Load Specifications
Load data in caliber .308 Norma Mag. with .311 | 180gr | Sellier & Bellot SPRN bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 56,130 psi | 88% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,246 psi | 90% | 2815 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 2861 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 56,652 psi | 89% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,566 psi | 90% | 2910 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,666 psi | 89% | 3005 fps | 97.8% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,479 psi | 90% | 3002 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 86% | 56,391 psi | 88% | 2828 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,752 psi | 86% | 2897 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2949 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,985 psi | 88% | 2953 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,650 psi | 86% | 2890 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,650 psi | 86% | 2890 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,246 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,537 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,447 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,724 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,551 psi | 90% | 2940 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2943 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 2874 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,150 psi | 71% | 2802 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,767 psi | 87% | 3015 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2864 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 54,752 psi | 86% | 2818 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2943 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 57,551 psi | 90% | 2858 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 54,911 psi | 86% | 2831 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,985 psi | 88% | 2907 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 55,666 psi | 87% | 2864 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 56,188 psi | 88% | 2894 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,911 psi | 86% | 2871 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,810 psi | 86% | 2835 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,231 psi | 88% | 2867 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,222 psi | 69% | 2831 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 56,043 psi | 88% | 2940 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,782 psi | 89% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,956 psi | 88% | 2812 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,911 psi | 86% | 2795 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 54,955 psi | 86% | 2838 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,709 psi | 87% | 2831 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 54,288 psi | 85% | 2848 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,405 psi | 87% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,566 psi | 90% | 2877 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,345 psi | 84% | 2917 fps | 96.9% |
| Lovex S060 | <<locked>> | 82% | 57,377 psi | 90% | 2795 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,101 psi | 88% | 2802 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,825 psi | 87% | 2828 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 57,276 psi | 90% | 2871 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,006 psi | 72% | 2710 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 57,421 psi | 90% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,826 psi | 89% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,811 psi | 87% | 2890 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,665 psi | 86% | 2969 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 56,086 psi | 88% | 2894 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,711 psi | 90% | 2884 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,867 psi | 84% | 2936 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 54,752 psi | 86% | 2890 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,066 psi | 75% | 2808 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,911 psi | 86% | 2818 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,259 psi | 87% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,261 psi | 90% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,709 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,164 psi | 69% | 2825 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 54,766 psi | 86% | 2769 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,839 psi | 86% | 2815 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,231 psi | 88% | 2864 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 98% | 57,029 psi | 89% | 2927 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 57,551 psi | 90% | 2858 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,825 psi | 87% | 2828 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,101 psi | 88% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,276 psi | 90% | 2871 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,246 psi | 88% | 2871 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,217 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,608 psi | 87% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,492 psi | 87% | 2782 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,536 psi | 89% | 2923 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 54,737 psi | 86% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,520 psi | 85% | 2805 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 55,463 psi | 87% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,551 psi | 90% | 2900 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 54,998 psi | 86% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,347 psi | 87% | 2743 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,898 psi | 88% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,505 psi | 85% | 2831 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2822 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 56,840 psi | 89% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,334 psi | 90% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,476 psi | 85% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,969 psi | 86% | 2959 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,085 psi | 85% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,985 psi | 88% | 2907 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,050 psi | 74% | 2936 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,464 psi | 90% | 2851 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,056 psi | 85% | 2841 fps | 98% |
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% | 52,736 psi | 83% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,183 psi | 79% | 2703 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,432 psi | 54% | 2474 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 49,966 psi | 78% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,276 psi | 60% | 2575 fps | 98.5% |
| Accurate High Country | 70.7 gr | 92% | 45,730 psi | 72% | 2815 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 98% | 53,664 psi | 84% | 2940 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 46,876 psi | 73% | 2674 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,105 psi | 66% | 2664 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 48,907 psi | 77% | 2825 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,083 psi | 82% | 2890 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,351 psi | 66% | 2667 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,351 psi | 66% | 2667 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,529 psi | 74% | 2703 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,821 psi | 80% | 2769 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,072 psi | 58% | 2579 fps | 98.5% |
| Alliant Reloder-17 | 61.8 gr | 80% | 42,018 psi | 66% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,887 psi | 66% | 2661 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,003 psi | 66% | 2707 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,282 psi | 43% | 2339 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,938 psi | 52% | 2513 fps | 95.6% |
| Alliant Reloder-26 | 65 gr | 82% | 31,227 psi | 49% | 2507 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 41,437 psi | 65% | 2690 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 47,935 psi | 75% | 2713 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,003 psi | 66% | 2707 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,177 psi | 66% | 2589 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,167 psi | 75% | 2723 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,089 psi | 63% | 2618 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,004 psi | 67% | 2638 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 94% | 49,095 psi | 77% | 2776 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,300 psi | 80% | 2812 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,606 psi | 54% | 2474 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,692 psi | 83% | 2815 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,423 psi | 65% | 2769 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,044 psi | 61% | 2628 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 43% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,461 psi | 84% | 2782 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,327 psi | 77% | 2710 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,532 psi | 81% | 2740 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 37,666 psi | 59% | 2510 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,584 psi | 68% | 2618 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,709 psi | 58% | 2526 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 52,156 psi | 82% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,879 psi | 80% | 2772 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 46,775 psi | 73% | 2799 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 54,056 psi | 85% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,748 psi | 78% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,104 psi | 64% | 2569 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 39,276 psi | 62% | 2549 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 33,344 psi | 52% | 2448 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 54,056 psi | 85% | 2766 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,183 psi | 79% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,554 psi | 67% | 2651 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 38,609 psi | 61% | 2661 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 37,884 psi | 59% | 2566 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,473 psi | 79% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,615 psi | 73% | 2805 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,782 psi | 58% | 2552 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 96% | 41,539 psi | 65% | 2684 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 43% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,153 psi | 75% | 2707 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,657 psi | 70% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,956 psi | 59% | 2589 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,753 psi | 58% | 2595 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,334 psi | 60% | 2687 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 51,343 psi | 80% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,092 psi | 71% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,601 psi | 73% | 2700 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 40,944 psi | 64% | 2641 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,177 psi | 66% | 2589 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,104 psi | 64% | 2569 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 49,748 psi | 78% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,276 psi | 62% | 2549 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,296 psi | 73% | 2713 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,722 psi | 84% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,412 psi | 73% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,205 psi | 63% | 2513 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,567 psi | 64% | 2638 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,440 psi | 71% | 2661 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,937 psi | 80% | 2746 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 34,316 psi | 54% | 2523 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,986 psi | 61% | 2572 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 51,880 psi | 81% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,851 psi | 81% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,337 psi | 68% | 2589 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,392 psi | 62% | 2569 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 40,857 psi | 64% | 2602 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 50,082 psi | 78% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,696 psi | 61% | 2566 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,095 psi | 47% | 2415 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 94% | 47,892 psi | 75% | 2835 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,334 psi | 60% | 2533 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,263 psi | 63% | 2621 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,701 psi | 40% | 2365 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,896 psi | 84% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,729 psi | 69% | 2664 fps | 95.8% |
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 96 powders for .308 Norma Mag. loaded with the .311 | 180gr | Sellier & Bellot SPRN. Alliant Reloder-26 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,015 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 180.0 gr projectile in 0.311" calls for a 1:16.5 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-26, Accurate High Country, Alliant Reloder-17 rank at the top here: for .308 Norma Mag. with the .311 | 180gr | Sellier & Bellot SPRN 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.