Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 166gr | Hammer Stone Hammer bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 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.
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 2495 | <<locked>> | 84% | 54,766 psi | 88% | 2841 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,607 psi | 88% | 2867 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,966 psi | 80% | 2884 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 55,071 psi | 88% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,159 psi | 90% | 3005 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 54,853 psi | 88% | 2930 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,115 psi | 90% | 2936 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,751 psi | 86% | 2986 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,332 psi | 89% | 3061 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,751 psi | 86% | 2982 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,156 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,301 psi | 85% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,534 psi | 86% | 3009 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,737 psi | 88% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,968 psi | 85% | 2972 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,024 psi | 80% | 2966 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,094 psi | 76% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,060 psi | 66% | 2812 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 3104 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,679 psi | 88% | 2943 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 53,679 psi | 86% | 2920 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,024 psi | 80% | 2966 fps | 96.8% |
| Bofors RP7 | <<locked>> | 90% | 53,417 psi | 86% | 2900 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 54,375 psi | 87% | 2936 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,231 psi | 90% | 3022 fps | 99% |
| Hodgdon H4350 | <<locked>> | 92% | 53,171 psi | 85% | 2930 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 55,463 psi | 89% | 2940 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,505 psi | 86% | 2930 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,883 psi | 90% | 2982 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,347 psi | 89% | 3041 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 58% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,521 psi | 89% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,592 psi | 88% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,868 psi | 88% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,824 psi | 86% | 2881 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 54,317 psi | 87% | 2933 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,187 psi | 88% | 2930 fps | 98.8% |
| IMR 4831 | <<locked>> | 98% | 53,824 psi | 86% | 2953 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 54,723 psi | 88% | 2956 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,911 psi | 88% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,795 psi | 86% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,477 psi | 89% | 2910 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,911 psi | 88% | 2923 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 56,173 psi | 90% | 2963 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,263 psi | 66% | 2726 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 53,229 psi | 85% | 2867 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,201 psi | 87% | 2871 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,159 psi | 90% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,013 psi | 88% | 2982 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 53,171 psi | 85% | 3054 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 54,839 psi | 88% | 2986 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,476 psi | 86% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,518 psi | 84% | 3012 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 94% | 53,708 psi | 86% | 2986 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,950 psi | 78% | 2923 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,331 psi | 87% | 2917 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,114 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,128 psi | 87% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,130 psi | 90% | 3028 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,868 psi | 88% | 3058 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 53,969 psi | 87% | 2871 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,809 psi | 86% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,579 psi | 89% | 2959 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,622 psi | 89% | 3015 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 53,417 psi | 86% | 2900 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,911 psi | 88% | 2923 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,911 psi | 88% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,477 psi | 89% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,173 psi | 90% | 2963 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,637 psi | 89% | 2979 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,825 psi | 90% | 2930 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,214 psi | 85% | 2897 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,491 psi | 87% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,434 psi | 89% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,027 psi | 88% | 2881 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 3009 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 53,911 psi | 86% | 2802 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,637 psi | 89% | 2917 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,969 psi | 87% | 2913 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,954 psi | 87% | 2992 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2992 fps | 98.6% |
| Unknown powder | <<locked>> | 92% | 55,666 psi | 89% | 2995 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 84% | 54,578 psi | 88% | 2789 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,331 psi | 87% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,940 psi | 86% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,506 psi | 89% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,202 psi | 90% | 2966 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,818 psi | 75% | 2818 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 84% | 53,664 psi | 86% | 2867 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 52,939 psi | 85% | 2956 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,504 psi | 84% | 2986 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,229 psi | 85% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,231 psi | 90% | 3022 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,380 psi | 68% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,868 psi | 88% | 2959 fps | 97.5% |
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 2495 | <<locked>> | 80% | 47,877 psi | 77% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,698 psi | 67% | 2635 fps | 95.2% |
