Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 150gr | Hornady ECX bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
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 2015 | <<locked>> | 84% | 56,956 psi | 89% | 2972 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,680 psi | 87% | 2992 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,056 psi | 85% | 3015 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,245 psi | 87% | 3002 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,236 psi | 68% | 2877 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 55,869 psi | 88% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,652 psi | 89% | 3143 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 56,463 psi | 88% | 3087 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,479 psi | 90% | 3084 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,216 psi | 87% | 3031 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,521 psi | 89% | 3009 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,550 psi | 89% | 3212 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,215 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,665 psi | 86% | 3074 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,215 psi | 85% | 3146 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,419 psi | 87% | 3182 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,278 psi | 65% | 2910 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,586 psi | 73% | 3087 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,594 psi | 89% | 3100 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 54,897 psi | 86% | 3068 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,882 psi | 86% | 3038 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,840 psi | 89% | 3015 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,940 psi | 86% | 3061 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,101 psi | 89% | 3169 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 55,840 psi | 88% | 3084 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 55,912 psi | 88% | 3140 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 56,318 psi | 88% | 3100 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 57,043 psi | 89% | 3097 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3068 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,826 psi | 89% | 3130 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,724 psi | 89% | 3179 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 56% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,824 psi | 86% | 3045 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,232 psi | 90% | 3077 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,145 psi | 90% | 3071 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,797 psi | 89% | 3045 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 55,390 psi | 87% | 3064 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,768 psi | 89% | 3071 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3130 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 56,086 psi | 88% | 3107 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,216 psi | 87% | 3031 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,434 psi | 88% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,738 psi | 87% | 3009 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,797 psi | 89% | 3061 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,275 psi | 88% | 3064 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 57,232 psi | 90% | 3100 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 54,839 psi | 86% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,738 psi | 87% | 3028 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,638 psi | 90% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,304 psi | 88% | 3117 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 55,463 psi | 87% | 3127 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 54,592 psi | 86% | 3087 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,462 psi | 85% | 3120 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 55,767 psi | 87% | 3051 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,448 psi | 87% | 3071 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,173 psi | 88% | 3031 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 56% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,173 psi | 88% | 3068 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,390 psi | 87% | 3146 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,085 psi | 86% | 3182 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,681 psi | 89% | 3166 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,985 psi | 88% | 3196 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,550 psi | 87% | 3002 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,332 psi | 87% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,752 psi | 86% | 3061 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,882 psi | 86% | 3038 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,275 psi | 88% | 3064 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,434 psi | 88% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,797 psi | 89% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,232 psi | 90% | 3100 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,637 psi | 89% | 3123 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,969 psi | 85% | 3025 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,926 psi | 86% | 3054 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,376 psi | 88% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,971 psi | 89% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,536 psi | 89% | 3015 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 56,637 psi | 89% | 3064 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,724 psi | 87% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,682 psi | 90% | 3077 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,085 psi | 86% | 3061 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3127 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2995 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 55,999 psi | 88% | 2923 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,724 psi | 89% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,477 psi | 87% | 2989 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,246 psi | 88% | 3005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,579 psi | 89% | 3035 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,534 psi | 85% | 3068 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 55,840 psi | 88% | 3031 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,520 psi | 85% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,087 psi | 89% | 3127 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,527 psi | 71% | 2992 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,708 psi | 86% | 3045 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,144 psi | 88% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,912 psi | 88% | 3140 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,970 psi | 58% | 2913 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,810 psi | 86% | 3061 fps | 100% |
