Load Specifications
Bullet:.308 | 170gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:170 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 WSM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber .300 WSM with .308 | 170gr | Swift A-Frame bullet and 104 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-16 and Hodgdon Superformance.
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% | 54,244 psi | 85% | 2789 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,580 psi | 90% | 2890 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,159 psi | 90% | 2858 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2825 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 54,578 psi | 86% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,868 psi | 86% | 2940 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 57,406 psi | 90% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,085 psi | 86% | 2874 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2976 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,101 psi | 88% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,711 psi | 90% | 2835 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,838 psi | 84% | 2989 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,579 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,941 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,564 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,927 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 2963 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2897 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,977 psi | 72% | 2848 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,219 psi | 63% | 2749 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 3035 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,522 psi | 90% | 2940 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,507 psi | 89% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2897 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 55,912 psi | 88% | 2890 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,363 psi | 90% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,912 psi | 88% | 2897 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,913 psi | 89% | 2927 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,984 psi | 86% | 2956 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 94% | 55,593 psi | 87% | 2923 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 54,505 psi | 85% | 2877 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,680 psi | 87% | 2917 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,636 psi | 86% | 2917 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,696 psi | 90% | 3031 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 56% | 1788 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,549 psi | 85% | 2864 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,174 psi | 90% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,261 psi | 90% | 2897 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,202 psi | 88% | 2871 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,565 psi | 89% | 2920 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,638 psi | 90% | 2920 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 2940 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,406 psi | 90% | 2946 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,101 psi | 88% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,969 psi | 85% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,347 psi | 88% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,723 psi | 86% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,580 psi | 90% | 2917 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,274 psi | 87% | 2904 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,538 psi | 64% | 2667 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 56,057 psi | 88% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,681 psi | 89% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,158 psi | 86% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,624 psi | 90% | 2976 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 51,547 psi | 81% | 2982 fps | 98.3% |
| Norma URP | <<locked>> | 96% | 57,101 psi | 89% | 2976 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,869 psi | 88% | 2930 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,071 psi | 86% | 3005 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 96% | 56,115 psi | 88% | 2979 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,630 psi | 75% | 2851 fps | 96.5% |
| Ramshot TAC | <<locked>> | 82% | 56,289 psi | 88% | 2894 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,202 psi | 88% | 2907 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,130 psi | 90% | 2913 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,753 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,695 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,520 psi | 85% | 2959 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,363 psi | 90% | 3048 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,855 psi | 89% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,594 psi | 89% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,362 psi | 88% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,302 psi | 85% | 2887 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2946 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 55,912 psi | 88% | 2890 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,580 psi | 90% | 2917 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,969 psi | 85% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,723 psi | 86% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,274 psi | 87% | 2904 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,404 psi | 85% | 2913 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,100 psi | 86% | 2871 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,811 psi | 87% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,130 psi | 90% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,288 psi | 85% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,493 psi | 90% | 2867 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2940 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 56,637 psi | 89% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,810 psi | 86% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,347 psi | 88% | 2900 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,999 psi | 88% | 2979 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2923 fps | 98.2% |
| Unknown powder | <<locked>> | 92% | 54,433 psi | 85% | 2930 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 86% | 57,029 psi | 89% | 2772 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,797 psi | 89% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,507 psi | 89% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,491 psi | 85% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,853 psi | 86% | 2900 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,643 psi | 72% | 2753 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 86% | 56,130 psi | 88% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,317 psi | 87% | 2949 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,242 psi | 80% | 2923 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,825 psi | 87% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,984 psi | 86% | 2956 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,191 psi | 65% | 2881 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2949 fps | 97.7% |