| Accurate 3100 | <<locked>> | 90% | 35,056 psi | 56% | 2585 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 45,339 psi | 73% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,171 psi | 55% | 2582 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 51,387 psi | 82% | 2874 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,671 psi | 70% | 2720 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 47,137 psi | 76% | 2867 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,790 psi | 77% | 2930 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,152 psi | 76% | 2864 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,714 psi | 70% | 2743 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,862 psi | 75% | 2815 fps | 99.7% |
| Alliant Reloder-16 | 57.3 gr | 80% | 33,968 psi | 54% | 2602 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,348 psi | 61% | 2733 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,543 psi | 75% | 2854 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,598 psi | 70% | 2841 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,876 psi | 45% | 2448 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,100 psi | 58% | 2690 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,068 psi | 51% | 2625 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,242 psi | 82% | 2887 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,700 psi | 70% | 2749 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 43,598 psi | 70% | 2841 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 41,278 psi | 66% | 2671 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 44,425 psi | 71% | 2762 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,726 psi | 64% | 2713 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 86% | 43,990 psi | 71% | 2762 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 51,938 psi | 83% | 2884 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,343 psi | 50% | 2493 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,701 psi | 73% | 2815 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,017 psi | 66% | 2769 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 43% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,108 psi | 74% | 2769 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,124 psi | 77% | 2799 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,714 psi | 68% | 2697 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,134 psi | 68% | 2664 fps | 96.2% |
| IMR 4350 | <<locked>> | 86% | 42,148 psi | 68% | 2710 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,379 psi | 65% | 2651 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 31,995 psi | 51% | 2513 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 48,080 psi | 77% | 2844 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,329 psi | 82% | 2848 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,604 psi | 81% | 2802 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,876 psi | 74% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,666 psi | 60% | 2595 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 38,290 psi | 61% | 2625 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 36,085 psi | 58% | 2612 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 50,009 psi | 80% | 2815 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,676 psi | 81% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,238 psi | 74% | 2802 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,979 psi | 77% | 2861 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 39,914 psi | 64% | 2792 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,258 psi | 55% | 2582 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 46,383 psi | 74% | 2822 fps | 99.8% |
| Ramshot Grand | <<locked>> | 96% | 48,617 psi | 78% | 2940 fps | 95% |
| Ramshot Hunter | <<locked>> | 82% | 35,665 psi | 57% | 2625 fps | 95% |
| Ramshot Magnum | <<locked>> | 96% | 41,872 psi | 67% | 2782 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,267 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,643 psi | 72% | 2746 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,517 psi | 81% | 2933 fps | 99.9% |
| ReloadSwiss RS 60 | 61.7 gr | 80% | 40,828 psi | 65% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,982 psi | 54% | 2598 fps | 96.1% |
| ReloadSwiss RS 70 | 62.6 gr | 80% | 33,417 psi | 54% | 2602 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 47,659 psi | 76% | 2769 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,046 psi | 66% | 2690 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 51,996 psi | 83% | 2900 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 94% | 45,527 psi | 73% | 2838 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 41,278 psi | 66% | 2671 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,666 psi | 60% | 2595 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,329 psi | 82% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,876 psi | 74% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,290 psi | 61% | 2625 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,424 psi | 68% | 2749 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,286 psi | 84% | 2877 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,864 psi | 80% | 2844 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,155 psi | 82% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,033 psi | 69% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,465 psi | 63% | 2595 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,107 psi | 72% | 2831 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,778 psi | 81% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,098 psi | 84% | 2864 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,655 psi | 67% | 2697 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,835 psi | 49% | 2536 fps | 98.5% |
| Somchem S385 | <<locked>> | 90% | 40,335 psi | 65% | 2700 fps | 95% |
| Unknown powder | <<locked>> | 80% | 37,246 psi | 60% | 2648 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 80% | 48,356 psi | 78% | 2697 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,790 psi | 77% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,427 psi | 76% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,665 psi | 57% | 2543 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 37,246 psi | 60% | 2621 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 98% | 43,700 psi | 70% | 2759 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 47,094 psi | 76% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,840 psi | 61% | 2664 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 30,487 psi | 49% | 2526 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,230 psi | 56% | 2566 fps | 98.8% |
| Winchester 760 | <<locked>> | 80% | 39,726 psi | 64% | 2713 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,252 psi | 42% | 2467 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,326 psi | 76% | 2831 fps | 95.8% |
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 96 powders for .300 Win. Mag. loaded with the .308 | 166gr | Hammer Stone Hammer. Alliant Reloder-26 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,104 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, 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. ReloadSwiss RS 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 166gr | Hammer Stone Hammer 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.