Load Specifications
Load data in caliber .300 WSM with .308 | 150gr | Swift A-Frame 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, 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 2015 | <<locked>> | 84% | 56,681 psi | 89% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,767 psi | 87% | 2986 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,709 psi | 87% | 3038 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,637 psi | 87% | 2982 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 55,564 psi | 87% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,622 psi | 87% | 3117 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 55,825 psi | 87% | 3068 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,869 psi | 89% | 3064 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,665 psi | 86% | 3012 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,709 psi | 87% | 2992 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,666 psi | 87% | 3189 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,927 psi | 89% | 3087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,624 psi | 90% | 3114 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3179 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,273 psi | 85% | 3156 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,669 psi | 64% | 2890 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,701 psi | 72% | 3064 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,593 psi | 87% | 3077 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 54,273 psi | 85% | 3051 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,638 psi | 90% | 3071 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,260 psi | 88% | 2995 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,157 psi | 85% | 3041 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,318 psi | 88% | 3150 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,491 psi | 85% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,984 psi | 86% | 3061 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 56,376 psi | 88% | 3140 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 56,927 psi | 89% | 3100 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 56,376 psi | 88% | 3077 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,098 psi | 83% | 3045 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,970 psi | 88% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,521 psi | 87% | 3146 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 56% | 1890 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,318 psi | 88% | 3058 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,882 psi | 86% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,405 psi | 87% | 3031 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,984 psi | 86% | 3005 fps | 97.5% |
| IMR 4350 | <<locked>> | 98% | 54,636 psi | 86% | 3041 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,144 psi | 88% | 3048 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 3005 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 55,448 psi | 87% | 3087 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,665 psi | 86% | 3012 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,709 psi | 87% | 3038 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,245 psi | 87% | 2989 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 56,260 psi | 88% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,492 psi | 87% | 3041 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 56,550 psi | 89% | 3081 fps | 98% |
| Norma 201 | <<locked>> | 86% | 54,505 psi | 85% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,027 psi | 86% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,826 psi | 89% | 3097 fps | 100% |
| Norma URP | <<locked>> | 98% | 54,592 psi | 86% | 3104 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 90% | 57,696 psi | 90% | 3127 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,145 psi | 90% | 3156 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 55,071 psi | 86% | 3031 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,636 psi | 86% | 3048 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,608 psi | 87% | 3015 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 57% | 1936 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,537 psi | 90% | 3045 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,361 psi | 87% | 3041 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,375 psi | 85% | 3123 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,128 psi | 85% | 3159 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,448 psi | 87% | 3140 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,969 psi | 86% | 3169 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 84% | 55,448 psi | 87% | 2992 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,100 psi | 86% | 3005 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,580 psi | 90% | 3094 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,638 psi | 90% | 3071 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,492 psi | 87% | 3041 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,709 psi | 87% | 3038 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,260 psi | 88% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,550 psi | 89% | 3081 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,680 psi | 87% | 3104 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,159 psi | 90% | 3064 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,114 psi | 85% | 3031 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,782 psi | 87% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,275 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,883 psi | 88% | 2992 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 55,869 psi | 88% | 3045 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,347 psi | 87% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,695 psi | 89% | 3054 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,725 psi | 90% | 3091 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 3104 fps | 100% |
| Unknown powder | <<locked>> | 96% | 55,506 psi | 87% | 3110 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 82% | 54,491 psi | 85% | 2894 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,535 psi | 87% | 2927 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,926 psi | 86% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,853 psi | 86% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,666 psi | 87% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,173 psi | 88% | 3081 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 54,244 psi | 85% | 3018 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,433 psi | 85% | 3002 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,507 psi | 89% | 3133 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,933 psi | 70% | 2976 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,566 psi | 90% | 3077 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,709 psi | 87% | 3071 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,376 psi | 88% | 3140 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,521 psi | 57% | 2890 fps | 98.5% |
