Load Specifications
Load data in caliber .300 WSM with .308 | 159gr | IBEX TRD 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.
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% | 55,593 psi | 87% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,477 psi | 87% | 2858 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,157 psi | 85% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,435 psi | 90% | 2890 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,252 psi | 71% | 2799 fps | 96.5% |
| Accurate 4064 | <<locked>> | 88% | 55,390 psi | 87% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,259 psi | 85% | 2979 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 57,392 psi | 90% | 2966 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,897 psi | 86% | 2913 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,449 psi | 88% | 2920 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,595 psi | 90% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,855 psi | 89% | 3087 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,419 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,767 psi | 87% | 2963 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,418 psi | 85% | 3022 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,927 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,627 psi | 67% | 2825 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,572 psi | 75% | 2989 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,217 psi | 90% | 2982 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 56,579 psi | 89% | 2966 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,999 psi | 88% | 2923 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,711 psi | 90% | 2894 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,130 psi | 88% | 2949 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,653 psi | 90% | 3048 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 56,231 psi | 88% | 2897 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,956 psi | 89% | 2972 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 92% | 54,114 psi | 85% | 2982 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 96% | 54,955 psi | 86% | 2949 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 84% | 54,897 psi | 86% | 2933 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2953 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,595 psi | 90% | 3015 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,681 psi | 89% | 3051 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,621 psi | 86% | 2913 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,652 psi | 89% | 2940 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,000 psi | 89% | 2936 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,333 psi | 88% | 2907 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 56,043 psi | 88% | 2949 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,406 psi | 90% | 2953 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,895 psi | 81% | 2927 fps | 99.3% |
| IMR 4895 | <<locked>> | 88% | 57,145 psi | 90% | 2992 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,449 psi | 88% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,447 psi | 85% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,492 psi | 89% | 2887 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,911 psi | 86% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,493 psi | 90% | 2953 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 54,940 psi | 86% | 2936 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 56,652 psi | 89% | 2917 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,855 psi | 89% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,056 psi | 86% | 2949 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 56,623 psi | 89% | 2995 fps | 96% |
| Norma URP | <<locked>> | 98% | 56,173 psi | 88% | 3012 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 55,230 psi | 87% | 2972 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,969 psi | 86% | 3005 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 56,478 psi | 89% | 2933 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,333 psi | 88% | 2956 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,029 psi | 89% | 2917 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,043 psi | 89% | 2949 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,362 psi | 88% | 3031 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,419 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,058 psi | 89% | 3048 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,101 psi | 88% | 3071 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 54,955 psi | 86% | 2854 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,246 psi | 90% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,362 psi | 88% | 2956 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,999 psi | 88% | 2923 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,493 psi | 90% | 2953 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,447 psi | 85% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,911 psi | 86% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,940 psi | 86% | 2936 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,377 psi | 90% | 3012 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,434 psi | 87% | 2917 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,883 psi | 88% | 2940 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,580 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,549 psi | 85% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,566 psi | 90% | 2900 fps | 97.9% |
| Somchem S335 | <<locked>> | 86% | 57,159 psi | 90% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,723 psi | 86% | 2904 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 56,231 psi | 88% | 2946 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3015 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2894 fps | 96.1% |
| Unknown powder | <<locked>> | 96% | 57,043 psi | 89% | 3018 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 82% | 56,188 psi | 88% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,058 psi | 89% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,739 psi | 89% | 2874 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,463 psi | 88% | 2881 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,392 psi | 90% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,740 psi | 90% | 2989 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,130 psi | 88% | 2923 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,434 psi | 88% | 2913 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,607 psi | 86% | 2986 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2904 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,998 psi | 86% | 2927 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,435 psi | 90% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,114 psi | 85% | 2982 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,566 psi | 60% | 2838 fps | 99.2% |
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% | 52,257 psi | 82% | 2772 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,267 psi | 73% | 2717 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,923 psi | 80% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,790 psi | 75% | 2733 fps | 95.1% |
