Load Specifications
Load data in caliber .308 Norma Mag. with .308 | 150gr | Swift Scirocco 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 ReloadSwiss RS 70.
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% | 57,638 psi | 90% | 2972 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,666 psi | 89% | 2999 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,650 psi | 86% | 3012 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,521 psi | 87% | 2995 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,976 psi | 69% | 2881 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 56,797 psi | 89% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,203 psi | 90% | 3140 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 56,826 psi | 89% | 3081 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,331 psi | 85% | 3025 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,738 psi | 87% | 3028 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,753 psi | 89% | 3002 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,942 psi | 89% | 3209 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,723 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,114 psi | 86% | 3074 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,433 psi | 85% | 3143 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,695 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,611 psi | 65% | 2910 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,036 psi | 74% | 3091 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,753 psi | 89% | 3097 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 55,303 psi | 87% | 3068 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,201 psi | 87% | 3031 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,319 psi | 90% | 3012 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,230 psi | 87% | 3054 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,493 psi | 90% | 3166 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 56,202 psi | 88% | 3081 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 55,999 psi | 88% | 3130 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 56,550 psi | 89% | 3094 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 57,479 psi | 90% | 3094 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3064 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,261 psi | 90% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,710 psi | 89% | 3169 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1900 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,100 psi | 86% | 3041 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,537 psi | 90% | 3074 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,217 psi | 90% | 3061 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,174 psi | 90% | 3041 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 55,680 psi | 87% | 3061 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,956 psi | 89% | 3068 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3127 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 56,507 psi | 89% | 3104 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,738 psi | 87% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,797 psi | 89% | 3054 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,014 psi | 88% | 3002 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 57,319 psi | 90% | 3061 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,637 psi | 89% | 3061 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 57,682 psi | 90% | 3097 fps | 98.2% |
| Norma 201 | <<locked>> | 86% | 55,593 psi | 87% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,144 psi | 88% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,360 psi | 85% | 3058 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 56,391 psi | 88% | 3110 fps | 96% |
| Norma URP | <<locked>> | 98% | 55,767 psi | 87% | 3120 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 55,100 psi | 86% | 3084 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,621 psi | 86% | 3114 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 55,912 psi | 88% | 3045 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,651 psi | 87% | 3064 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,550 psi | 89% | 3031 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,143 psi | 57% | 1939 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,434 psi | 88% | 3061 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,782 psi | 87% | 3143 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,317 psi | 87% | 3179 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,898 psi | 89% | 3159 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,173 psi | 88% | 3189 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 56,434 psi | 88% | 3005 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,144 psi | 88% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,172 psi | 86% | 3058 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,201 psi | 87% | 3031 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,637 psi | 89% | 3061 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,797 psi | 89% | 3054 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,319 psi | 90% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,682 psi | 90% | 3097 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,898 psi | 89% | 3120 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,520 psi | 85% | 3022 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,347 psi | 87% | 3051 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,913 psi | 89% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,290 psi | 90% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,956 psi | 89% | 3012 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 57,130 psi | 90% | 3064 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,391 psi | 88% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,143 psi | 85% | 3015 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 55,376 psi | 87% | 3054 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3123 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2999 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 56,420 psi | 88% | 2920 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,188 psi | 90% | 2943 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,883 psi | 88% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,637 psi | 89% | 3002 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,869 psi | 89% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,824 psi | 86% | 3064 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 56,173 psi | 88% | 3028 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,766 psi | 86% | 2992 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,508 psi | 90% | 3127 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,093 psi | 72% | 2995 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,868 psi | 86% | 3038 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,275 psi | 88% | 3077 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,246 psi | 88% | 3136 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,434 psi | 59% | 2917 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,245 psi | 87% | 3058 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% | 50,952 psi | 80% | 2877 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,714 psi | 69% | 2795 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,995 psi | 80% | 2956 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,588 psi | 76% | 2874 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 41,075 psi | 64% | 2825 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,350 psi | 65% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,143 psi | 55% | 2710 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 46,905 psi | 74% | 2910 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 39,972 psi | 63% | 2749 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,965 psi | 77% | 2917 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,835 psi | 78% | 2904 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,917 psi | 67% | 2943 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,726 psi | 62% | 2772 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,583 psi | 67% | 2838 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,983 psi | 55% | 2723 fps | 95.2% |
