 88% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,447 psi | 85% | 2910 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,288 psi | 87% | 2867 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,882 psi | 86% | 2979 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 55,288 psi | 87% | 2910 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 54,520 psi | 85% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,999 psi | 88% | 2956 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 56,188 psi | 88% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,535 psi | 87% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,506 psi | 87% | 2936 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 54,853 psi | 86% | 2927 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,418 psi | 85% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 53,911 psi | 84% | 3018 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 96% | 54,114 psi | 85% | 3002 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,737 psi | 86% | 3061 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,969 psi | 86% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,290 psi | 90% | 3005 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,925 psi | 85% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,767 psi | 87% | 2949 fps | 99.4% |
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 3100 | <<locked>> | 80% | 36,376 psi | 57% | 2575 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 48,515 psi | 76% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,137 psi | 72% | 2874 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 40,321 psi | 63% | 2703 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 41,162 psi | 65% | 2753 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 39,856 psi | 62% | 2717 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 33,620 psi | 53% | 2612 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,398 psi | 73% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,621 psi | 84% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,379 psi | 63% | 2700 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,260 psi | 57% | 2638 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,940 psi | 55% | 2598 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,327 psi | 48% | 2503 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,493 psi | 60% | 2746 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,257 psi | 82% | 2907 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 38,566 psi | 60% | 2690 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 39,073 psi | 61% | 2733 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 36,260 psi | 57% | 2638 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 50,618 psi | 79% | 2835 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,014 psi | 60% | 2677 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,024 psi | 78% | 2884 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,431 psi | 82% | 2900 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,961 psi | 69% | 2759 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,149 psi | 68% | 2743 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,700 psi | 68% | 2717 fps | 100% |
| Hodgdon Retumbo | 78.6 gr | 86% | 36,042 psi | 56% | 2710 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 49,922 psi | 78% | 2910 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 44% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,137 psi | 72% | 2766 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,996 psi | 81% | 2858 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,963 psi | 72% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,699 psi | 67% | 2700 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 42,554 psi | 67% | 2792 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,479 psi | 62% | 2759 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,603 psi | 78% | 2805 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,022 psi | 75% | 2799 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 31,299 psi | 49% | 2448 fps | 96% |
| Norma 204 | <<locked>> | 80% | 46,238 psi | 72% | 2802 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,606 psi | 54% | 2664 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 37,956 psi | 59% | 2703 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 47,355 psi | 74% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,494 psi | 62% | 2736 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 46,108 psi | 72% | 2812 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 35,201 psi | 55% | 2608 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 45% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,356 psi | 76% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,572 psi | 73% | 2871 fps | 100% |
| ReloadSwiss RS 76 | 82.2 gr | 84% | 32,895 psi | 52% | 2618 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,122 psi | 72% | 2913 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 41,524 psi | 65% | 2680 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 39,682 psi | 62% | 2684 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,618 psi | 79% | 2835 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,603 psi | 78% | 2805 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,022 psi | 75% | 2799 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,501 psi | 76% | 2756 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,392 psi | 62% | 2677 fps | 96.3% |
| Somchem S361 | <<locked>> | 80% | 42,322 psi | 66% | 2671 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 44,585 psi | 70% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,350 psi | 63% | 2667 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 52,721 psi | 83% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,820 psi | 77% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,983 psi | 55% | 2536 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 48,008 psi | 75% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,088 psi | 61% | 2677 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,787 psi | 69% | 2825 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 41,162 psi | 65% | 2753 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 47,427 psi | 74% | 2927 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,892 psi | 75% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,024 psi | 78% | 2884 fps | 99.6% |
| Winchester StaBALL HD | 75.1 gr | 80% | 31,082 psi | 49% | 2618 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,796 psi | 58% | 2589 fps | 95.3% |
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 75 powders for .300 Norma Mag. loaded with the .308 | 180gr | Swift Scirocco. Hodgdon Retumbo delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,114 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, 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-33 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Norma 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, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.