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 2015 | <<locked>> | 80% | 50,314 psi | 79% | 2877 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,569 psi | 67% | 2785 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,430 psi | 79% | 2956 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,356 psi | 76% | 2881 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 40,321 psi | 63% | 2815 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 40,321 psi | 63% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,912 psi | 58% | 2766 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 46,543 psi | 73% | 2913 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 39,508 psi | 62% | 2746 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,704 psi | 76% | 2923 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,327 psi | 77% | 2907 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,554 psi | 67% | 2943 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,146 psi | 61% | 2769 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,163 psi | 66% | 2841 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,563 psi | 54% | 2720 fps | 95.1% |
| Alliant Reloder-17 | 60.3 gr | 80% | 33,924 psi | 53% | 2730 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,908 psi | 50% | 2671 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,376 psi | 59% | 2874 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,934 psi | 72% | 2913 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 38,885 psi | 61% | 2772 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 48,356 psi | 76% | 2920 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,256 psi | 79% | 2910 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,732 psi | 75% | 2943 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,301 psi | 84% | 3107 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,668 psi | 62% | 2776 fps | 96.3% |
| Hodgdon H414 | 66.3 gr | 90% | 45,397 psi | 71% | 2946 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 90% | 49,458 psi | 78% | 2979 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 47,021 psi | 74% | 2923 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,676 psi | 50% | 2608 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,105 psi | 68% | 2890 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 90% | 45,426 psi | 71% | 2969 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,121 psi | 71% | 2871 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 46,804 psi | 73% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,481 psi | 65% | 2785 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,903 psi | 69% | 2808 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 45,687 psi | 72% | 2890 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,164 psi | 69% | 2838 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 35,723 psi | 56% | 2720 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,236 psi | 68% | 2874 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 48,704 psi | 76% | 2923 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,774 psi | 72% | 2887 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,296 psi | 73% | 2844 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,292 psi | 65% | 2789 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,944 psi | 64% | 2779 fps | 95.8% |
| Lovex S070 | <<locked>> | 90% | 44,237 psi | 69% | 2867 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,310 psi | 71% | 2858 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 45,788 psi | 72% | 2867 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,510 psi | 65% | 2828 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 52,475 psi | 82% | 3054 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 34,737 psi | 54% | 2707 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 41,278 psi | 65% | 2841 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,597 psi | 65% | 2874 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,747 psi | 76% | 2930 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,312 psi | 76% | 2949 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,417 psi | 82% | 2972 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 42% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,975 psi | 67% | 2822 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,686 psi | 70% | 2953 fps | 98.6% |
| ReloadSwiss RS 60 | 60.3 gr | 80% | 36,201 psi | 57% | 2805 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,709 psi | 58% | 2779 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,276 psi | 62% | 2858 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,182 psi | 77% | 2904 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,076 psi | 68% | 2805 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 36,434 psi | 57% | 2707 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 48,356 psi | 76% | 2920 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,944 psi | 64% | 2779 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,774 psi | 72% | 2887 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,292 psi | 65% | 2789 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 44,237 psi | 69% | 2867 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,623 psi | 59% | 2762 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,050 psi | 74% | 2900 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,947 psi | 70% | 2877 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,615 psi | 73% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,856 psi | 61% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,410 psi | 68% | 2782 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 52,779 psi | 83% | 3005 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,253 psi | 72% | 2808 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,717 psi | 73% | 2894 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 37,260 psi | 58% | 2717 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 27,093 psi | 42% | 2526 fps | 95.1% |
| Somchem S385 | <<locked>> | 98% | 46,499 psi | 73% | 2936 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,576 psi | 82% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,065 psi | 74% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,743 psi | 67% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,366 psi | 68% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,447 psi | 56% | 2648 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 36,201 psi | 57% | 2710 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 48,834 psi | 77% | 2917 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 41,858 psi | 66% | 2782 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,766 psi | 56% | 2710 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 34,650 psi | 54% | 2749 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,430 psi | 49% | 2566 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 48,936 psi | 77% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 45,614 psi | 71% | 2953 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,066 psi | 47% | 2687 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,672 psi | 70% | 2881 fps | 99.4% |
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 97 powders for .308 Norma Mag. loaded with the .308 | 150gr | Hornady ECX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,212 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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-17, ReloadSwiss RS 60, Hodgdon H414 rank at the top here: for .308 Norma Mag. with the .308 | 150gr | Hornady ECX 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.