Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 170gr | TWENTY-NINE ERTP 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 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 54,969 psi | 88% | 2795 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,142 psi | 85% | 2805 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,806 psi | 80% | 2835 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 55,317 psi | 89% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,651 psi | 89% | 2949 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,201 psi | 87% | 3028 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 82% | 54,549 psi | 87% | 2874 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,666 psi | 89% | 2877 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,359 psi | 86% | 2930 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,824 psi | 88% | 3002 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,359 psi | 86% | 2930 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,359 psi | 86% | 2930 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,275 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,171 psi | 85% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 52,953 psi | 85% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,012 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2976 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,487 psi | 79% | 2910 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,586 psi | 75% | 2854 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,930 psi | 66% | 2766 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,272 psi | 85% | 3045 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,447 psi | 87% | 2890 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 53,592 psi | 86% | 2867 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,487 psi | 79% | 2910 fps | 96.6% |
| Bofors RP7 | <<locked>> | 90% | 53,330 psi | 86% | 2848 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 54,027 psi | 87% | 2881 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 54,389 psi | 87% | 2946 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 54,505 psi | 87% | 2904 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 55,129 psi | 88% | 2884 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,316 psi | 85% | 2877 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,114 psi | 88% | 2920 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,679 psi | 88% | 2982 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,201 psi | 58% | 1791 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,173 psi | 90% | 2884 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,811 psi | 89% | 2864 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,317 psi | 89% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,592 psi | 88% | 2844 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 53,983 psi | 87% | 2877 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,969 psi | 88% | 2874 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 56,115 psi | 90% | 2940 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,505 psi | 87% | 2900 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,911 psi | 88% | 2851 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,534 psi | 86% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,347 psi | 89% | 2858 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,708 psi | 88% | 2871 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 55,941 psi | 90% | 2910 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,191 psi | 66% | 2680 fps | 97% |
| Norma 201 | <<locked>> | 82% | 53,476 psi | 86% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,056 psi | 87% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,854 psi | 90% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,549 psi | 87% | 2927 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 52,460 psi | 84% | 2995 fps | 98.5% |
| Norma URP | <<locked>> | 94% | 54,418 psi | 87% | 2933 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,084 psi | 85% | 2884 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,258 psi | 85% | 2930 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 59% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,230 psi | 87% | 2867 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,882 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,809 psi | 86% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,535 psi | 89% | 2972 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,375 psi | 87% | 2999 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,027 psi | 87% | 2822 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,751 psi | 86% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,187 psi | 88% | 2904 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2956 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 53,330 psi | 86% | 2848 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,708 psi | 88% | 2871 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,911 psi | 88% | 2851 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,347 psi | 89% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,941 psi | 90% | 2910 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,071 psi | 88% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,782 psi | 89% | 2881 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,055 psi | 85% | 2848 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,404 psi | 87% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,143 psi | 88% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,723 psi | 88% | 2825 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2953 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 54,128 psi | 87% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,434 psi | 89% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,766 psi | 86% | 2861 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,345 psi | 86% | 2936 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,811 psi | 89% | 2936 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 54,868 psi | 88% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,143 psi | 87% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,607 psi | 88% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,882 psi | 88% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,113 psi | 85% | 2874 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,240 psi | 77% | 2799 fps | 96.7% |
| Vihtavuori N540 | <<locked>> | 86% | 56,115 psi | 90% | 2841 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,898 psi | 90% | 2936 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,243 psi | 84% | 2936 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,953 psi | 85% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,650 psi | 88% | 2946 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,163 psi | 68% | 2900 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 52,910 psi | 85% | 2851 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,489 psi | 84% | 2874 fps | 97% |
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% | 48,414 psi | 78% | 2700 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,673 psi | 75% | 2694 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 35,273 psi | 57% | 2549 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,803 psi | 73% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,403 psi | 55% | 2546 fps | 96.7% |
| Accurate High Country | <<locked>> | 98% | 50,473 psi | 81% | 2963 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 51,256 psi | 82% | 2822 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,642 psi | 70% | 2674 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,876 psi | 75% | 2815 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,601 psi | 76% | 2881 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 46,702 psi | 75% | 2808 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 46,702 psi | 75% | 2808 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,801 psi | 70% | 2697 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,804 psi | 75% | 2766 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,968 psi | 54% | 2556 fps | 96.7% |
| Alliant Reloder-17 | 59 gr | 80% | 38,334 psi | 61% | 2687 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,108 psi | 74% | 2802 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,311 psi | 74% | 2851 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,094 psi | 45% | 2415 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,100 psi | 58% | 2648 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,300 psi | 52% | 2592 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,937 psi | 82% | 2838 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,874 psi | 70% | 2707 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 46,311 psi | 74% | 2851 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 41,408 psi | 66% | 2625 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 44,338 psi | 71% | 2713 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 39,015 psi | 63% | 2651 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 45,121 psi | 72% | 2736 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 51,779 psi | 83% | 2831 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,531 psi | 51% | 2457 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,225 psi | 77% | 2812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,886 psi | 66% | 2720 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 43% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,516 psi | 79% | 2782 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,199 psi | 84% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,905 psi | 74% | 2710 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,196 psi | 77% | 2733 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 41,989 psi | 67% | 2661 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,292 psi | 65% | 2602 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 33,214 psi | 53% | 2503 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 47,993 psi | 77% | 2795 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,256 psi | 82% | 2799 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,531 psi | 81% | 2753 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,992 psi | 74% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,898 psi | 61% | 2552 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 38,508 psi | 62% | 2585 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 36,274 psi | 58% | 2572 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,198 psi | 80% | 2769 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,749 psi | 81% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,166 psi | 74% | 2753 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,630 psi | 76% | 2808 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 39,958 psi | 64% | 2749 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,490 psi | 55% | 2546 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 46,325 psi | 74% | 2772 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,781 psi | 57% | 2585 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 44% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,585 psi | 71% | 2697 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,169 psi | 80% | 2877 fps | 99.9% |
| ReloadSwiss RS 60 | 59 gr | 80% | 40,756 psi | 65% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,113 psi | 55% | 2562 fps | 96.2% |
| ReloadSwiss RS 70 | 59.9 gr | 80% | 33,576 psi | 54% | 2562 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 47,805 psi | 77% | 2723 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,336 psi | 66% | 2651 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 51,692 psi | 83% | 2844 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 45,049 psi | 72% | 2782 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,408 psi | 66% | 2625 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,898 psi | 61% | 2552 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,256 psi | 82% | 2799 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,992 psi | 74% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,508 psi | 62% | 2585 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,279 psi | 68% | 2700 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,083 psi | 84% | 2822 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,647 psi | 80% | 2792 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,213 psi | 82% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,120 psi | 69% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,523 psi | 63% | 2549 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,614 psi | 72% | 2776 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,836 psi | 82% | 2707 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,837 psi | 83% | 2812 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,843 psi | 67% | 2654 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,980 psi | 50% | 2500 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 42,902 psi | 69% | 2710 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,706 psi | 83% | 2694 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,892 psi | 77% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,095 psi | 77% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,856 psi | 64% | 2585 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,853 psi | 57% | 2546 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 42,293 psi | 68% | 2687 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 46,369 psi | 74% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,302 psi | 57% | 2546 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 28,776 psi | 46% | 2438 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,215 psi | 56% | 2520 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 39,189 psi | 63% | 2657 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,513 psi | 43% | 2438 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,690 psi | 80% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,600 psi | 73% | 2753 fps | 95.3% |
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 | 170gr | TWENTY-NINE ERTP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,045 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 170.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 170gr | TWENTY-NINE ERTP 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.