Load Specifications
Load data in caliber .308 Norma Mag. with .306 | 155gr | Fox Classic Hunter 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% | 57,145 psi | 90% | 2923 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,840 psi | 88% | 2946 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,244 psi | 85% | 2966 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,158 psi | 86% | 2949 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,395 psi | 68% | 2835 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 56,115 psi | 88% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,768 psi | 89% | 3094 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,362 psi | 88% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,201 psi | 85% | 2982 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,288 psi | 87% | 2979 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,478 psi | 89% | 2953 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,782 psi | 89% | 3163 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,215 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,621 psi | 86% | 3022 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,550 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,191 psi | 65% | 2864 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,557 psi | 73% | 3041 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,478 psi | 89% | 3048 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,737 psi | 86% | 3015 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,752 psi | 86% | 2989 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,840 psi | 89% | 2963 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,969 psi | 86% | 3009 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,130 psi | 90% | 3117 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 55,724 psi | 87% | 3031 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 55,782 psi | 87% | 3087 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 56,304 psi | 88% | 3051 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 56,942 psi | 89% | 3041 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,070 psi | 85% | 3018 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,000 psi | 89% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,666 psi | 89% | 3130 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 56% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,679 psi | 86% | 2992 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,261 psi | 90% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,116 psi | 90% | 3018 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,797 psi | 89% | 2995 fps | 98.1% |
| IMR 4350 | <<locked>> | 98% | 55,506 psi | 87% | 3018 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,942 psi | 89% | 3025 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3081 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 56,043 psi | 88% | 3054 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,288 psi | 87% | 2979 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,478 psi | 89% | 3009 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,796 psi | 87% | 2959 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,724 psi | 89% | 3009 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,231 psi | 88% | 3015 fps | 99% |
| Lovex S070 | <<locked>> | 98% | 57,290 psi | 90% | 3051 fps | 98.4% |
| Norma 201 | <<locked>> | 86% | 54,897 psi | 86% | 2972 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,854 psi | 88% | 2976 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,435 psi | 90% | 3064 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,275 psi | 88% | 3068 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 55,564 psi | 87% | 3074 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 54,766 psi | 86% | 3038 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,433 psi | 85% | 3071 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 55,564 psi | 87% | 2999 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,492 psi | 87% | 3018 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,130 psi | 88% | 2982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,998 psi | 56% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,101 psi | 88% | 3015 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,390 psi | 87% | 3094 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,129 psi | 86% | 3130 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,434 psi | 88% | 3110 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,840 psi | 88% | 3143 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 55,724 psi | 87% | 2953 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,448 psi | 87% | 2972 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,578 psi | 86% | 3009 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,752 psi | 86% | 2989 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,231 psi | 88% | 3015 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,478 psi | 89% | 3009 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,724 psi | 89% | 3009 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,290 psi | 90% | 3051 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,623 psi | 89% | 3074 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,041 psi | 85% | 2976 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,926 psi | 86% | 3002 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,594 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,884 psi | 89% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,536 psi | 89% | 2966 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 56,637 psi | 89% | 3012 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,796 psi | 87% | 2907 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,595 psi | 90% | 3025 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,882 psi | 86% | 3005 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3081 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,647 psi | 78% | 2949 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 82% | 56,057 psi | 88% | 2871 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,971 psi | 89% | 2897 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,521 psi | 87% | 2936 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,449 psi | 88% | 2956 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,507 psi | 89% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,578 psi | 86% | 3022 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 55,912 psi | 88% | 2982 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,563 psi | 86% | 2949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,000 psi | 89% | 3077 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,614 psi | 71% | 2946 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,766 psi | 86% | 2995 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,159 psi | 88% | 3031 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,028 psi | 88% | 3091 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,796 psi | 58% | 2867 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,897 psi | 86% | 3012 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% | 50,328 psi | 79% | 2825 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,670 psi | 67% | 2740 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,531 psi | 79% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,298 psi | 76% | 2835 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 40,437 psi | 63% | 2776 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 40,379 psi | 63% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,330 psi | 54% | 2657 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,485 psi | 73% | 2864 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,566 psi | 62% | 2703 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,631 psi | 76% | 2871 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,400 psi | 77% | 2854 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,685 psi | 67% | 2900 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,247 psi | 62% | 2726 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,090 psi | 66% | 2792 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,563 psi | 54% | 2680 fps | 95.5% |