| Alliant Reloder-17 | 59.4 gr | 80% | 34,447 psi | 54% | 2736 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 32,416 psi | 51% | 2674 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,855 psi | 59% | 2877 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,311 psi | 73% | 2913 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 39,508 psi | 62% | 2776 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 48,689 psi | 76% | 2917 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,705 psi | 79% | 2907 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,240 psi | 76% | 2943 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,388 psi | 84% | 3100 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 40,379 psi | 63% | 2779 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 90% | 45,919 psi | 72% | 2949 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 90% | 49,632 psi | 78% | 2972 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 47,398 psi | 74% | 2923 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,284 psi | 47% | 2559 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,714 psi | 69% | 2894 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 49,095 psi | 77% | 3035 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 42% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,353 psi | 71% | 2867 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 47,282 psi | 74% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,989 psi | 66% | 2789 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,425 psi | 70% | 2808 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 46,180 psi | 72% | 2890 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,541 psi | 70% | 2838 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 36,332 psi | 57% | 2723 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 43,656 psi | 68% | 2874 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 48,965 psi | 77% | 2917 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,572 psi | 73% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,717 psi | 73% | 2844 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,945 psi | 66% | 2792 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 39,160 psi | 61% | 2726 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 44,889 psi | 70% | 2867 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,992 psi | 72% | 2861 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 46,383 psi | 73% | 2867 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,959 psi | 66% | 2828 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 52,837 psi | 83% | 3048 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 35,215 psi | 55% | 2710 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 41,698 psi | 65% | 2841 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,959 psi | 66% | 2874 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 49,124 psi | 77% | 2927 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,689 psi | 76% | 2946 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,808 psi | 83% | 2969 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,453 psi | 68% | 2822 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,295 psi | 71% | 2956 fps | 98.6% |
| ReloadSwiss RS 60 | 59.4 gr | 80% | 36,637 psi | 57% | 2808 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,333 psi | 59% | 2789 fps | 95.6% |
| ReloadSwiss RS 70 | 66.4 gr | 88% | 39,885 psi | 63% | 2861 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 50,024 psi | 78% | 2904 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,787 psi | 69% | 2808 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 37,188 psi | 58% | 2717 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 48,689 psi | 76% | 2917 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,160 psi | 61% | 2726 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,572 psi | 73% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,945 psi | 66% | 2792 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 44,889 psi | 70% | 2867 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,232 psi | 60% | 2769 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,630 psi | 75% | 2900 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,527 psi | 71% | 2877 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,282 psi | 74% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,523 psi | 62% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,801 psi | 69% | 2779 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 53,229 psi | 83% | 3002 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,891 psi | 73% | 2808 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,123 psi | 74% | 2894 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 37,942 psi | 59% | 2723 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 27,659 psi | 43% | 2533 fps | 95.4% |
| Somchem S385 | <<locked>> | 98% | 46,804 psi | 73% | 2933 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 53,214 psi | 83% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,674 psi | 75% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,511 psi | 68% | 2792 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,903 psi | 69% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,114 psi | 57% | 2654 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 36,869 psi | 58% | 2717 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 49,139 psi | 77% | 2913 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 42,482 psi | 67% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,361 psi | 57% | 2717 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 33,040 psi | 52% | 2703 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,952 psi | 50% | 2569 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 49,298 psi | 77% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 45,919 psi | 72% | 2949 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,719 psi | 48% | 2700 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,078 psi | 71% | 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 115 powders for .308 Norma Mag. loaded with the .308 | 150gr | Swift Scirocco. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,209 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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, ReloadSwiss RS 70 rank at the top here: for .308 Norma Mag. with the .308 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.