Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 200gr | Swift A-Frame bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Accurate High Country.
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 2700 | <<locked>> | 82% | 54,302 psi | 87% | 2602 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,043 psi | 90% | 2700 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 53,838 psi | 86% | 2585 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,534 psi | 87% | 2694 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 53,417 psi | 86% | 2785 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 98% | 54,186 psi | 87% | 2782 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 53,693 psi | 86% | 2615 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,303 psi | 89% | 2736 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 98% | 52,794 psi | 85% | 2730 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,506 psi | 89% | 2736 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,679 psi | 88% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,636 psi | 88% | 2657 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,201 psi | 89% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,391 psi | 90% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,752 psi | 88% | 2726 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2782 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2713 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,658 psi | 73% | 2651 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,620 psi | 84% | 2795 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,908 psi | 82% | 2710 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 55,376 psi | 89% | 2654 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2782 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 54,694 psi | 88% | 2644 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,208 psi | 72% | 2592 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 55,579 psi | 89% | 2671 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,040 psi | 85% | 2690 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 56,289 psi | 90% | 2703 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 96% | 53,055 psi | 85% | 2677 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,434 psi | 89% | 2713 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,535 psi | 89% | 2671 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,614 psi | 72% | 2687 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 88% | 52,721 psi | 85% | 2720 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 59% | 1637 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,200 psi | 85% | 2598 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,608 psi | 89% | 2635 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,666 psi | 89% | 2677 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,246 psi | 90% | 2667 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 54,810 psi | 88% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,101 psi | 90% | 2680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,665 psi | 88% | 2667 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2762 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 53,417 psi | 86% | 2592 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,318 psi | 90% | 2664 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,360 psi | 87% | 2657 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,673 psi | 75% | 2562 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 53,969 psi | 87% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,881 psi | 85% | 2677 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 55,216 psi | 89% | 2808 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 53,200 psi | 85% | 2677 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,781 psi | 88% | 2671 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2776 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 55,477 psi | 89% | 2733 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,675 psi | 78% | 2661 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 60% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,550 psi | 89% | 2657 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,941 psi | 90% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,288 psi | 87% | 2713 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,362 psi | 90% | 2795 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,701 psi | 72% | 2684 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 82% | 55,288 psi | 89% | 2598 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,492 psi | 89% | 2651 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,519 psi | 86% | 2657 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 54,056 psi | 87% | 2717 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 54,694 psi | 88% | 2644 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,318 psi | 90% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 53,417 psi | 86% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,360 psi | 87% | 2657 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,316 psi | 85% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,391 psi | 90% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,014 psi | 90% | 2621 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,592 psi | 86% | 2710 fps | 98.7% |
| Somchem S355 | <<locked>> | 86% | 55,477 psi | 89% | 2644 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,114 psi | 88% | 2654 fps | 97.1% |
| Somchem S365 | <<locked>> | 94% | 56,115 psi | 90% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,665 psi | 88% | 2690 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,825 psi | 90% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,854 psi | 90% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,142 psi | 85% | 2575 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,274 psi | 89% | 2671 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2667 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 53,940 psi | 86% | 2572 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,302 psi | 87% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,158 psi | 88% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,419 psi | 89% | 2799 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,340 psi | 76% | 2657 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,549 psi | 87% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,040 psi | 85% | 2690 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,819 psi | 77% | 2779 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,418 psi | 87% | 2684 fps | 98.6% |
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 2700 | <<locked>> | 80% | 50,720 psi | 81% | 2549 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 30,516 psi | 49% | 2238 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 50,647 psi | 81% | 2539 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,885 psi | 62% | 2434 fps | 99.1% |
| Accurate High Country | 63.9 gr | 90% | 43,294 psi | 69% | 2608 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 94% | 47,050 psi | 75% | 2664 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,587 psi | 76% | 2523 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,943 psi | 64% | 2467 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 46,369 psi | 74% | 2618 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,045 psi | 64% | 2467 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,225 psi | 77% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,445 psi | 82% | 2608 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,594 psi | 60% | 2438 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,685 psi | 68% | 2556 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,624 psi | 64% | 2461 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,856 psi | 64% | 2510 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,702 psi | 44% | 2218 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,328 psi | 50% | 2329 fps | 95.8% |
| Alliant Reloder-26 | 58.5 gr | 80% | 29,457 psi | 47% | 2320 fps | 95.8% |
| Bofors RP15 | <<locked>> | 92% | 39,508 psi | 63% | 2500 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,704 psi | 78% | 2556 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,856 psi | 64% | 2510 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,699 psi | 68% | 2444 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 42,467 psi | 68% | 2536 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,747 psi | 78% | 2566 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 40,698 psi | 65% | 2477 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,656 psi | 70% | 2493 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 46,311 psi | 74% | 2569 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,617 psi | 78% | 2608 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,259 psi | 57% | 2339 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,334 psi | 63% | 2569 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 39,566 psi | 63% | 2487 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 44% | 1467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,082 psi | 80% | 2552 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,185 psi | 84% | 2582 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 38,305 psi | 61% | 2375 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,990 psi | 71% | 2467 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 37,202 psi | 60% | 2385 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 52,794 psi | 85% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,310 psi | 73% | 2513 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 44,295 psi | 71% | 2592 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 50,314 psi | 81% | 2546 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,626 psi | 67% | 2425 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 39,871 psi | 64% | 2408 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 31,894 psi | 51% | 2270 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 50,821 psi | 81% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,248 psi | 65% | 2451 fps | 95.3% |
| Norma MRP | 59.7 gr | 84% | 34,185 psi | 55% | 2408 fps | 95% |
| Norma URP | <<locked>> | 80% | 38,537 psi | 62% | 2425 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,097 psi | 82% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,947 psi | 70% | 2598 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,231 psi | 60% | 2415 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 36,434 psi | 58% | 2425 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,905 psi | 45% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,878 psi | 78% | 2556 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,339 psi | 73% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,580 psi | 62% | 2451 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,217 psi | 60% | 2457 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,303 psi | 58% | 2497 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 52,069 psi | 83% | 2556 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,861 psi | 74% | 2510 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,324 psi | 71% | 2503 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 86% | 38,798 psi | 62% | 2444 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,699 psi | 68% | 2444 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,626 psi | 67% | 2425 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 50,314 psi | 81% | 2546 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,871 psi | 64% | 2408 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,804 psi | 75% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,847 psi | 75% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,712 psi | 65% | 2372 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,435 psi | 62% | 2441 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,035 psi | 74% | 2503 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,298 psi | 77% | 2546 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,041 psi | 56% | 2388 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 36,956 psi | 59% | 2379 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 52,475 psi | 84% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,591 psi | 84% | 2533 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,976 psi | 71% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,958 psi | 64% | 2425 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 90% | 38,841 psi | 62% | 2411 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,618 psi | 81% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,247 psi | 63% | 2425 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 30,676 psi | 49% | 2287 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 92% | 45,368 psi | 73% | 2628 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 44,208 psi | 71% | 2602 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,856 psi | 62% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,698 psi | 65% | 2477 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,424 psi | 39% | 2195 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 38,711 psi | 62% | 2415 fps | 95% |
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 89 powders for .300 H&H Mag. loaded with the .308 | 200gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,808 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 Reloder-26, Norma MRP, Accurate High Country rank at the top here: for .300 H&H Mag. with the .308 | 200gr | 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.