Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 205gr | Sierra GameKing bullet and 91 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.
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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% | 56,086 psi | 88% | 2621 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 54,636 psi | 86% | 2674 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,767 psi | 87% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,956 psi | 89% | 2713 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 56,086 psi | 88% | 2818 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 98% | 56,985 psi | 89% | 2818 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 84% | 55,332 psi | 87% | 2628 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,537 psi | 90% | 2762 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 98% | 55,114 psi | 86% | 2762 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,942 psi | 59% | 2503 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,508 psi | 90% | 2756 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,463 psi | 88% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,695 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,566 psi | 90% | 2762 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,071 psi | 86% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,724 psi | 89% | 2746 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,462 psi | 85% | 2756 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,100 psi | 86% | 2733 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2684 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,492 psi | 87% | 2822 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2723 fps | 95.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 2740 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 57,421 psi | 90% | 2667 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,584 psi | 68% | 2608 fps | 96.5% |
| Bofors RP5 | <<locked>> | 98% | 54,462 psi | 85% | 2756 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 56,478 psi | 89% | 2661 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,181 psi | 74% | 2625 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 84% | 57,537 psi | 90% | 2687 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,187 psi | 86% | 2713 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 54,621 psi | 86% | 2671 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 96% | 55,158 psi | 86% | 2703 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,172 psi | 85% | 2690 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,375 psi | 85% | 2641 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,731 psi | 73% | 2726 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 55,071 psi | 86% | 2746 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1640 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,969 psi | 86% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,174 psi | 90% | 2648 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 57,653 psi | 90% | 2697 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,520 psi | 85% | 2635 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 57,014 psi | 89% | 2700 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,710 psi | 89% | 2694 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2795 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 55,230 psi | 87% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,882 psi | 86% | 2635 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,391 psi | 88% | 2677 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2589 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,985 psi | 88% | 2661 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,868 psi | 86% | 2700 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 54,157 psi | 85% | 2782 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 55,390 psi | 87% | 2697 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,739 psi | 89% | 2684 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,072 psi | 89% | 2812 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 57,566 psi | 90% | 2749 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,908 psi | 80% | 2694 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,319 psi | 90% | 2674 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,404 psi | 85% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,753 psi | 89% | 2736 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,998 psi | 86% | 2762 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,833 psi | 73% | 2723 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,087 psi | 89% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,580 psi | 90% | 2664 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,419 psi | 87% | 2680 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 56,159 psi | 88% | 2736 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,478 psi | 89% | 2661 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,882 psi | 86% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,230 psi | 87% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,391 psi | 88% | 2677 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,506 psi | 87% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,723 psi | 86% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,418 psi | 85% | 2592 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,695 psi | 87% | 2733 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,232 psi | 90% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,043 psi | 89% | 2674 fps | 97.9% |
| Somchem S365 | <<locked>> | 92% | 55,042 psi | 86% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,884 psi | 89% | 2713 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,595 psi | 90% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,609 psi | 90% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,056 psi | 86% | 2589 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,479 psi | 90% | 2690 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 2690 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,782 psi | 87% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,347 psi | 88% | 2694 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,099 psi | 85% | 2710 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,259 psi | 85% | 2776 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,690 psi | 78% | 2687 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,739 psi | 89% | 2654 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,187 psi | 86% | 2713 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,898 psi | 89% | 2710 fps | 99.2% |
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% | 52,460 psi | 82% | 2569 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 29,979 psi | 47% | 2215 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 52,330 psi | 82% | 2552 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,611 psi | 64% | 2457 fps | 99.6% |
| Accurate High Country | <<locked>> | 88% | 42,395 psi | 66% | 2582 fps | 95.7% |
| Accurate MAGPRO | 68.4 gr | 92% | 46,064 psi | 72% | 2638 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 49,008 psi | 77% | 2533 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,870 psi | 61% | 2438 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 42,192 psi | 66% | 2533 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 33,489 psi | 52% | 2388 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,218 psi | 61% | 2444 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,763 psi | 78% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,229 psi | 83% | 2625 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,131 psi | 61% | 2461 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,628 psi | 70% | 2575 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,827 psi | 61% | 2438 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,579 psi | 57% | 2431 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,834 psi | 45% | 2244 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,732 psi | 45% | 2254 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,995 psi | 49% | 2356 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,201 psi | 85% | 2671 fps | 95% |
| Bofors RP15 | <<locked>> | 90% | 38,696 psi | 61% | 2477 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,502 psi | 79% | 2572 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,770 psi | 64% | 2552 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,579 psi | 57% | 2431 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,063 psi | 69% | 2461 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 41,365 psi | 65% | 2513 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,662 psi | 79% | 2589 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,293 psi | 66% | 2500 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 45,194 psi | 71% | 2516 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 45,063 psi | 71% | 2539 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,237 psi | 69% | 2523 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,709 psi | 58% | 2359 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,158 psi | 57% | 2490 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,104 psi | 64% | 2513 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1463 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,590 psi | 81% | 2562 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,737 psi | 84% | 2598 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 39,740 psi | 62% | 2398 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,498 psi | 71% | 2490 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 38,812 psi | 61% | 2408 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,179 psi | 69% | 2487 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 43,149 psi | 68% | 2566 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,866 psi | 81% | 2559 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,946 psi | 67% | 2441 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,205 psi | 65% | 2428 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 29,399 psi | 46% | 2201 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,591 psi | 82% | 2612 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,233 psi | 61% | 2428 fps | 95.6% |
| Norma MRP | 59.9 gr | 82% | 33,431 psi | 52% | 2385 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 40,001 psi | 63% | 2444 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,055 psi | 83% | 2635 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,902 psi | 67% | 2575 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 38,899 psi | 61% | 2441 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,476 psi | 56% | 2402 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,430 psi | 79% | 2572 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,355 psi | 74% | 2618 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,205 psi | 63% | 2474 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,783 psi | 61% | 2484 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,317 psi | 55% | 2467 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,867 psi | 84% | 2569 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,398 psi | 74% | 2520 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,076 psi | 68% | 2474 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 37,884 psi | 59% | 2418 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,063 psi | 69% | 2461 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,946 psi | 67% | 2441 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,866 psi | 81% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,205 psi | 65% | 2428 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,675 psi | 76% | 2575 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,327 psi | 76% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,119 psi | 66% | 2395 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,536 psi | 59% | 2415 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,529 psi | 74% | 2520 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,961 psi | 69% | 2464 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,767 psi | 58% | 2411 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,881 psi | 53% | 2303 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 54,201 psi | 85% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,114 psi | 85% | 2539 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,397 psi | 71% | 2451 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,568 psi | 65% | 2444 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,607 psi | 56% | 2339 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,460 psi | 82% | 2543 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,915 psi | 64% | 2448 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,213 psi | 50% | 2316 fps | 98.4% |
| Vihtavuori N560 | 65.7 gr | 90% | 44,222 psi | 69% | 2602 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 43,555 psi | 68% | 2579 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,350 psi | 63% | 2411 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,482 psi | 67% | 2503 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,570 psi | 40% | 2238 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,652 psi | 59% | 2388 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 91 powders for .308 Norma Mag. loaded with the .308 | 205gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,822 fps. ADI AR 2225 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 58–90 %, leaving at least 10 % headroom. The 205.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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 .308 Norma Mag. with the .308 | 205gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.