Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 150gr | Barnes TSX FN FB bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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 2015 | <<locked>> | 82% | 54,969 psi | 86% | 2953 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,435 psi | 90% | 3022 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,680 psi | 87% | 3045 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,521 psi | 89% | 3031 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,063 psi | 71% | 2920 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 57,551 psi | 90% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,592 psi | 86% | 3114 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 54,360 psi | 85% | 3061 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 55,434 psi | 87% | 3061 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,768 psi | 89% | 3061 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,230 psi | 85% | 2979 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,433 psi | 85% | 3182 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,085 psi | 86% | 3071 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,709 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,173 psi | 88% | 3107 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,796 psi | 87% | 3182 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 57,261 psi | 90% | 3215 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,743 psi | 67% | 2949 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,515 psi | 76% | 3133 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,317 psi | 85% | 3074 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 56,420 psi | 88% | 3097 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,420 psi | 88% | 3074 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,737 psi | 86% | 2992 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,405 psi | 88% | 3091 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,232 psi | 90% | 3114 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 57,696 psi | 90% | 3176 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 92% | 54,172 psi | 85% | 3074 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 84% | 54,926 psi | 86% | 3071 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,927 psi | 88% | 3100 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,839 psi | 86% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,346 psi | 85% | 3146 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 56% | 1916 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,057 psi | 88% | 3074 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,129 psi | 86% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,882 psi | 86% | 3045 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,708 psi | 86% | 3022 fps | 97.8% |
| IMR 4350 | <<locked>> | 98% | 57,043 psi | 89% | 3100 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,621 psi | 86% | 3045 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 55,158 psi | 86% | 3107 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 57,638 psi | 90% | 3140 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,768 psi | 89% | 3061 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,027 psi | 85% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,971 psi | 89% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,621 psi | 86% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,143 psi | 85% | 3038 fps | 98.8% |
| Lovex S070 | <<locked>> | 96% | 55,201 psi | 87% | 3077 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 56,420 psi | 88% | 3054 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,101 psi | 89% | 3054 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,361 psi | 87% | 3091 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,085 psi | 85% | 3091 fps | 95.9% |
| Norma MRPᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3087 fps | 96.4% |
| Norma URP | <<locked>> | 98% | 57,363 psi | 90% | 3159 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 56,217 psi | 88% | 3117 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,130 psi | 88% | 3156 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 57,014 psi | 89% | 3081 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,898 psi | 89% | 3100 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,566 psi | 90% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,042 psi | 56% | 1959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,682 psi | 90% | 3097 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,058 psi | 89% | 3182 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,000 psi | 89% | 3215 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,592 psi | 86% | 3140 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,737 psi | 84% | 3166 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 57,014 psi | 89% | 3035 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,927 psi | 89% | 3054 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,275 psi | 88% | 3091 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 56,420 psi | 88% | 3074 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,143 psi | 85% | 3038 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,027 psi | 85% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,621 psi | 86% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,201 psi | 87% | 3077 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,520 psi | 85% | 3097 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,579 psi | 87% | 3058 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,333 psi | 88% | 3084 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,725 psi | 90% | 2989 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,911 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,389 psi | 85% | 2989 fps | 97.7% |
| Somchem S335 | <<locked>> | 86% | 57,217 psi | 90% | 2986 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,317 psi | 87% | 3048 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 56,536 psi | 89% | 3091 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3163 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 3035 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 82% | 57,246 psi | 90% | 2946 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 54,650 psi | 86% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,971 psi | 89% | 3015 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,099 psi | 85% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,404 psi | 85% | 3012 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,086 psi | 88% | 3100 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 57,116 psi | 90% | 3061 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,854 psi | 88% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,027 psi | 86% | 3104 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,326 psi | 74% | 3031 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,391 psi | 88% | 3074 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,740 psi | 90% | 3114 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,696 psi | 90% | 3176 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,276 psi | 60% | 2959 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,449 psi | 88% | 3091 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% | 51,387 psi | 81% | 2900 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,859 psi | 69% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,837 psi | 81% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,253 psi | 72% | 2851 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 41,930 psi | 66% | 2854 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 41,524 psi | 65% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,621 psi | 56% | 2736 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,659 psi | 75% | 2940 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,524 psi | 64% | 2779 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,821 psi | 78% | 2949 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,778 psi | 80% | 2930 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,932 psi | 69% | 2982 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,283 psi | 76% | 2956 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,205 psi | 63% | 2799 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,250 psi | 68% | 2871 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,433 psi | 56% | 2753 fps | 95.7% |
