Load Specifications
Bullet Manufacturer:Winchester
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 H&H Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:85.9 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:13.0
Load data in caliber .300 H&H Mag. with .308 | 180gr | Winchester FailSafe bullet and 98 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 Alliant Reloder-26.
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>> | 82% | 53,301 psi | 85% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,491 psi | 87% | 2736 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,735 psi | 83% | 2776 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 53,577 psi | 86% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,896 psi | 86% | 2825 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 52,533 psi | 84% | 2907 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 82% | 56,072 psi | 90% | 2802 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,795 psi | 86% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,042 psi | 88% | 2867 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2854 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,692 psi | 84% | 2871 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,071 psi | 88% | 2864 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,476 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,766 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,737 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,072 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,288 psi | 87% | 2854 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,285 psi | 82% | 2851 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2792 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,337 psi | 68% | 2713 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2982 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,970 psi | 90% | 2822 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,065 psi | 75% | 2776 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 55,201 psi | 89% | 2795 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,285 psi | 82% | 2851 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 54,810 psi | 88% | 2779 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 55,825 psi | 90% | 2815 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 56,275 psi | 90% | 2877 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 56,159 psi | 90% | 2838 fps | 98.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,274 psi | 89% | 2841 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,926 psi | 88% | 2808 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,185 psi | 85% | 2795 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,434 psi | 90% | 2917 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,201 psi | 87% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,374 psi | 86% | 2740 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,086 psi | 90% | 2776 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 55,405 psi | 89% | 2808 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,434 psi | 90% | 2808 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 54,462 psi | 87% | 2822 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,188 psi | 90% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,563 psi | 87% | 2795 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 56,434 psi | 90% | 2776 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,042 psi | 88% | 2730 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,476 psi | 86% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,260 psi | 90% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 54,099 psi | 87% | 2792 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,873 psi | 69% | 2625 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 54,882 psi | 88% | 2746 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,535 psi | 89% | 2743 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,056 psi | 87% | 2789 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,246 psi | 90% | 2861 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2940 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 56,318 psi | 90% | 2867 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,723 psi | 88% | 2812 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,013 psi | 88% | 2864 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2713 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 59% | 1772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,796 psi | 89% | 2799 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,782 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,506 psi | 89% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,795 psi | 86% | 2851 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,985 psi | 90% | 2930 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,492 psi | 89% | 2746 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,332 psi | 89% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,171 psi | 85% | 2782 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 53,490 psi | 86% | 2841 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 54,810 psi | 88% | 2779 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,260 psi | 90% | 2802 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,434 psi | 90% | 2776 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,476 psi | 86% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,099 psi | 87% | 2792 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,258 psi | 85% | 2799 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,607 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,680 psi | 89% | 2677 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,391 psi | 90% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,318 psi | 90% | 2759 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,011 psi | 85% | 2835 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 55,463 psi | 89% | 2677 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,245 psi | 89% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,969 psi | 88% | 2776 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 55,274 psi | 89% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,070 psi | 87% | 2815 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 56,144 psi | 90% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,680 psi | 89% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,188 psi | 90% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,200 psi | 85% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,897 psi | 88% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,980 psi | 80% | 2736 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 54,317 psi | 87% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,012 psi | 87% | 2812 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2867 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2927 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,621 psi | 88% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,275 psi | 90% | 2877 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,627 psi | 70% | 2841 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,636 psi | 88% | 2782 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,172 psi | 87% | 2808 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% | 49,893 psi | 80% | 2628 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,805 psi | 77% | 2628 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 34,389 psi | 55% | 2448 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 47,239 psi | 76% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,737 psi | 57% | 2493 fps | 97.5% |
| Accurate High Country | <<locked>> | 96% | 49,081 psi | 79% | 2844 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 52,620 psi | 84% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,788 psi | 72% | 2605 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,339 psi | 73% | 2697 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 49,255 psi | 79% | 2792 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,066 psi | 79% | 2812 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,252 psi | 73% | 2694 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,107 psi | 72% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,182 psi | 77% | 2697 fps | 99.9% |
| Alliant Reloder-16 | 53.9 gr | 80% | 35,157 psi | 56% | 2503 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,537 psi | 63% | 2628 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,701 psi | 72% | 2687 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,076 psi | 67% | 2677 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,369 psi | 44% | 2316 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,940 psi | 56% | 2536 fps | 95.9% |
| Alliant Reloder-26 | 62.4 gr | 84% | 31,140 psi | 50% | 2477 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,344 psi | 84% | 2766 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 44,092 psi | 71% | 2717 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 45,295 psi | 73% | 2641 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,076 psi | 67% | 2677 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 40,074 psi | 64% | 2513 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 45,701 psi | 73% | 2648 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 37,826 psi | 61% | 2539 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 43,453 psi | 70% | 2615 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,677 psi | 83% | 2782 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,576 psi | 52% | 2402 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,864 psi | 80% | 2743 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,479 psi | 63% | 2605 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,821 psi | 81% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,108 psi | 76% | 2638 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,414 psi | 79% | 2667 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 40,698 psi | 65% | 2549 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,553 psi | 67% | 2543 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 34,563 psi | 55% | 2451 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 49,429 psi | 79% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,227 psi | 82% | 2743 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 52,881 psi | 85% | 2726 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,692 psi | 83% | 2677 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,253 psi | 76% | 2638 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,986 psi | 63% | 2497 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 37,202 psi | 60% | 2474 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 35,433 psi | 57% | 2470 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,517 psi | 83% | 2697 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,083 psi | 84% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,558 psi | 76% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 88% | 45,905 psi | 74% | 2687 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 38,508 psi | 62% | 2631 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,665 psi | 57% | 2490 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,659 psi | 76% | 2703 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 34,548 psi | 55% | 2474 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 41,582 psi | 67% | 2648 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,586 psi | 44% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,716 psi | 73% | 2631 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,895 psi | 83% | 2812 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,032 psi | 67% | 2684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,520 psi | 57% | 2510 fps | 97.1% |
| ReloadSwiss RS 70 | 58.9 gr | 80% | 34,606 psi | 55% | 2510 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 48,994 psi | 79% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,656 psi | 68% | 2589 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 50,082 psi | 80% | 2730 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 43,700 psi | 70% | 2671 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 40,074 psi | 64% | 2513 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,986 psi | 63% | 2497 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,881 psi | 85% | 2726 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,253 psi | 76% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,202 psi | 60% | 2474 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,700 psi | 70% | 2638 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,068 psi | 82% | 2723 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,359 psi | 84% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,193 psi | 71% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,116 psi | 61% | 2438 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,294 psi | 69% | 2664 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,083 psi | 84% | 2631 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,076 psi | 69% | 2589 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 51,401 psi | 82% | 2720 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,126 psi | 52% | 2448 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 38,986 psi | 63% | 2546 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,910 psi | 85% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,197 psi | 79% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,443 psi | 79% | 2631 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,075 psi | 66% | 2520 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,043 psi | 59% | 2490 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 40,901 psi | 66% | 2575 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 47,718 psi | 77% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,521 psi | 59% | 2490 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 27,949 psi | 45% | 2333 fps | 95% |
| Vihtavuori N560 | <<locked>> | 98% | 51,242 psi | 82% | 2861 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,260 psi | 58% | 2464 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,826 psi | 61% | 2539 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,759 psi | 41% | 2339 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,039 psi | 82% | 2726 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,034 psi | 71% | 2638 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 98 powders for .300 H&H Mag. loaded with the .308 | 180gr | Winchester FailSafe. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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, Alliant Reloder-26 rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Winchester FailSafe 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.