Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 180gr | Swift Scirocco bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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% | 54,099 psi | 87% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,463 psi | 89% | 2772 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2812 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,534 psi | 87% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,984 psi | 88% | 2861 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2946 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 86% | 54,592 psi | 88% | 2789 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,086 psi | 90% | 2907 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,621 psi | 86% | 2894 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,577 psi | 86% | 2904 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,361 psi | 89% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,651 psi | 89% | 2835 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,738 psi | 89% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,214 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,129 psi | 88% | 2887 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2890 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,385 psi | 79% | 2828 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,207 psi | 69% | 2753 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,750 psi | 85% | 2963 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,051 psi | 77% | 2815 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 56,072 psi | 90% | 2828 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2890 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 55,506 psi | 89% | 2812 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 53,113 psi | 85% | 2792 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 53,722 psi | 86% | 2861 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 53,635 psi | 86% | 2818 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 98% | 53,679 psi | 86% | 2838 fps | 95.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2881 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,941 psi | 90% | 2838 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,114 psi | 87% | 2825 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,577 psi | 86% | 2894 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,100 psi | 88% | 2792 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,012 psi | 87% | 2769 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,214 psi | 85% | 2753 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 53,156 psi | 85% | 2795 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,969 psi | 87% | 2789 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 55,419 psi | 89% | 2854 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,606 psi | 86% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,579 psi | 89% | 2835 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2864 fps | 96.1% |
| Lovex S060 | <<locked>> | 82% | 55,680 psi | 89% | 2756 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,389 psi | 87% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,795 psi | 86% | 2785 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 55,056 psi | 88% | 2825 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,758 psi | 70% | 2661 fps | 98.2% |
| Norma 201 | <<locked>> | 82% | 55,593 psi | 89% | 2776 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,260 psi | 90% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,940 psi | 88% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,505 psi | 86% | 2841 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,651 psi | 89% | 2976 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 53,722 psi | 86% | 2848 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,535 psi | 89% | 2844 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,271 psi | 82% | 2877 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 94% | 56,130 psi | 90% | 2904 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,788 psi | 73% | 2756 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,028 psi | 59% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,084 psi | 85% | 2776 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,953 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,795 psi | 88% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,243 psi | 85% | 2910 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,018 psi | 67% | 2766 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,405 psi | 90% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,217 psi | 90% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,259 psi | 87% | 2822 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,418 psi | 87% | 2877 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 55,506 psi | 89% | 2812 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,795 psi | 86% | 2785 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,389 psi | 87% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,056 psi | 88% | 2825 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,302 psi | 87% | 2831 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,419 psi | 89% | 2808 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,391 psi | 90% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,940 psi | 86% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,417 psi | 86% | 2736 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,925 psi | 86% | 2871 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 56,072 psi | 90% | 2703 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,333 psi | 90% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,840 psi | 90% | 2812 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 52,982 psi | 85% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,158 psi | 88% | 2854 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 53,156 psi | 85% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,388 psi | 86% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,940 psi | 86% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,883 psi | 90% | 2841 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2776 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 55,143 psi | 88% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,940 psi | 88% | 2844 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2907 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2963 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,419 psi | 89% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,722 psi | 86% | 2861 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,773 psi | 72% | 2884 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,463 psi | 89% | 2812 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2851 fps | 98.1% |
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% | 50,647 psi | 81% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,530 psi | 78% | 2661 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 35,085 psi | 56% | 2484 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,979 psi | 77% | 2664 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,579 psi | 59% | 2530 fps | 98% |
| Accurate MAGPRO | <<locked>> | 98% | 50,981 psi | 82% | 2884 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 45,411 psi | 73% | 2638 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,265 psi | 69% | 2677 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 98% | 50,198 psi | 80% | 2835 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,922 psi | 80% | 2848 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,774 psi | 73% | 2661 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,052 psi | 79% | 2730 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,723 psi | 57% | 2539 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,306 psi | 65% | 2661 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,786 psi | 69% | 2667 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,844 psi | 69% | 2717 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,121 psi | 42% | 2293 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,576 psi | 54% | 2523 fps | 95.7% |
| Alliant Reloder-26 | 63.6 gr | 84% | 31,850 psi | 51% | 2520 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 42,250 psi | 68% | 2700 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 46,166 psi | 74% | 2674 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,844 psi | 69% | 2717 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 40,654 psi | 65% | 2546 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 46,528 psi | 75% | 2684 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,406 psi | 62% | 2572 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,466 psi | 66% | 2595 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 50,241 psi | 81% | 2782 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,678 psi | 84% | 2825 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,170 psi | 53% | 2434 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,734 psi | 81% | 2776 fps | 100% |
| Hodgdon Superformance | 64.1 gr | 82% | 40,234 psi | 65% | 2644 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 44% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,721 psi | 83% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,776 psi | 77% | 2671 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,009 psi | 80% | 2700 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 38,841 psi | 62% | 2530 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,134 psi | 68% | 2575 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,143 psi | 56% | 2484 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 50,328 psi | 81% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,081 psi | 79% | 2723 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 47,674 psi | 76% | 2802 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 52,330 psi | 84% | 2707 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,950 psi | 77% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,566 psi | 63% | 2526 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 37,956 psi | 61% | 2510 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 33,910 psi | 54% | 2454 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,199 psi | 84% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,794 psi | 85% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,428 psi | 78% | 2717 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,830 psi | 70% | 2671 fps | 95.4% |
| Norma MRP | <<locked>> | 88% | 36,840 psi | 59% | 2612 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,448 psi | 58% | 2526 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 48,472 psi | 78% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,674 psi | 76% | 2812 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 35,244 psi | 57% | 2510 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 39,595 psi | 63% | 2628 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,485 psi | 75% | 2664 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,844 psi | 69% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,289 psi | 58% | 2546 fps | 97.6% |
| ReloadSwiss RS 70 | 60 gr | 80% | 35,201 psi | 56% | 2546 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,204 psi | 63% | 2697 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 49,763 psi | 80% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,526 psi | 70% | 2621 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,761 psi | 77% | 2710 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 41,713 psi | 67% | 2648 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,654 psi | 65% | 2546 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,566 psi | 63% | 2526 fps | 97.5% |
| Shooters World Precision | <<locked>> | 80% | 47,950 psi | 77% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,956 psi | 61% | 2510 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,498 psi | 71% | 2674 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,924 psi | 83% | 2753 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,098 psi | 85% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,831 psi | 72% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,798 psi | 62% | 2474 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,321 psi | 66% | 2644 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,750 psi | 85% | 2657 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,714 psi | 70% | 2618 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,301 psi | 84% | 2756 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 32,895 psi | 53% | 2484 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,827 psi | 64% | 2582 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 50,024 psi | 80% | 2644 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,328 psi | 81% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,901 psi | 67% | 2552 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,811 psi | 61% | 2526 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 41,698 psi | 67% | 2612 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 48,530 psi | 78% | 2654 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,260 psi | 60% | 2526 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 28,674 psi | 46% | 2372 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 96% | 48,994 psi | 79% | 2844 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,028 psi | 59% | 2497 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,566 psi | 62% | 2575 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,237 psi | 42% | 2379 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,866 psi | 83% | 2759 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,901 psi | 67% | 2618 fps | 95% |
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 102 powders for .300 Win. Mag. loaded with the .308 | 180gr | Swift Scirocco. Norma MRP delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,976 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, 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. 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Win. 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, 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.