Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 180gr | Sierra Pro-Hunter 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 Accurate High Country.
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% | 55,999 psi | 88% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,159 psi | 90% | 2815 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 2858 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,594 psi | 89% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,464 psi | 90% | 2907 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,347 psi | 88% | 2999 fps | 97.8% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3002 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 86% | 56,318 psi | 88% | 2825 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,679 psi | 86% | 2897 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 2946 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,883 psi | 88% | 2949 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,392 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,435 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,346 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,622 psi | 87% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,479 psi | 90% | 2936 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2943 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2874 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,092 psi | 71% | 2802 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,666 psi | 87% | 3012 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2864 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 54,636 psi | 86% | 2815 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2943 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 57,450 psi | 90% | 2854 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,042 psi | 86% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,898 psi | 88% | 2907 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 55,564 psi | 87% | 2864 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 56,101 psi | 88% | 2890 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,853 psi | 86% | 2871 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,723 psi | 86% | 2831 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,130 psi | 88% | 2864 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,179 psi | 69% | 2831 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 90% | 55,970 psi | 88% | 2940 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,506 psi | 57% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,666 psi | 89% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,840 psi | 88% | 2808 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,810 psi | 86% | 2792 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 54,882 psi | 86% | 2835 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,622 psi | 87% | 2828 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 57,667 psi | 90% | 2897 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,303 psi | 87% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,493 psi | 90% | 2877 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,287 psi | 84% | 2917 fps | 96.9% |
| Lovex S060 | <<locked>> | 82% | 57,276 psi | 90% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,028 psi | 88% | 2802 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,738 psi | 87% | 2828 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,203 psi | 90% | 2871 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,934 psi | 72% | 2710 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 57,305 psi | 90% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,724 psi | 89% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,724 psi | 87% | 2887 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,331 psi | 85% | 2966 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 55,999 psi | 88% | 2890 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,624 psi | 90% | 2884 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,548 psi | 84% | 2933 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 54,679 psi | 86% | 2890 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,993 psi | 75% | 2808 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,824 psi | 86% | 2818 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,187 psi | 86% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,174 psi | 90% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,637 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,121 psi | 69% | 2825 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 54,708 psi | 86% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,723 psi | 86% | 2812 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,144 psi | 88% | 2864 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 98% | 56,884 psi | 89% | 2927 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 57,450 psi | 90% | 2854 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,738 psi | 87% | 2828 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,028 psi | 88% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,203 psi | 90% | 2871 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,159 psi | 88% | 2871 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,145 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,492 psi | 87% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,405 psi | 87% | 2782 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,391 psi | 88% | 2920 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 57,682 psi | 90% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,665 psi | 86% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,433 psi | 85% | 2805 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 55,361 psi | 87% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,493 psi | 90% | 2900 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 55,114 psi | 86% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,230 psi | 87% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,072 psi | 88% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,404 psi | 85% | 2831 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2822 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 57,000 psi | 89% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,261 psi | 90% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,389 psi | 85% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,650 psi | 86% | 2956 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,682 psi | 90% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,898 psi | 88% | 2907 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2936 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,377 psi | 90% | 2851 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,998 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% | 52,605 psi | 82% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,096 psi | 79% | 2700 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 34,374 psi | 54% | 2470 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 49,835 psi | 78% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,174 psi | 60% | 2572 fps | 98.4% |
| Accurate High Country | 70.6 gr | 92% | 45,658 psi | 72% | 2812 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 98% | 53,606 psi | 84% | 2940 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 46,804 psi | 73% | 2674 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,018 psi | 66% | 2661 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 48,849 psi | 77% | 2825 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,967 psi | 81% | 2890 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,471 psi | 74% | 2700 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,720 psi | 79% | 2769 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,985 psi | 58% | 2579 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,930 psi | 66% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,814 psi | 66% | 2657 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,930 psi | 66% | 2703 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,238 psi | 43% | 2336 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,880 psi | 52% | 2510 fps | 95.5% |
| Alliant Reloder-26 | 64.9 gr | 82% | 31,154 psi | 49% | 2507 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 41,365 psi | 65% | 2690 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 47,819 psi | 75% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,930 psi | 66% | 2703 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,090 psi | 66% | 2585 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,066 psi | 75% | 2720 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,001 psi | 63% | 2615 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 42,902 psi | 67% | 2638 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 94% | 49,023 psi | 77% | 2772 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,242 psi | 80% | 2812 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,519 psi | 54% | 2470 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,591 psi | 82% | 2815 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,365 psi | 65% | 2766 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 38,972 psi | 61% | 2625 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,359 psi | 84% | 2779 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,240 psi | 77% | 2707 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,430 psi | 81% | 2736 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 37,623 psi | 59% | 2510 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,497 psi | 68% | 2618 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,637 psi | 57% | 2523 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 52,040 psi | 82% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,807 psi | 80% | 2769 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 46,499 psi | 73% | 2792 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 53,998 psi | 85% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,661 psi | 78% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,002 psi | 64% | 2566 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 39,175 psi | 61% | 2546 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 33,286 psi | 52% | 2444 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 53,954 psi | 85% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,082 psi | 78% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,467 psi | 67% | 2651 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 38,537 psi | 60% | 2661 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,811 psi | 59% | 2566 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,401 psi | 79% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,557 psi | 73% | 2805 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,695 psi | 57% | 2552 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 41,495 psi | 65% | 2684 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,051 psi | 75% | 2707 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,556 psi | 70% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,855 psi | 59% | 2589 fps | 98.1% |
| ReloadSwiss RS 70 | 62.7 gr | 80% | 36,680 psi | 57% | 2592 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,247 psi | 60% | 2687 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 51,488 psi | 81% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,034 psi | 71% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,514 psi | 73% | 2700 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 40,872 psi | 64% | 2641 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,090 psi | 66% | 2585 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,002 psi | 64% | 2566 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 49,661 psi | 78% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,175 psi | 61% | 2546 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,224 psi | 72% | 2710 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,621 psi | 84% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,325 psi | 73% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,103 psi | 63% | 2510 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,509 psi | 63% | 2635 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 54,447 psi | 85% | 2694 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,368 psi | 71% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,879 psi | 80% | 2746 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 34,258 psi | 54% | 2520 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,899 psi | 61% | 2569 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 51,808 psi | 81% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,793 psi | 81% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,236 psi | 68% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,291 psi | 62% | 2566 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 40,785 psi | 64% | 2602 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,980 psi | 78% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,653 psi | 61% | 2566 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,994 psi | 47% | 2411 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 94% | 47,819 psi | 75% | 2835 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,261 psi | 60% | 2533 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,176 psi | 63% | 2621 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,643 psi | 40% | 2365 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,795 psi | 84% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,627 psi | 68% | 2661 fps | 95.7% |
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 95 powders for .308 Norma Mag. loaded with the .308 | 180gr | Sierra Pro-Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,012 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 0.308" calls for a 1:16.0 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, Accurate High Country rank at the top here: for .308 Norma Mag. with the .308 | 180gr | Sierra Pro-Hunter 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.