Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 200gr | Speer Grand Slam bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 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.
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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% | 55,637 psi | 89% | 2635 fps | 99.4% |
| Accurate 3100 | <<locked>> | 98% | 54,491 psi | 87% | 2690 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 55,535 psi | 89% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 52,678 psi | 84% | 2674 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,651 psi | 89% | 2828 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 96% | 52,649 psi | 84% | 2766 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 55,158 psi | 88% | 2648 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,548 psi | 86% | 2723 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 54,679 psi | 88% | 2772 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,811 psi | 61% | 2510 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 53,838 psi | 86% | 2720 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,202 psi | 90% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,202 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,592 psi | 86% | 2730 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,723 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,142 psi | 85% | 2713 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,027 psi | 87% | 2769 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2749 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,442 psi | 76% | 2694 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,926 psi | 88% | 2835 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,953 psi | 85% | 2753 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 53,635 psi | 86% | 2638 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,395 psi | 70% | 2618 fps | 96.1% |
| Bofors RP5 | <<locked>> | 98% | 54,027 psi | 87% | 2769 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 56,231 psi | 90% | 2677 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,065 psi | 75% | 2638 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 82% | 53,751 psi | 86% | 2651 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,868 psi | 88% | 2726 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 54,375 psi | 87% | 2687 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 54,810 psi | 88% | 2717 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,766 psi | 86% | 2700 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,809 psi | 86% | 2654 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,557 psi | 75% | 2736 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 88% | 54,897 psi | 88% | 2762 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,753 psi | 59% | 1654 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,520 psi | 87% | 2628 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 53,867 psi | 86% | 2664 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,317 psi | 87% | 2651 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 53,156 psi | 85% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,376 psi | 90% | 2703 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2805 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 55,042 psi | 88% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,650 psi | 88% | 2651 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,101 psi | 90% | 2694 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,559 psi | 78% | 2602 fps | 99.6% |
| Norma 203B | <<locked>> | 82% | 55,521 psi | 89% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,520 psi | 87% | 2713 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 53,693 psi | 86% | 2792 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 55,085 psi | 88% | 2710 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,434 psi | 90% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,779 psi | 85% | 2766 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 53,708 psi | 86% | 2713 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,676 psi | 81% | 2703 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 60% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,417 psi | 86% | 2638 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,070 psi | 87% | 2733 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,333 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,621 psi | 88% | 2776 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,427 psi | 74% | 2730 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 84% | 53,751 psi | 86% | 2635 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,114 psi | 88% | 2690 fps | 98% |
| Rottweil R 905 | <<locked>> | 96% | 56,043 psi | 90% | 2753 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 88% | 56,231 psi | 90% | 2677 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,650 psi | 88% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,042 psi | 88% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,101 psi | 90% | 2694 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,245 psi | 89% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,317 psi | 87% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,143 psi | 87% | 2608 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,564 psi | 89% | 2749 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 53,737 psi | 86% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,258 psi | 85% | 2638 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 54,650 psi | 88% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 52,997 psi | 85% | 2677 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 86% | 54,824 psi | 88% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,345 psi | 86% | 2654 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,825 psi | 90% | 2707 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 55,579 psi | 89% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,999 psi | 90% | 2710 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,751 psi | 86% | 2723 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 53,853 psi | 86% | 2785 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,516 psi | 79% | 2700 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 52,881 psi | 85% | 2625 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,868 psi | 88% | 2726 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2822 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,750 psi | 85% | 2667 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% | 52,243 psi | 84% | 2585 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 31,734 psi | 51% | 2274 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 52,156 psi | 84% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,205 psi | 64% | 2464 fps | 99.4% |
| Accurate High Country | <<locked>> | 88% | 42,076 psi | 67% | 2592 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 94% | 49,037 psi | 79% | 2707 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 48,849 psi | 78% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,667 psi | 62% | 2448 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 92% | 44,947 psi | 72% | 2602 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 35,375 psi | 57% | 2451 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,827 psi | 62% | 2448 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,559 psi | 79% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,808 psi | 85% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,957 psi | 62% | 2477 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,338 psi | 71% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,435 psi | 62% | 2444 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,769 psi | 62% | 2493 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,689 psi | 46% | 2251 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,429 psi | 49% | 2313 fps | 95.6% |
| Alliant Reloder-26 | 60.4 gr | 80% | 30,632 psi | 49% | 2359 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 38,450 psi | 62% | 2484 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 50,038 psi | 80% | 2585 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,625 psi | 65% | 2566 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 38,769 psi | 62% | 2493 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 43,874 psi | 70% | 2474 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 41,046 psi | 66% | 2520 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 50,212 psi | 81% | 2598 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,076 psi | 67% | 2510 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 44,802 psi | 72% | 2526 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 45,020 psi | 72% | 2552 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,137 psi | 76% | 2592 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,521 psi | 59% | 2372 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,290 psi | 61% | 2556 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 40,857 psi | 66% | 2523 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 44% | 1473 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,401 psi | 82% | 2582 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,392 psi | 63% | 2408 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,324 psi | 73% | 2503 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 38,638 psi | 62% | 2421 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,804 psi | 75% | 2552 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 42,859 psi | 69% | 2575 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 51,721 psi | 83% | 2575 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,801 psi | 69% | 2454 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 41,031 psi | 66% | 2441 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 31,111 psi | 50% | 2257 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 52,156 psi | 84% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,015 psi | 63% | 2434 fps | 95.2% |
| Norma MRP | 61.6 gr | 84% | 35,462 psi | 57% | 2448 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,784 psi | 64% | 2457 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 52,779 psi | 85% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,627 psi | 68% | 2582 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 38,667 psi | 62% | 2451 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 92% | 37,797 psi | 61% | 2467 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 45% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,227 psi | 81% | 2589 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,079 psi | 75% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,943 psi | 64% | 2484 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,580 psi | 62% | 2493 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,201 psi | 56% | 2477 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 47,195 psi | 76% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,873 psi | 69% | 2484 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 37,695 psi | 60% | 2428 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 43,874 psi | 70% | 2474 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,801 psi | 69% | 2454 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 51,721 psi | 83% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,031 psi | 66% | 2441 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,472 psi | 78% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,167 psi | 77% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,771 psi | 67% | 2405 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,347 psi | 60% | 2425 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 47,355 psi | 76% | 2533 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,673 psi | 75% | 2530 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 36,361 psi | 58% | 2418 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,955 psi | 58% | 2365 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 45,237 psi | 73% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,176 psi | 66% | 2454 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 37,608 psi | 60% | 2395 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 52,040 psi | 83% | 2556 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,567 psi | 65% | 2457 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 31,908 psi | 51% | 2323 fps | 98.1% |
| Vihtavuori N560 | 66 gr | 90% | 43,947 psi | 70% | 2608 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 43,207 psi | 69% | 2589 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,161 psi | 64% | 2425 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,279 psi | 68% | 2513 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,396 psi | 41% | 2241 fps | 97.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,190 psi | 64% | 2454 fps | 95.8% |
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 86 powders for .300 H&H Mag. loaded with the .308 | 200gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,835 fps. ADI AR 2225 gives the best case fill at 100 %, and 86 of the 86 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 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 H&H Mag. with the .308 | 200gr | Speer Grand Slam 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.