Load Specifications
Load data in caliber .300 WSM with .308 | 155gr | Berger BT Target bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance 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 2015 | <<locked>> | 84% | 55,927 psi | 88% | 2894 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,708 psi | 86% | 2917 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,853 psi | 86% | 2972 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,056 psi | 86% | 2917 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 54,998 psi | 86% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,665 psi | 86% | 3048 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 55,100 psi | 86% | 2999 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,144 psi | 88% | 2995 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,566 psi | 90% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,911 psi | 86% | 2923 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,868 psi | 86% | 3120 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,246 psi | 88% | 3018 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,898 psi | 89% | 3045 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3107 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,276 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,016 psi | 63% | 2828 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,933 psi | 70% | 2995 fps | 98% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,042 psi | 86% | 3012 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 57,101 psi | 89% | 3038 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,942 psi | 89% | 3005 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,753 psi | 87% | 2930 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,072 psi | 89% | 3028 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,492 psi | 87% | 3077 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 57,508 psi | 90% | 2982 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,346 psi | 85% | 2992 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 55,637 psi | 87% | 3071 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 98% | 56,057 psi | 88% | 3028 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,709 psi | 87% | 3009 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2976 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,303 psi | 87% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,636 psi | 86% | 3081 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 56% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,753 psi | 87% | 2995 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,537 psi | 90% | 3018 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,839 psi | 86% | 2966 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,682 psi | 90% | 2992 fps | 98% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3028 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,390 psi | 87% | 2982 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,008 psi | 77% | 2940 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 54,607 psi | 86% | 3018 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,566 psi | 90% | 2999 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,853 psi | 86% | 2972 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,534 psi | 85% | 2923 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,390 psi | 87% | 2976 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,781 psi | 86% | 2976 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 55,695 psi | 87% | 3012 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 57,174 psi | 90% | 2992 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,244 psi | 85% | 2943 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,072 psi | 88% | 3028 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 57,203 psi | 90% | 3087 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 56,768 psi | 89% | 3054 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3084 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 54,201 psi | 85% | 2959 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,595 psi | 90% | 3038 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,839 psi | 86% | 2946 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,027 psi | 56% | 1886 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,985 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,636 psi | 86% | 2976 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,377 psi | 90% | 3114 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,000 psi | 89% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,520 psi | 85% | 3071 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,983 psi | 85% | 3097 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 54,737 psi | 86% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,360 psi | 85% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,956 psi | 89% | 3028 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,942 psi | 89% | 3005 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,781 psi | 86% | 2976 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,853 psi | 86% | 2972 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,390 psi | 87% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,695 psi | 87% | 3012 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,911 psi | 86% | 3035 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,550 psi | 89% | 2999 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,956 psi | 89% | 3018 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,405 psi | 87% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,724 psi | 87% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,013 psi | 86% | 2927 fps | 97.5% |
| Somchem S321 | <<locked>> | 82% | 55,303 psi | 87% | 2979 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,636 psi | 86% | 2877 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,130 psi | 88% | 2989 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,058 psi | 89% | 3025 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 3038 fps | 100% |
| Unknown powder | <<locked>> | 96% | 54,824 psi | 86% | 3045 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 84% | 57,246 psi | 90% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,839 psi | 86% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,609 psi | 90% | 2953 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,609 psi | 90% | 2963 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,839 psi | 86% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,332 psi | 87% | 3015 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 57,406 psi | 90% | 3009 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,305 psi | 90% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,680 psi | 87% | 3064 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,859 psi | 69% | 2907 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,681 psi | 89% | 3012 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,085 psi | 86% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,637 psi | 87% | 3071 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,795 psi | 56% | 2822 fps | 98.4% |