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% | 47,732 psi | 75% | 2694 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,751 psi | 84% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,135 psi | 69% | 2638 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 37,144 psi | 58% | 2595 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,165 psi | 71% | 2697 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,837 psi | 53% | 2536 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 50,618 psi | 79% | 2815 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,105 psi | 68% | 2664 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 46,079 psi | 72% | 2799 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,721 psi | 83% | 2815 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,230 psi | 85% | 2789 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,760 psi | 73% | 2867 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,207 psi | 68% | 2690 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,224 psi | 72% | 2756 fps | 99.6% |
| Alliant Reloder-16 | 54.4 gr | 80% | 33,475 psi | 52% | 2546 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,608 psi | 59% | 2674 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,527 psi | 71% | 2792 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,513 psi | 71% | 2838 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,659 psi | 43% | 2405 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,476 psi | 56% | 2631 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,953 psi | 53% | 2641 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,096 psi | 79% | 2825 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,221 psi | 68% | 2697 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,513 psi | 71% | 2838 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 40,857 psi | 64% | 2615 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,969 psi | 85% | 2792 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,228 psi | 82% | 2841 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,772 psi | 69% | 2703 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 80% | 39,001 psi | 61% | 2654 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 45,963 psi | 72% | 2756 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 51,169 psi | 80% | 2825 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,053 psi | 49% | 2448 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,788 psi | 70% | 2756 fps | 100% |
| Hodgdon Superformance | 65.1 gr | 84% | 40,379 psi | 63% | 2713 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 42% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,455 psi | 71% | 2713 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,398 psi | 74% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,250 psi | 66% | 2641 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,611 psi | 65% | 2608 fps | 95.9% |
| IMR 4350 | <<locked>> | 86% | 41,466 psi | 65% | 2651 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,813 psi | 62% | 2592 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 31,749 psi | 50% | 2467 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 47,384 psi | 74% | 2785 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 52,721 psi | 83% | 2815 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,604 psi | 79% | 2792 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,980 psi | 78% | 2743 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,397 psi | 71% | 2700 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,405 psi | 59% | 2546 fps | 96% |
| Lovex S070 | <<locked>> | 82% | 37,956 psi | 59% | 2575 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 35,534 psi | 56% | 2559 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,588 psi | 78% | 2762 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,082 psi | 78% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,571 psi | 71% | 2743 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,804 psi | 73% | 2795 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 41,858 psi | 66% | 2795 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,953 psi | 53% | 2536 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 45,513 psi | 71% | 2759 fps | 99.7% |
| Ramshot Grand | <<locked>> | 98% | 51,126 psi | 80% | 2936 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 84% | 37,608 psi | 59% | 2631 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 44,208 psi | 69% | 2785 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,736 psi | 83% | 2835 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,591 psi | 82% | 2851 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 43% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,845 psi | 69% | 2684 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,472 psi | 78% | 2871 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,001 psi | 63% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,562 psi | 53% | 2552 fps | 95.8% |
| ReloadSwiss RS 70 | 61 gr | 82% | 35,331 psi | 55% | 2612 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 53,650 psi | 84% | 2792 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,210 psi | 74% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,727 psi | 64% | 2644 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,894 psi | 80% | 2831 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 44,425 psi | 70% | 2772 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 40,857 psi | 64% | 2615 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,405 psi | 59% | 2546 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,604 psi | 79% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,397 psi | 71% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,956 psi | 59% | 2575 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,669 psi | 65% | 2694 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,474 psi | 81% | 2815 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,052 psi | 77% | 2782 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,604 psi | 79% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,569 psi | 67% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,030 psi | 61% | 2539 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,005 psi | 69% | 2769 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,270 psi | 79% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,010 psi | 80% | 2802 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,278 psi | 65% | 2644 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,487 psi | 48% | 2490 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 42,308 psi | 66% | 2700 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 36,666 psi | 57% | 2592 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 80% | 47,877 psi | 75% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,224 psi | 74% | 2684 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,818 psi | 73% | 2687 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,273 psi | 55% | 2493 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 36,811 psi | 58% | 2569 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 98% | 42,743 psi | 67% | 2697 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 46,499 psi | 73% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,260 psi | 58% | 2608 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 30,110 psi | 47% | 2480 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,621 psi | 54% | 2507 fps | 98.5% |
| Winchester 760 | <<locked>> | 80% | 39,001 psi | 61% | 2654 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,818 psi | 44% | 2490 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,151 psi | 72% | 2762 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 116 powders for .300 WSM loaded with the .308 | 170gr | Swift A-Frame. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,788 fps to 3,048 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for .300 WSM with the .308 | 170gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H4831 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.