Load Specifications
Load data in caliber .300 Win. 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 ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-16.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 55,608 psi | 89% | 2910 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,810 psi | 88% | 2936 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,650 psi | 86% | 2943 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,963 psi | 74% | 2894 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 55,071 psi | 88% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,753 psi | 89% | 3087 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 55,201 psi | 89% | 3025 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,318 psi | 90% | 3028 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 3064 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,940 psi | 86% | 2969 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,347 psi | 89% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,376 psi | 89% | 3153 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,113 psi | 85% | 2995 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,490 psi | 86% | 3015 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,301 psi | 85% | 3094 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,563 psi | 87% | 3127 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 3051 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,468 psi | 70% | 2923 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,676 psi | 80% | 3114 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,143 psi | 88% | 3041 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,766 psi | 86% | 3012 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,548 psi | 86% | 2982 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,405 psi | 89% | 2953 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,548 psi | 86% | 2999 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,578 psi | 88% | 3025 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,723 psi | 88% | 3084 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 55,042 psi | 88% | 3045 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 55,796 psi | 89% | 3035 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,171 psi | 85% | 3015 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,738 psi | 89% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,390 psi | 89% | 3123 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 57% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,563 psi | 86% | 2986 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,028 psi | 90% | 3015 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,767 psi | 89% | 3012 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,347 psi | 89% | 2986 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 54,346 psi | 87% | 3012 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,637 psi | 89% | 3018 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 56,333 psi | 90% | 3077 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,897 psi | 88% | 3048 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,940 psi | 86% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,056 psi | 88% | 2995 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,360 psi | 87% | 2949 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,535 psi | 89% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,245 psi | 89% | 3012 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 56,159 psi | 90% | 3048 fps | 98.5% |
| Norma 201 | <<locked>> | 84% | 53,577 psi | 86% | 2963 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,505 psi | 87% | 2969 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,405 psi | 90% | 3061 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,216 psi | 89% | 3068 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 49,139 psi | 79% | 3064 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 54,592 psi | 88% | 3071 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,519 psi | 86% | 3028 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,635 psi | 86% | 3071 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 54,186 psi | 87% | 2989 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,041 psi | 87% | 3009 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,607 psi | 88% | 3005 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,331 psi | 87% | 3087 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,012 psi | 87% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,622 psi | 89% | 3110 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,708 psi | 88% | 3140 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 54,317 psi | 87% | 2943 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,317 psi | 87% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,635 psi | 86% | 3002 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,590 psi | 83% | 3028 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 53,548 psi | 86% | 2982 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,245 psi | 89% | 3012 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,056 psi | 88% | 2995 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,535 psi | 89% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,159 psi | 90% | 3048 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,753 psi | 89% | 3071 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,405 psi | 90% | 3025 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,708 psi | 86% | 2995 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,911 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,753 psi | 89% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,274 psi | 89% | 2963 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,111 psi | 82% | 3022 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 54,389 psi | 87% | 2897 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,130 psi | 90% | 3015 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,896 psi | 86% | 3002 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,316 psi | 85% | 3077 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,417 psi | 84% | 3009 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 84% | 55,332 psi | 89% | 2884 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,288 psi | 87% | 2927 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,969 psi | 88% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,521 psi | 89% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,403 psi | 86% | 3012 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,447 psi | 87% | 2969 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,287 psi | 85% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,101 psi | 90% | 3074 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,472 psi | 78% | 3005 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,388 psi | 86% | 2986 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,752 psi | 88% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,969 psi | 88% | 3087 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,059 psi | 63% | 2946 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,650 psi | 86% | 3002 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% | 52,199 psi | 84% | 2864 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,788 psi | 72% | 2782 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,007 psi | 75% | 2825 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 39,914 psi | 64% | 2772 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 42,380 psi | 68% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,823 psi | 54% | 2651 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 48,530 psi | 78% | 2910 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,234 psi | 66% | 2753 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 50,444 psi | 81% | 3005 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,705 psi | 81% | 2920 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,750 psi | 83% | 2897 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,759 psi | 72% | 2956 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,031 psi | 66% | 2772 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,106 psi | 71% | 2844 fps | 98.9% |
| Alliant Reloder-16 | 58.1 gr | 82% | 33,953 psi | 54% | 2674 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,621 psi | 57% | 2746 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,342 psi | 79% | 2986 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,486 psi | 47% | 2566 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,796 psi | 59% | 2828 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,124 psi | 77% | 2920 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,857 psi | 66% | 2776 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 44,367 psi | 71% | 2812 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,141 psi | 84% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,096 psi | 80% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,524 psi | 67% | 2782 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 41,814 psi | 67% | 2838 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 48,414 psi | 78% | 2927 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 49,052 psi | 79% | 2923 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,167 psi | 47% | 2507 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,440 psi | 73% | 2897 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,266 psi | 71% | 2913 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 43% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,021 psi | 75% | 2871 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 49,110 psi | 79% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,323 psi | 69% | 2789 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,629 psi | 73% | 2812 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 44,947 psi | 72% | 2841 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,178 psi | 69% | 2785 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 32,764 psi | 53% | 2608 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 45,237 psi | 73% | 2877 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,705 psi | 81% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,964 psi | 77% | 2884 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,080 psi | 77% | 2841 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,207 psi | 69% | 2789 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,710 psi | 60% | 2671 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 40,741 psi | 65% | 2756 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 47,253 psi | 76% | 2858 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,819 psi | 77% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,439 psi | 70% | 2831 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 51,503 psi | 83% | 3002 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 42,540 psi | 68% | 2927 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 34,214 psi | 55% | 2657 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,468 psi | 70% | 2848 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 40,886 psi | 66% | 2825 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 50,618 psi | 81% | 2930 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,372 psi | 81% | 2946 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,901 psi | 67% | 2766 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,181 psi | 76% | 2963 fps | 99.3% |
| ReloadSwiss RS 60 | 61 gr | 80% | 37,956 psi | 61% | 2815 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,736 psi | 54% | 2671 fps | 95% |
| ReloadSwiss RS 70 | 65.1 gr | 84% | 35,998 psi | 58% | 2743 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 51,256 psi | 82% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,976 psi | 72% | 2805 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,290 psi | 61% | 2717 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 48,240 psi | 77% | 2969 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 44,367 psi | 71% | 2812 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,710 psi | 60% | 2671 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,964 psi | 77% | 2884 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,207 psi | 69% | 2789 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 40,741 psi | 65% | 2756 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,682 psi | 64% | 2772 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,081 psi | 79% | 2904 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,079 psi | 75% | 2877 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,501 psi | 78% | 2802 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,596 psi | 65% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,395 psi | 68% | 2730 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,790 psi | 77% | 2963 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,138 psi | 77% | 2799 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,965 psi | 79% | 2900 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 39,059 psi | 63% | 2723 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,413 psi | 46% | 2539 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 45,861 psi | 74% | 2890 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 48,994 psi | 79% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,831 psi | 72% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,310 psi | 73% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,188 psi | 60% | 2654 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 33,330 psi | 53% | 2605 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 50,879 psi | 82% | 2913 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,685 psi | 70% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,070 psi | 56% | 2657 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 32,053 psi | 51% | 2644 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,953 psi | 53% | 2575 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 51,140 psi | 82% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,814 psi | 67% | 2838 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,733 psi | 48% | 2657 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,702 psi | 75% | 2881 fps | 99.8% |
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 .300 Win. Mag. loaded with the .306 | 155gr | Fox Classic Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,153 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 (430 MPa), the top charges use 57–90 %, 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, 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. ReloadSwiss RS 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .300 Win. 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.