| Alliant Reloder-17 | 58.9 gr | 80% | 33,982 psi | 53% | 2690 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,921 psi | 47% | 2572 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,376 psi | 59% | 2831 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,035 psi | 72% | 2871 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 38,827 psi | 61% | 2726 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 45,324 psi | 71% | 2815 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,357 psi | 79% | 2861 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,834 psi | 75% | 2894 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,258 psi | 83% | 3054 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,653 psi | 62% | 2730 fps | 96.5% |
| Hodgdon H414 | 64.8 gr | 90% | 45,513 psi | 71% | 2904 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 90% | 49,313 psi | 77% | 2930 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,934 psi | 74% | 2874 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,733 psi | 47% | 2513 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,149 psi | 68% | 2844 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 90% | 45,339 psi | 71% | 2923 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 41% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,034 psi | 71% | 2825 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,862 psi | 73% | 2867 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,539 psi | 65% | 2740 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,034 psi | 69% | 2766 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 45,788 psi | 72% | 2844 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,222 psi | 69% | 2795 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 35,650 psi | 56% | 2674 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 43,134 psi | 68% | 2825 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 48,631 psi | 76% | 2871 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,788 psi | 72% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,354 psi | 73% | 2795 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 41,365 psi | 65% | 2743 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,609 psi | 61% | 2680 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 44,454 psi | 70% | 2825 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 45,368 psi | 71% | 2812 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,905 psi | 72% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,466 psi | 65% | 2779 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 52,344 psi | 82% | 3005 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 34,766 psi | 54% | 2664 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,365 psi | 65% | 2795 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 41,524 psi | 65% | 2828 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,646 psi | 76% | 2881 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,457 psi | 76% | 2904 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,547 psi | 82% | 2923 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 42% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,888 psi | 67% | 2776 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,933 psi | 70% | 2910 fps | 98.8% |
| ReloadSwiss RS 60 | 58.9 gr | 80% | 36,260 psi | 57% | 2762 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,767 psi | 58% | 2740 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,407 psi | 62% | 2815 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 49,211 psi | 77% | 2851 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,105 psi | 68% | 2759 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,506 psi | 57% | 2667 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 45,324 psi | 71% | 2815 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,609 psi | 61% | 2680 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,788 psi | 72% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,365 psi | 65% | 2743 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 44,454 psi | 70% | 2825 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,826 psi | 59% | 2726 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,978 psi | 74% | 2854 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,165 psi | 71% | 2835 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,818 psi | 73% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,030 psi | 61% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,395 psi | 68% | 2736 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 52,910 psi | 83% | 2956 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,340 psi | 73% | 2762 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,862 psi | 73% | 2851 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,347 psi | 59% | 2674 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 27,050 psi | 42% | 2487 fps | 95.5% |
| Somchem S385 | <<locked>> | 98% | 46,427 psi | 73% | 2890 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 52,794 psi | 83% | 2825 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,253 psi | 74% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,960 psi | 67% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,468 psi | 68% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,534 psi | 56% | 2608 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 36,260 psi | 57% | 2667 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,776 psi | 76% | 2867 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,829 psi | 66% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,723 psi | 56% | 2667 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 32,358 psi | 51% | 2651 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,502 psi | 49% | 2526 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 48,762 psi | 76% | 2913 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,598 psi | 67% | 2844 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,110 psi | 47% | 2654 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,759 psi | 70% | 2838 fps | 99.5% |
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 .306 | 155gr | Fox Classic Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,163 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 155.0 gr projectile in 0.306" calls for a 1:11.5 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, Hodgdon H414 rank at the top here: for .308 Norma Mag. with the .306 | 155gr | Fox Classic 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.