Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 186gr | Peregrine Backup (VRG-2) bullet and 97 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 53,548 psi | 86% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,347 psi | 89% | 2723 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,431 psi | 84% | 2756 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 53,882 psi | 86% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,839 psi | 88% | 2808 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,882 psi | 86% | 2897 fps | 97.4% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2894 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 54,549 psi | 87% | 2736 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,043 psi | 90% | 2854 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2848 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,635 psi | 86% | 2851 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,144 psi | 90% | 2848 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,216 psi | 89% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,521 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,912 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,330 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,347 psi | 89% | 2838 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2841 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,501 psi | 79% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,946 psi | 69% | 2697 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,779 psi | 85% | 2907 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,906 psi | 77% | 2759 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 56,072 psi | 90% | 2776 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2841 fps | 98.1% |
| Bofors RP7 | <<locked>> | 90% | 55,376 psi | 89% | 2759 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 56,434 psi | 90% | 2789 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,534 psi | 86% | 2805 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 53,679 psi | 86% | 2769 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 98% | 53,896 psi | 86% | 2792 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,591 psi | 84% | 2772 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,057 psi | 90% | 2789 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,302 psi | 87% | 2776 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,563 psi | 86% | 2838 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,984 psi | 88% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,114 psi | 87% | 2720 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,330 psi | 86% | 2703 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 56,391 psi | 90% | 2792 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,954 psi | 87% | 2740 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 55,419 psi | 89% | 2802 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,417 psi | 86% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,492 psi | 89% | 2782 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2815 fps | 96.4% |
| Lovex S060 | <<locked>> | 82% | 55,550 psi | 89% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,085 psi | 87% | 2710 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,635 psi | 86% | 2730 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 54,940 psi | 88% | 2772 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,424 psi | 70% | 2608 fps | 98.3% |
| Norma 201 | <<locked>> | 82% | 55,463 psi | 89% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,275 psi | 90% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,766 psi | 88% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,635 psi | 86% | 2792 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 55,651 psi | 89% | 2923 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 53,722 psi | 86% | 2792 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,564 psi | 89% | 2792 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,227 psi | 82% | 2828 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 56,043 psi | 90% | 2848 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2703 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,796 psi | 59% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,420 psi | 90% | 2776 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,808 psi | 85% | 2825 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,824 psi | 88% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,417 psi | 86% | 2858 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,785 psi | 67% | 2713 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 84% | 56,057 psi | 90% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,970 psi | 90% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,389 psi | 87% | 2772 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 98% | 54,534 psi | 87% | 2828 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 55,376 psi | 89% | 2759 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,635 psi | 86% | 2730 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,085 psi | 87% | 2710 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,940 psi | 88% | 2772 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,317 psi | 87% | 2779 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,376 psi | 89% | 2753 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,391 psi | 90% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,809 psi | 86% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,243 psi | 85% | 2687 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,056 psi | 87% | 2822 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 56,043 psi | 90% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,144 psi | 90% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,014 psi | 90% | 2766 fps | 96.6% |
| Somchem S365 | <<locked>> | 94% | 52,779 psi | 85% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,940 psi | 88% | 2799 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 53,098 psi | 85% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,403 psi | 86% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,809 psi | 86% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,941 psi | 90% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,850 psi | 82% | 2723 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 54,984 psi | 88% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,911 psi | 88% | 2792 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2848 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,028 psi | 90% | 2913 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,637 psi | 89% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,766 psi | 86% | 2808 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,570 psi | 71% | 2828 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,376 psi | 89% | 2759 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2799 fps | 98.3% |
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% | 50,053 psi | 80% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,298 psi | 77% | 2612 fps | 97.8% |
| Accurate 3100 | <<locked>> | 88% | 34,548 psi | 55% | 2428 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,456 psi | 76% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,998 psi | 58% | 2470 fps | 98% |
