Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 185gr | RWS Evolution bullet and 96 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-26 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>> | 82% | 54,128 psi | 87% | 2651 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,521 psi | 89% | 2720 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2759 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,650 psi | 88% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,259 psi | 89% | 2808 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,766 psi | 86% | 2894 fps | 97.2% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2890 fps | 96% |
| ADI AR 2208 | <<locked>> | 86% | 54,795 psi | 88% | 2736 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,999 psi | 90% | 2848 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,650 psi | 86% | 2838 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,911 psi | 86% | 2851 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,130 psi | 90% | 2844 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,564 psi | 89% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,593 psi | 89% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,985 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,476 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,332 psi | 89% | 2838 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,417 psi | 84% | 2835 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,588 psi | 80% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,192 psi | 69% | 2697 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,953 psi | 85% | 2907 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,080 psi | 77% | 2759 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 56,391 psi | 90% | 2776 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,417 psi | 84% | 2835 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 55,593 psi | 89% | 2759 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 53,171 psi | 85% | 2740 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 53,737 psi | 86% | 2805 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 53,766 psi | 86% | 2766 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 98% | 53,940 psi | 86% | 2789 fps | 96% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,318 psi | 90% | 2825 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,275 psi | 90% | 2789 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,346 psi | 87% | 2772 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,621 psi | 86% | 2838 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,187 psi | 88% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,114 psi | 87% | 2717 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,345 psi | 86% | 2700 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 53,098 psi | 85% | 2740 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,998 psi | 87% | 2736 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 55,492 psi | 89% | 2799 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,751 psi | 86% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,492 psi | 89% | 2776 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2812 fps | 96.2% |
| Lovex S060 | <<locked>> | 82% | 55,724 psi | 89% | 2700 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,505 psi | 87% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,911 psi | 86% | 2733 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 55,259 psi | 89% | 2772 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,816 psi | 70% | 2612 fps | 98.3% |
| Norma 201 | <<locked>> | 82% | 55,637 psi | 89% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,318 psi | 90% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,882 psi | 88% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,606 psi | 86% | 2785 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2923 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 53,969 psi | 87% | 2792 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,637 psi | 89% | 2789 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,430 psi | 82% | 2828 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 56,289 psi | 90% | 2848 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,774 psi | 73% | 2703 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,142 psi | 85% | 2723 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,895 psi | 85% | 2825 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,897 psi | 88% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,447 psi | 86% | 2858 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,032 psi | 67% | 2713 fps | 97% |
| Rottweil R 902 | <<locked>> | 82% | 53,011 psi | 85% | 2674 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,260 psi | 90% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,317 psi | 87% | 2766 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,592 psi | 88% | 2822 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,593 psi | 89% | 2759 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,911 psi | 86% | 2733 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,505 psi | 87% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,259 psi | 89% | 2772 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,433 psi | 87% | 2779 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,419 psi | 89% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,056 psi | 87% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,563 psi | 86% | 2684 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,099 psi | 87% | 2818 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 56,173 psi | 90% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,347 psi | 90% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,912 psi | 90% | 2759 fps | 96.4% |
| Somchem S365 | <<locked>> | 94% | 52,997 psi | 85% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,158 psi | 88% | 2799 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 53,359 psi | 86% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,679 psi | 86% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,998 psi | 87% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,130 psi | 90% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,024 psi | 82% | 2723 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 55,143 psi | 88% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,955 psi | 88% | 2789 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,448 psi | 89% | 2848 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 2910 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,651 psi | 89% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,998 psi | 87% | 2808 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,657 psi | 72% | 2828 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,463 psi | 89% | 2756 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2795 fps | 98.1% |
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% | 50,894 psi | 82% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,689 psi | 78% | 2612 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 32,822 psi | 53% | 2382 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,211 psi | 77% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,637 psi | 59% | 2480 fps | 98% |