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% | 49,342 psi | 77% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,192 psi | 66% | 2720 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,863 psi | 75% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,283 psi | 76% | 2805 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 39,900 psi | 63% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,071 psi | 57% | 2690 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 45,687 psi | 72% | 2835 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,783 psi | 61% | 2674 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,718 psi | 75% | 2841 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,095 psi | 75% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | 57.1 gr | 80% | 41,626 psi | 65% | 2861 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,464 psi | 60% | 2697 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,336 psi | 65% | 2762 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,100 psi | 57% | 2703 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,286 psi | 52% | 2657 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,285 psi | 49% | 2598 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,943 psi | 61% | 2858 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,788 psi | 70% | 2831 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 38,276 psi | 60% | 2700 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,340 psi | 74% | 2838 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,458 psi | 78% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,760 psi | 73% | 2864 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,590 psi | 81% | 3015 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 50,618 psi | 79% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,928 psi | 61% | 2700 fps | 96% |
| Hodgdon H414 | <<locked>> | 88% | 45,136 psi | 71% | 2884 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 94% | 49,574 psi | 78% | 2917 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 46,093 psi | 72% | 2844 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,067 psi | 49% | 2539 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,581 psi | 62% | 2759 fps | 98.8% |
| Hodgdon Superformance | 68.3 gr | 92% | 47,239 psi | 74% | 2943 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 42% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,843 psi | 64% | 2723 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 42,018 psi | 66% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,000 psi | 60% | 2648 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,266 psi | 71% | 2772 fps | 95.4% |
| IMR 4350 | <<locked>> | 94% | 47,427 psi | 74% | 2861 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,992 psi | 72% | 2815 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 35,708 psi | 56% | 2664 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,366 psi | 66% | 2795 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 47,718 psi | 75% | 2841 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 44,918 psi | 70% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,455 psi | 71% | 2762 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 40,640 psi | 64% | 2713 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 40,219 psi | 63% | 2703 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 43,381 psi | 68% | 2789 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,643 psi | 70% | 2782 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,020 psi | 71% | 2792 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,727 psi | 64% | 2749 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 36,318 psi | 57% | 2694 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,321 psi | 63% | 2762 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 43,076 psi | 68% | 2848 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 47,688 psi | 75% | 2844 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,123 psi | 74% | 2864 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,445 psi | 81% | 2890 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 42% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,359 psi | 84% | 2923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,032 psi | 66% | 2743 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,555 psi | 68% | 2871 fps | 98.3% |
| ReloadSwiss RS 60 | 56.2 gr | 80% | 35,404 psi | 55% | 2730 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,723 psi | 56% | 2703 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,435 psi | 60% | 2776 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 48,689 psi | 76% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,438 psi | 67% | 2730 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 35,940 psi | 56% | 2641 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,340 psi | 74% | 2838 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,219 psi | 63% | 2703 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,918 psi | 70% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,640 psi | 64% | 2713 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 43,381 psi | 68% | 2789 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,811 psi | 58% | 2690 fps | 97.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,064 psi | 72% | 2818 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,063 psi | 69% | 2795 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,021 psi | 72% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,363 psi | 60% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,324 psi | 71% | 2759 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,576 psi | 81% | 2923 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,585 psi | 71% | 2733 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,629 psi | 72% | 2815 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 36,695 psi | 57% | 2648 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 26,701 psi | 42% | 2464 fps | 95% |
| Unknown powder | <<locked>> | 84% | 36,840 psi | 58% | 2694 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 50,821 psi | 80% | 2785 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,279 psi | 68% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,119 psi | 66% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,018 psi | 66% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,299 psi | 49% | 2493 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 84% | 36,956 psi | 58% | 2671 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 50,328 psi | 79% | 2897 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,814 psi | 66% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,536 psi | 59% | 2717 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 92% | 33,721 psi | 53% | 2680 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,908 psi | 48% | 2497 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 51,285 psi | 80% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,136 psi | 71% | 2884 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,502 psi | 49% | 2684 fps | 96.2% |
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 WSM loaded with the .308 | 155gr | Berger BT Target. Alliant Reloder-17 delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,146 fps. Alliant Reloder-16 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 (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, 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 Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 155gr | Berger BT Target 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.