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 2015 | <<locked>> | 80% | 49,995 psi | 78% | 2864 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,743 psi | 67% | 2779 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,385 psi | 76% | 2927 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,776 psi | 76% | 2864 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 40,437 psi | 63% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,695 psi | 57% | 2753 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 46,079 psi | 72% | 2894 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 39,247 psi | 62% | 2733 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,153 psi | 75% | 2904 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,733 psi | 76% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | 59.2 gr | 80% | 42,018 psi | 66% | 2923 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,957 psi | 61% | 2756 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,785 psi | 65% | 2825 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,463 psi | 57% | 2762 fps | 95.7% |
| Alliant Reloder-17 | 58.3 gr | 80% | 33,634 psi | 53% | 2713 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,734 psi | 50% | 2657 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,028 psi | 58% | 2854 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,571 psi | 71% | 2900 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 38,696 psi | 61% | 2759 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,790 psi | 75% | 2897 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,893 psi | 78% | 2894 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,195 psi | 74% | 2923 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,257 psi | 82% | 3081 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,227 psi | 80% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,436 psi | 62% | 2759 fps | 96% |
| Hodgdon H414 | <<locked>> | 88% | 45,905 psi | 72% | 2949 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 94% | 50,140 psi | 79% | 2982 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,499 psi | 73% | 2907 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,546 psi | 49% | 2598 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,147 psi | 63% | 2818 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 92% | 47,950 psi | 75% | 3012 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,411 psi | 41% | 1690 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,365 psi | 65% | 2785 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 42,554 psi | 67% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,363 psi | 60% | 2707 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,948 psi | 72% | 2838 fps | 95.4% |
| IMR 4350 | <<locked>> | 94% | 48,109 psi | 75% | 2927 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,746 psi | 73% | 2881 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 36,303 psi | 57% | 2726 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,801 psi | 67% | 2858 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 48,153 psi | 75% | 2904 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 45,484 psi | 71% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,948 psi | 72% | 2828 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 41,147 psi | 64% | 2776 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 40,814 psi | 64% | 2762 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 43,990 psi | 69% | 2851 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 45,136 psi | 71% | 2844 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,513 psi | 71% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,162 psi | 65% | 2812 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 36,724 psi | 58% | 2749 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,785 psi | 64% | 2822 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 40,988 psi | 64% | 2851 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,225 psi | 76% | 2907 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,761 psi | 75% | 2930 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,069 psi | 82% | 2956 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 42% | 1732 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,940 psi | 85% | 2989 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,554 psi | 67% | 2802 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,135 psi | 69% | 2936 fps | 98.4% |
| ReloadSwiss RS 60 | 58.3 gr | 80% | 35,810 psi | 56% | 2789 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,477 psi | 57% | 2769 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,986 psi | 61% | 2838 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,066 psi | 77% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,946 psi | 67% | 2792 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 36,376 psi | 57% | 2697 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,790 psi | 75% | 2897 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,814 psi | 64% | 2762 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,484 psi | 71% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,147 psi | 64% | 2776 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 43,990 psi | 69% | 2851 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,333 psi | 59% | 2749 fps | 97.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,659 psi | 73% | 2884 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,556 psi | 70% | 2858 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,427 psi | 73% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,711 psi | 61% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,890 psi | 72% | 2822 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,446 psi | 82% | 2992 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,050 psi | 72% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,383 psi | 73% | 2881 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 37,159 psi | 58% | 2703 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 27,050 psi | 42% | 2516 fps | 95% |
| Unknown powder | <<locked>> | 84% | 37,449 psi | 59% | 2756 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,314 psi | 80% | 2848 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,758 psi | 69% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,569 psi | 67% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,496 psi | 67% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,792 psi | 50% | 2552 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 84% | 37,507 psi | 59% | 2730 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 50,792 psi | 80% | 2959 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,192 psi | 66% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 38,087 psi | 60% | 2776 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 92% | 34,301 psi | 54% | 2740 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,430 psi | 49% | 2556 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 52,170 psi | 82% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,905 psi | 72% | 2949 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,995 psi | 50% | 2746 fps | 96.3% |
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 WSM loaded with the .308 | 150gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,890 fps to 3,189 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 150.0 gr projectile in 0.308" calls for a 1:16.0 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 150gr | Swift A-Frame 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.