| Accurate High Country | <<locked>> | 94% | 46,905 psi | 75% | 2772 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 98% | 51,111 psi | 82% | 2831 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 45,600 psi | 73% | 2589 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 43,178 psi | 69% | 2625 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 50,183 psi | 80% | 2779 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,169 psi | 80% | 2792 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,395 psi | 70% | 2625 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,006 psi | 74% | 2612 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,139 psi | 79% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,737 psi | 57% | 2487 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,480 psi | 65% | 2612 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,888 psi | 69% | 2618 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,120 psi | 69% | 2667 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,252 psi | 42% | 2251 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,576 psi | 54% | 2474 fps | 95.7% |
| Alliant Reloder-26 | 62.3 gr | 84% | 31,995 psi | 51% | 2474 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 42,322 psi | 68% | 2651 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,267 psi | 74% | 2621 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,120 psi | 69% | 2667 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,857 psi | 66% | 2497 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 46,630 psi | 75% | 2631 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,522 psi | 62% | 2523 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,582 psi | 67% | 2546 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 96% | 50,444 psi | 81% | 2733 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,663 psi | 84% | 2769 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,330 psi | 53% | 2388 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,691 psi | 81% | 2720 fps | 100% |
| Hodgdon Superformance | 61.2 gr | 80% | 37,521 psi | 60% | 2533 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 44% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,779 psi | 83% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,964 psi | 77% | 2621 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,067 psi | 80% | 2648 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 38,928 psi | 62% | 2480 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,134 psi | 68% | 2526 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,201 psi | 56% | 2434 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 50,386 psi | 81% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,110 psi | 79% | 2674 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 47,877 psi | 77% | 2753 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 52,562 psi | 84% | 2657 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,124 psi | 77% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,740 psi | 64% | 2480 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 37,985 psi | 61% | 2461 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 33,968 psi | 54% | 2408 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,431 psi | 84% | 2674 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,055 psi | 85% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,486 psi | 78% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,947 psi | 70% | 2618 fps | 95.5% |
| Norma MRP | <<locked>> | 88% | 36,854 psi | 59% | 2562 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,521 psi | 59% | 2477 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,718 psi | 78% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,950 psi | 77% | 2762 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,360 psi | 57% | 2461 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 39,639 psi | 64% | 2582 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 45% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,630 psi | 75% | 2615 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,004 psi | 69% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,260 psi | 58% | 2493 fps | 97.6% |
| ReloadSwiss RS 70 | 58.8 gr | 80% | 35,404 psi | 57% | 2500 fps | 96.9% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,349 psi | 63% | 2651 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 49,937 psi | 80% | 2628 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,569 psi | 70% | 2569 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,906 psi | 77% | 2661 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 41,858 psi | 67% | 2602 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 40,857 psi | 66% | 2497 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,740 psi | 64% | 2480 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 48,124 psi | 77% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,985 psi | 61% | 2461 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,643 psi | 72% | 2621 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,025 psi | 83% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,962 psi | 72% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,870 psi | 62% | 2425 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,466 psi | 66% | 2595 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 53,011 psi | 85% | 2608 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,932 psi | 70% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,518 psi | 84% | 2707 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 32,967 psi | 53% | 2434 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,943 psi | 64% | 2533 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 50,169 psi | 80% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,343 psi | 81% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,916 psi | 67% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,869 psi | 61% | 2477 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 39,233 psi | 63% | 2510 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,631 psi | 78% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,362 psi | 60% | 2477 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,718 psi | 46% | 2326 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 96% | 48,979 psi | 79% | 2789 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,014 psi | 59% | 2448 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 38,696 psi | 62% | 2526 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,656 psi | 40% | 2270 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,054 psi | 83% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,974 psi | 67% | 2569 fps | 95.1% |
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 96 powders for .300 H&H Mag. loaded with the .308 | 185gr | RWS Evolution. Norma MRP delivers the highest muzzle velocity at 2,923 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,923 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 185.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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-26, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 185gr | RWS Evolution 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.