Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 155.5gr | Warner Tool Co. Flat Line 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 Winchester 760.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 57,261 psi | 90% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,304 psi | 88% | 2933 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,041 psi | 85% | 2946 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,071 psi | 86% | 2930 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,381 psi | 68% | 2818 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 56,217 psi | 88% | 2979 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,405 psi | 88% | 3071 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 56,289 psi | 88% | 3012 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,450 psi | 90% | 3012 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,100 psi | 86% | 2959 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,347 psi | 88% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,260 psi | 88% | 3140 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,624 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,636 psi | 86% | 3005 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3127 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,998 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,191 psi | 65% | 2848 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,354 psi | 73% | 3022 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,304 psi | 88% | 3028 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 54,752 psi | 86% | 2999 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,737 psi | 86% | 2966 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,855 psi | 89% | 2943 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,824 psi | 86% | 2992 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,739 psi | 89% | 3094 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 55,666 psi | 87% | 3012 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 55,274 psi | 87% | 3061 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 55,970 psi | 88% | 3025 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 56,855 psi | 89% | 3025 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,519 psi | 84% | 2995 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,724 psi | 89% | 3061 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,173 psi | 88% | 3104 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 56% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,549 psi | 85% | 2972 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,985 psi | 89% | 3002 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,724 psi | 89% | 2995 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,782 psi | 89% | 2976 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 54,984 psi | 86% | 2992 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,550 psi | 89% | 2999 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3058 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 56,043 psi | 88% | 3038 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,100 psi | 86% | 2959 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,362 psi | 88% | 2989 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,622 psi | 87% | 2936 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,826 psi | 89% | 2992 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,028 psi | 88% | 2992 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 57,203 psi | 90% | 3031 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 54,926 psi | 86% | 2953 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,709 psi | 87% | 2959 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,217 psi | 90% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,840 psi | 88% | 3045 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 55,245 psi | 87% | 3054 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 54,375 psi | 85% | 3015 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,056 psi | 85% | 3051 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 55,419 psi | 87% | 2979 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,274 psi | 87% | 2999 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,101 psi | 88% | 2963 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 56% | 1890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,811 psi | 87% | 2992 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,056 psi | 86% | 3071 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,781 psi | 86% | 3110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,072 psi | 88% | 3091 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,593 psi | 87% | 3123 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,985 psi | 88% | 2940 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,506 psi | 87% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,549 psi | 85% | 2989 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,737 psi | 86% | 2966 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,028 psi | 88% | 2992 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,362 psi | 88% | 2989 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,826 psi | 89% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,203 psi | 90% | 3031 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,521 psi | 89% | 3054 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,954 psi | 85% | 2956 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,665 psi | 86% | 2982 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,362 psi | 88% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,782 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,420 psi | 88% | 2946 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 56,405 psi | 88% | 2992 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,753 psi | 87% | 2887 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,450 psi | 90% | 3005 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,781 psi | 86% | 2986 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 3058 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,472 psi | 78% | 2930 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 55,927 psi | 88% | 2851 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,637 psi | 89% | 2877 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,376 psi | 87% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,115 psi | 88% | 2933 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,420 psi | 88% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,012 psi | 85% | 2995 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 55,782 psi | 87% | 2963 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,389 psi | 85% | 2930 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,884 psi | 89% | 3058 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,397 psi | 71% | 2930 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,244 psi | 85% | 2972 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,796 psi | 87% | 3009 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,535 psi | 87% | 3068 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,941 psi | 58% | 2854 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,723 psi | 86% | 2989 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% | 50,386 psi | 79% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,250 psi | 68% | 2733 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,575 psi | 79% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,196 psi | 76% | 2812 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 40,422 psi | 63% | 2759 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,886 psi | 64% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,577 psi | 54% | 2648 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 46,572 psi | 73% | 2844 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,581 psi | 62% | 2687 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,631 psi | 76% | 2854 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,269 psi | 77% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,627 psi | 67% | 2881 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,378 psi | 62% | 2710 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,221 psi | 66% | 2776 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,592 psi | 54% | 2661 fps | 95.3% |
| Alliant Reloder-17 | 57.3 gr | 80% | 34,142 psi | 54% | 2677 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,139 psi | 47% | 2559 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,420 psi | 59% | 2815 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,035 psi | 72% | 2851 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 39,160 psi | 61% | 2717 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 48,298 psi | 76% | 2854 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,314 psi | 79% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,863 psi | 75% | 2881 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,837 psi | 83% | 3031 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,958 psi | 63% | 2720 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 90% | 45,252 psi | 71% | 2881 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 49,124 psi | 77% | 2907 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,992 psi | 74% | 2858 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,994 psi | 47% | 2503 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,076 psi | 68% | 2828 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 90% | 45,121 psi | 71% | 2900 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 42% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,020 psi | 71% | 2805 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,992 psi | 74% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,582 psi | 65% | 2726 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,932 psi | 69% | 2743 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 45,745 psi | 72% | 2828 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,222 psi | 69% | 2776 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 35,824 psi | 56% | 2664 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 43,265 psi | 68% | 2808 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 48,631 psi | 76% | 2854 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,079 psi | 72% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,296 psi | 73% | 2779 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,553 psi | 65% | 2726 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,740 psi | 61% | 2667 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 44,527 psi | 70% | 2808 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,585 psi | 71% | 2795 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,948 psi | 72% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,640 psi | 65% | 2766 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 52,228 psi | 82% | 2982 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,824 psi | 55% | 2651 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,394 psi | 65% | 2782 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 41,408 psi | 65% | 2808 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,689 psi | 76% | 2861 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,399 psi | 76% | 2884 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,489 psi | 82% | 2907 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,975 psi | 67% | 2759 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,802 psi | 70% | 2890 fps | 98.7% |
| ReloadSwiss RS 60 | 57.3 gr | 80% | 36,318 psi | 57% | 2749 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,840 psi | 58% | 2726 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,378 psi | 62% | 2795 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 49,661 psi | 78% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,540 psi | 68% | 2749 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,811 psi | 58% | 2657 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 48,298 psi | 76% | 2854 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,740 psi | 61% | 2667 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,079 psi | 72% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,553 psi | 65% | 2726 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 44,527 psi | 70% | 2808 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,826 psi | 59% | 2710 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,108 psi | 74% | 2838 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,107 psi | 71% | 2815 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,717 psi | 73% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,044 psi | 61% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,424 psi | 68% | 2720 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 52,910 psi | 83% | 2940 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,441 psi | 73% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,862 psi | 73% | 2831 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 37,579 psi | 59% | 2664 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 27,398 psi | 43% | 2480 fps | 95.6% |
| Somchem S385 | <<locked>> | 98% | 46,267 psi | 73% | 2871 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,620 psi | 82% | 2805 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,108 psi | 74% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,975 psi | 67% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,540 psi | 68% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,766 psi | 56% | 2598 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 36,332 psi | 57% | 2654 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 48,834 psi | 77% | 2851 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 42,047 psi | 66% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,897 psi | 56% | 2654 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 90% | 32,532 psi | 51% | 2641 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,749 psi | 50% | 2516 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 48,849 psi | 77% | 2900 fps | 100% |
| Winchester 760 | 63.1 gr | 90% | 45,484 psi | 71% | 2887 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,414 psi | 48% | 2648 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,744 psi | 70% | 2818 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 | 155.5gr | Warner Tool Co. Flat Line. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,140 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 155.5 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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, Winchester 760 rank at the top here: for .308 Norma Mag. with the .308 | 155.5gr | Warner Tool Co. Flat Line 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.