| Accurate 3100 | <<locked>> | 96% | 39,813 psi | 62% | 2690 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 43,714 psi | 69% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,693 psi | 54% | 2592 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 48,167 psi | 75% | 2815 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 41,075 psi | 64% | 2661 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,038 psi | 78% | 2818 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,879 psi | 80% | 2802 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,743 psi | 69% | 2844 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,118 psi | 64% | 2687 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,961 psi | 69% | 2753 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 34,214 psi | 54% | 2592 fps | 95% |
| Alliant Reloder-17 | 54.2 gr | 80% | 35,766 psi | 56% | 2664 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 32,024 psi | 50% | 2559 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,680 psi | 57% | 2740 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,195 psi | 74% | 2815 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 41,321 psi | 65% | 2700 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 46,920 psi | 74% | 2766 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,517 psi | 81% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,298 psi | 77% | 2844 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,940 psi | 85% | 2992 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 53,026 psi | 83% | 2851 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,800 psi | 66% | 2700 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 86% | 44,527 psi | 70% | 2808 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 94% | 51,721 psi | 81% | 2894 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 48,675 psi | 76% | 2825 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,950 psi | 47% | 2444 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,105 psi | 66% | 2749 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 90% | 46,267 psi | 73% | 2864 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,163 psi | 68% | 2710 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 44,657 psi | 70% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,393 psi | 63% | 2638 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,005 psi | 71% | 2703 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 46,775 psi | 73% | 2789 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,484 psi | 71% | 2743 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 34,316 psi | 54% | 2569 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 45,049 psi | 71% | 2785 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 50,038 psi | 78% | 2818 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,863 psi | 75% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,718 psi | 75% | 2743 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 43,555 psi | 68% | 2707 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 40,654 psi | 64% | 2648 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 43,482 psi | 68% | 2726 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,543 psi | 75% | 2766 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,558 psi | 75% | 2772 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,366 psi | 68% | 2740 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 52,910 psi | 83% | 2936 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 36,651 psi | 57% | 2638 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 42,656 psi | 67% | 2749 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 42,743 psi | 67% | 2782 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 49,879 psi | 78% | 2822 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,574 psi | 78% | 2844 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,751 psi | 84% | 2864 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 43% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,771 psi | 65% | 2674 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,311 psi | 73% | 2861 fps | 98.9% |
| ReloadSwiss RS 60 | 54.2 gr | 80% | 37,855 psi | 59% | 2730 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,158 psi | 57% | 2654 fps | 95.4% |
| ReloadSwiss RS 70 | 59.2 gr | 86% | 38,334 psi | 60% | 2713 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 52,011 psi | 82% | 2808 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,455 psi | 71% | 2720 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 39,030 psi | 61% | 2644 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 46,920 psi | 74% | 2766 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,654 psi | 64% | 2648 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,863 psi | 75% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,555 psi | 68% | 2707 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 43,482 psi | 68% | 2726 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,421 psi | 62% | 2687 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,617 psi | 76% | 2802 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,557 psi | 73% | 2782 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,414 psi | 76% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,698 psi | 64% | 2579 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,150 psi | 71% | 2694 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 48,138 psi | 75% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,095 psi | 75% | 2795 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 39,479 psi | 62% | 2644 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 29,443 psi | 46% | 2487 fps | 96.6% |
| Somchem S385 | <<locked>> | 98% | 47,776 psi | 75% | 2841 fps | 95.4% |
| Unknown powder | <<locked>> | 82% | 37,115 psi | 58% | 2638 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 53,113 psi | 83% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,614 psi | 71% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,976 psi | 70% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,657 psi | 70% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,142 psi | 54% | 2503 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 80% | 34,853 psi | 55% | 2556 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 52,794 psi | 83% | 2871 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,208 psi | 69% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,549 psi | 56% | 2605 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 32,590 psi | 51% | 2585 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,301 psi | 52% | 2503 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 53,795 psi | 84% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,527 psi | 70% | 2808 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,472 psi | 48% | 2585 fps | 95.5% |
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 .300 WSM loaded with the .308 | 159gr | IBEX TRD. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,087 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 57–90 %, leaving at least 10 % headroom. The 159.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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 .300 WSM with the .308 | 159gr | IBEX TRD 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.