| Accurate High Country | <<locked>> | 94% | 46,775 psi | 75% | 2772 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 98% | 50,923 psi | 82% | 2831 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 45,382 psi | 73% | 2585 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 43,163 psi | 69% | 2628 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 96% | 46,833 psi | 75% | 2723 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,140 psi | 80% | 2795 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,134 psi | 69% | 2625 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,658 psi | 73% | 2608 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,805 psi | 78% | 2674 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,404 psi | 57% | 2484 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,074 psi | 64% | 2605 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,641 psi | 68% | 2618 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,757 psi | 69% | 2664 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,672 psi | 41% | 2241 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,286 psi | 53% | 2470 fps | 95.8% |
| Alliant Reloder-26 | 63.2 gr | 84% | 31,430 psi | 50% | 2464 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 42,119 psi | 68% | 2648 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 45,716 psi | 73% | 2618 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,757 psi | 69% | 2664 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 40,422 psi | 65% | 2497 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,209 psi | 74% | 2628 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,276 psi | 61% | 2523 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 41,263 psi | 66% | 2543 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 50,386 psi | 81% | 2736 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,168 psi | 79% | 2717 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,924 psi | 53% | 2385 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,633 psi | 81% | 2723 fps | 100% |
| Hodgdon Superformance | 62.1 gr | 80% | 37,188 psi | 60% | 2530 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 43% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,590 psi | 83% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,747 psi | 77% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,821 psi | 80% | 2648 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 38,595 psi | 62% | 2477 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,843 psi | 67% | 2523 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 34,708 psi | 56% | 2428 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 50,053 psi | 80% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,878 psi | 78% | 2674 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 98% | 47,761 psi | 77% | 2756 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 52,402 psi | 84% | 2657 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,747 psi | 77% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,276 psi | 63% | 2474 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 37,463 psi | 60% | 2454 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 33,344 psi | 53% | 2398 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,011 psi | 83% | 2671 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,765 psi | 85% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,138 psi | 77% | 2661 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,700 psi | 70% | 2618 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 36,593 psi | 59% | 2559 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,100 psi | 58% | 2470 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,602 psi | 78% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,776 psi | 77% | 2766 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 34,911 psi | 56% | 2457 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 39,247 psi | 63% | 2575 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 44% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,441 psi | 74% | 2615 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,641 psi | 68% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,882 psi | 58% | 2490 fps | 97.7% |
| ReloadSwiss RS 70 | 59.7 gr | 80% | 35,070 psi | 56% | 2497 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,899 psi | 62% | 2644 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 49,487 psi | 79% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,033 psi | 69% | 2566 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,688 psi | 76% | 2661 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 90% | 41,568 psi | 67% | 2598 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,422 psi | 65% | 2497 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,276 psi | 63% | 2474 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 47,747 psi | 77% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,463 psi | 60% | 2454 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,280 psi | 71% | 2618 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,750 psi | 83% | 2700 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,055 psi | 85% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,759 psi | 72% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,363 psi | 62% | 2421 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,176 psi | 66% | 2592 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 52,663 psi | 84% | 2605 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,497 psi | 70% | 2566 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,907 psi | 78% | 2651 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,474 psi | 52% | 2428 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,523 psi | 63% | 2530 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 49,893 psi | 80% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,082 psi | 80% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,524 psi | 67% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,478 psi | 60% | 2474 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 38,870 psi | 62% | 2507 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,240 psi | 77% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,854 psi | 59% | 2470 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,108 psi | 45% | 2313 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 48,834 psi | 78% | 2792 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,767 psi | 59% | 2448 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 38,276 psi | 61% | 2523 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,701 psi | 41% | 2320 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,706 psi | 83% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,814 psi | 67% | 2572 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 97 powders for .300 H&H Mag. loaded with the .308 | 186gr | Peregrine Backup (VRG-2). Norma MRP delivers the highest muzzle velocity at 2,923 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,923 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 186.0 gr projectile in 0.308" calls for a 1:13.5 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 | 186gr | Peregrine Backup (VRG-2) 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.