Load Specifications
Load data in caliber .300 WSM with .308 | 180gr | Barnes X BT bullet and 100 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.
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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% | 56,666 psi | 89% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,549 psi | 85% | 2694 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2726 fps | 98.7% |
| Accurate 4064 | <<locked>> | 86% | 56,695 psi | 89% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,086 psi | 88% | 2835 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 54,810 psi | 86% | 2756 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,579 psi | 87% | 2759 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 2854 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,811 psi | 89% | 2749 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,317 psi | 85% | 2874 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,333 psi | 88% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,826 psi | 89% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,028 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,363 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 2848 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2795 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,688 psi | 73% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,147 psi | 64% | 2657 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,779 psi | 83% | 2923 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,317 psi | 85% | 2772 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 57,725 psi | 90% | 2805 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2795 fps | 96.4% |
| Bofors RP7 | <<locked>> | 92% | 56,739 psi | 89% | 2779 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,811 psi | 89% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,534 psi | 85% | 2766 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 90% | 55,405 psi | 87% | 2841 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 94% | 56,043 psi | 88% | 2808 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 55,405 psi | 87% | 2766 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,246 psi | 88% | 2805 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,376 psi | 87% | 2805 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,070 psi | 85% | 2854 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 57% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,274 psi | 87% | 2753 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,636 psi | 86% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,607 psi | 86% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,869 psi | 89% | 2756 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,942 psi | 89% | 2802 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,723 psi | 86% | 2749 fps | 98.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 2828 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,839 psi | 86% | 2782 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,811 psi | 89% | 2749 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,347 psi | 87% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,116 psi | 90% | 2730 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,825 psi | 87% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,071 psi | 86% | 2756 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 56,144 psi | 88% | 2792 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,119 psi | 66% | 2589 fps | 97.2% |
| Norma 201 | <<locked>> | 84% | 57,319 psi | 90% | 2753 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,653 psi | 90% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,188 psi | 88% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,595 psi | 90% | 2854 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2874 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 54,244 psi | 85% | 2812 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 56,521 psi | 89% | 2818 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,129 psi | 86% | 2884 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 56,231 psi | 88% | 2861 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,312 psi | 76% | 2746 fps | 96.6% |
| Ramshot TAC | <<locked>> | 82% | 56,869 psi | 89% | 2776 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,898 psi | 89% | 2792 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,202 psi | 58% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,682 psi | 90% | 2799 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,334 psi | 90% | 2871 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,768 psi | 89% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,085 psi | 86% | 2848 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,305 psi | 90% | 2927 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,824 psi | 86% | 2710 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,580 psi | 90% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,607 psi | 86% | 2776 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 2831 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 56,739 psi | 89% | 2779 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,071 psi | 86% | 2756 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,347 psi | 87% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,825 psi | 87% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,144 psi | 88% | 2792 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,056 psi | 86% | 2802 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,985 psi | 88% | 2759 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,376 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,737 psi | 86% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,100 psi | 86% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,897 psi | 86% | 2707 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2828 fps | 97.4% |
| Somchem S335 | <<locked>> | 84% | 57,682 psi | 90% | 2680 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,405 psi | 87% | 2746 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,479 psi | 90% | 2792 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,376 psi | 88% | 2867 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2815 fps | 98.3% |
| Unknown powder | <<locked>> | 92% | 54,969 psi | 86% | 2818 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 86% | 57,667 psi | 90% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,694 psi | 86% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,334 psi | 90% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,347 psi | 87% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,405 psi | 87% | 2785 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,485 psi | 73% | 2654 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 86% | 57,145 psi | 90% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,999 psi | 88% | 2838 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 2818 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,898 psi | 88% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,405 psi | 87% | 2841 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,438 psi | 67% | 2792 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,682 psi | 90% | 2835 fps | 97.6% |
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% | 50,227 psi | 79% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,714 psi | 67% | 2493 fps | 95.3% |
| Accurate 3100 | <<locked>> | 90% | 36,579 psi | 57% | 2474 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 47,500 psi | 74% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,984 psi | 56% | 2474 fps | 97.2% |