| Alliant Reloder-17 | 61.9 gr | 80% | 34,969 psi | 55% | 2766 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,763 psi | 48% | 2641 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,955 psi | 56% | 2841 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,268 psi | 74% | 2946 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 39,943 psi | 63% | 2799 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,456 psi | 73% | 2894 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,358 psi | 80% | 2936 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,226 psi | 77% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,843 psi | 64% | 2808 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 43,830 psi | 69% | 2920 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 50,749 psi | 80% | 3012 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,138 psi | 75% | 2953 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,501 psi | 48% | 2582 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,425 psi | 70% | 2920 fps | 99.6% |
| Hodgdon Superformance | 73.6 gr | 90% | 46,818 psi | 73% | 3005 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 42% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,151 psi | 72% | 2900 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 48,153 psi | 75% | 2946 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,554 psi | 67% | 2818 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,049 psi | 71% | 2841 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 47,050 psi | 74% | 2927 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,411 psi | 71% | 2874 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 34,490 psi | 54% | 2690 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,338 psi | 69% | 2904 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,821 psi | 78% | 2949 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,152 psi | 74% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,340 psi | 74% | 2874 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 42,395 psi | 66% | 2815 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,508 psi | 62% | 2753 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 42,757 psi | 67% | 2841 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,441 psi | 73% | 2887 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,978 psi | 74% | 2894 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,598 psi | 67% | 2858 fps | 98.8% |
| Norma 204 | <<locked>> | 94% | 50,488 psi | 79% | 3025 fps | 95% |
| Norma MRP | <<locked>> | 98% | 44,730 psi | 70% | 3015 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 35,882 psi | 56% | 2740 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 42,656 psi | 67% | 2874 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 39,972 psi | 63% | 2841 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 49,806 psi | 78% | 2959 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,530 psi | 78% | 2976 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,809 psi | 84% | 3005 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 42% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,249 psi | 65% | 2792 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,093 psi | 72% | 2989 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,260 psi | 58% | 2838 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,404 psi | 55% | 2753 fps | 95.1% |
| ReloadSwiss RS 70 | 67.6 gr | 86% | 37,869 psi | 59% | 2828 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 50,459 psi | 79% | 2930 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,222 psi | 69% | 2835 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,652 psi | 59% | 2743 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 46,456 psi | 73% | 2894 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,508 psi | 62% | 2753 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,152 psi | 74% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,395 psi | 66% | 2815 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,757 psi | 67% | 2841 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,798 psi | 61% | 2799 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,240 psi | 76% | 2933 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,166 psi | 72% | 2907 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,776 psi | 75% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,929 psi | 63% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,396 psi | 70% | 2812 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,355 psi | 74% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,109 psi | 75% | 2927 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 38,305 psi | 60% | 2746 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,920 psi | 44% | 2559 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 48,051 psi | 75% | 2972 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 53,838 psi | 84% | 2897 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,254 psi | 76% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,019 psi | 69% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,657 psi | 70% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,608 psi | 57% | 2680 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 34,954 psi | 55% | 2684 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 49,937 psi | 78% | 2946 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,004 psi | 67% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,840 psi | 58% | 2743 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 33,605 psi | 53% | 2726 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,358 psi | 51% | 2598 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 50,285 psi | 79% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,034 psi | 69% | 2927 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,140 psi | 49% | 2736 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,919 psi | 72% | 2913 fps | 99.6% |
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 | Barnes TSX FN FB. Alliant Reloder-17 delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,215 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 1:15.0 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .308 Norma Mag. with the .308 | 150gr | Barnes TSX FN FB 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.