| ADI AR 2206H | <<locked>> | 80% | 51,837 psi | 81% | 2710 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,135 psi | 69% | 2566 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 46,804 psi | 73% | 2694 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,650 psi | 84% | 2707 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,659 psi | 75% | 2762 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,541 psi | 70% | 2595 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,572 psi | 75% | 2657 fps | 99.7% |
| Alliant Reloder-16 | 49.6 gr | 80% | 34,838 psi | 55% | 2467 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,783 psi | 61% | 2589 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,311 psi | 73% | 2690 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,383 psi | 73% | 2740 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,847 psi | 44% | 2303 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,635 psi | 54% | 2497 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,330 psi | 52% | 2513 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,966 psi | 80% | 2720 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,991 psi | 71% | 2612 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 46,383 psi | 73% | 2740 fps | 95.6% |
| Bofors RP7 | <<locked>> | 82% | 42,438 psi | 67% | 2530 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,476 psi | 84% | 2736 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,353 psi | 71% | 2615 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,263 psi | 63% | 2569 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 44,266 psi | 69% | 2602 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 52,344 psi | 82% | 2720 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,634 psi | 51% | 2379 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,948 psi | 72% | 2657 fps | 100% |
| Hodgdon Superformance | 59.3 gr | 84% | 41,307 psi | 65% | 2618 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 43% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,369 psi | 73% | 2612 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,428 psi | 76% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,395 psi | 68% | 2546 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,859 psi | 67% | 2513 fps | 96.2% |
| IMR 4350 | <<locked>> | 86% | 42,438 psi | 67% | 2556 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,901 psi | 64% | 2500 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 31,575 psi | 49% | 2352 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 48,689 psi | 76% | 2687 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 53,650 psi | 84% | 2707 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,069 psi | 82% | 2690 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,879 psi | 80% | 2638 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,934 psi | 74% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,943 psi | 61% | 2464 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 39,639 psi | 62% | 2497 fps | 95.6% |
| Lovex S071 | <<locked>> | 94% | 35,331 psi | 55% | 2448 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 51,039 psi | 80% | 2661 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,213 psi | 80% | 2657 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,963 psi | 74% | 2648 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,645 psi | 75% | 2694 fps | 95.5% |
| Norma MRP | <<locked>> | 92% | 40,263 psi | 63% | 2644 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,433 psi | 56% | 2461 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 80% | 46,557 psi | 73% | 2664 fps | 99.8% |
| Ramshot Grand | <<locked>> | 98% | 51,532 psi | 81% | 2822 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 82% | 36,492 psi | 57% | 2493 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 45,020 psi | 71% | 2687 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 53,403 psi | 84% | 2723 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,374 psi | 84% | 2740 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 44% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,136 psi | 71% | 2592 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,459 psi | 79% | 2766 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,031 psi | 64% | 2644 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,128 psi | 55% | 2480 fps | 96.6% |
| ReloadSwiss RS 70 | 54.3 gr | 80% | 34,476 psi | 54% | 2477 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,762 psi | 76% | 2615 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,540 psi | 67% | 2559 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 51,517 psi | 81% | 2726 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 45,252 psi | 71% | 2674 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 42,438 psi | 67% | 2530 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,943 psi | 61% | 2464 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,069 psi | 82% | 2690 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,934 psi | 74% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,639 psi | 62% | 2497 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,815 psi | 67% | 2598 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,634 psi | 82% | 2710 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,024 psi | 78% | 2680 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,648 psi | 81% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,671 psi | 68% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,524 psi | 64% | 2457 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,831 psi | 70% | 2667 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,474 psi | 81% | 2595 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,866 psi | 81% | 2694 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,728 psi | 67% | 2556 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 32,242 psi | 51% | 2428 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 40,872 psi | 64% | 2559 fps | 95% |
| Unknown powder | <<locked>> | 80% | 38,087 psi | 60% | 2513 fps | 97% |
| Vihtavuori N133 | <<locked>> | 80% | 48,762 psi | 76% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,631 psi | 76% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,138 psi | 75% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,014 psi | 58% | 2418 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 38,072 psi | 60% | 2487 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 98% | 43,671 psi | 68% | 2602 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 47,645 psi | 75% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,841 psi | 61% | 2533 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 82% | 30,240 psi | 47% | 2379 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,911 psi | 56% | 2431 fps | 98.9% |
| Winchester 760 | <<locked>> | 80% | 40,263 psi | 63% | 2569 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,339 psi | 41% | 2323 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,934 psi | 74% | 2664 fps | 95.4% |
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 112 powders for .300 WSM loaded with the .308 | 180gr | Barnes X BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,927 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,927 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 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 180.0 gr projectile in 0.308" calls for a 1:11.5 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 | 180gr | Barnes X BT 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.