Load Specifications
Load data in caliber .300 H&H Mag. with .306 | 160gr | Peregrine Plainsmaster (VLR-4) 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, Hodgdon Superformance and ReloadSwiss RS 60.
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 2015 | <<locked>> | 82% | 53,708 psi | 86% | 2812 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,912 psi | 90% | 2881 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,056 psi | 87% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,303 psi | 89% | 2890 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,221 psi | 69% | 2776 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 56,028 psi | 90% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 52,721 psi | 85% | 2966 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 84% | 53,113 psi | 85% | 2913 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 54,114 psi | 87% | 2917 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,492 psi | 89% | 2917 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 52,968 psi | 85% | 2841 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,707 psi | 85% | 3031 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,186 psi | 87% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,795 psi | 88% | 2959 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,041 psi | 87% | 3028 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,521 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,118 psi | 66% | 2805 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,485 psi | 75% | 2982 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 52,823 psi | 85% | 2927 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 54,824 psi | 88% | 2953 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,926 psi | 88% | 2927 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,693 psi | 86% | 2848 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,969 psi | 88% | 2946 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,854 psi | 90% | 2969 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 55,738 psi | 89% | 3022 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 56,115 psi | 90% | 2982 fps | 97% |
| Hodgdon H4895 | <<locked>> | 84% | 53,650 psi | 86% | 2927 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,969 psi | 87% | 2953 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,171 psi | 85% | 2956 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,518 psi | 84% | 2999 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 57% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,752 psi | 88% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,592 psi | 86% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,548 psi | 86% | 2897 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,432 psi | 86% | 2877 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 55,405 psi | 89% | 2953 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,301 psi | 85% | 2900 fps | 97.6% |
| IMR 4831 | <<locked>> | 98% | 53,359 psi | 86% | 2959 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 56,231 psi | 90% | 2992 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,492 psi | 89% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,420 psi | 90% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,767 psi | 89% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,519 psi | 86% | 2894 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,202 psi | 90% | 2949 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 53,780 psi | 86% | 2933 fps | 98% |
| Norma 201 | <<locked>> | 86% | 54,868 psi | 88% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,840 psi | 90% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,041 psi | 87% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,144 psi | 90% | 3002 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 46,369 psi | 74% | 2936 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 55,434 psi | 89% | 3012 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 54,795 psi | 88% | 2972 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,273 psi | 87% | 3005 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 55,637 psi | 89% | 2936 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,521 psi | 89% | 2956 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,304 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,057 psi | 90% | 2949 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,361 psi | 89% | 3028 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,969 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 52,562 psi | 84% | 2989 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,825 psi | 90% | 3077 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,695 psi | 89% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,448 psi | 89% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,694 psi | 88% | 2943 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,926 psi | 88% | 2927 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,202 psi | 90% | 2949 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,420 psi | 90% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,519 psi | 86% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,780 psi | 86% | 2933 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,011 psi | 85% | 2953 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,056 psi | 87% | 2913 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,911 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,420 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,534 psi | 86% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 52,953 psi | 85% | 2848 fps | 97.6% |
| Somchem S335 | <<locked>> | 86% | 55,738 psi | 89% | 2841 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,824 psi | 86% | 2904 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 54,926 psi | 88% | 2940 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,882 psi | 86% | 3015 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,719 psi | 80% | 2890 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 56,202 psi | 90% | 2808 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,606 psi | 86% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,463 psi | 89% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,304 psi | 90% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 52,953 psi | 85% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,389 psi | 87% | 2953 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,927 psi | 90% | 2917 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,563 psi | 87% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,388 psi | 86% | 2956 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2887 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,737 psi | 88% | 2933 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,072 psi | 90% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,014 psi | 90% | 3025 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,767 psi | 59% | 2812 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,926 psi | 88% | 2946 fps | 100% |
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 2015 | <<locked>> | 80% | 50,415 psi | 81% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,815 psi | 69% | 2680 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,502 psi | 81% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,211 psi | 77% | 2772 fps | 95.8% |
| Accurate 3100 | <<locked>> | 98% | 40,379 psi | 65% | 2717 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,553 psi | 65% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,461 psi | 55% | 2605 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 46,485 psi | 75% | 2799 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,479 psi | 63% | 2644 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,646 psi | 78% | 2808 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,559 psi | 79% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,714 psi | 68% | 2838 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,378 psi | 63% | 2671 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,119 psi | 68% | 2733 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,635 psi | 56% | 2621 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,982 psi | 54% | 2631 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,878 psi | 48% | 2516 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,275 psi | 60% | 2772 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,137 psi | 74% | 2808 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 38,885 psi | 62% | 2667 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 45,382 psi | 73% | 2756 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,328 psi | 81% | 2795 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,863 psi | 77% | 2831 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,740 psi | 64% | 2674 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 88% | 42,438 psi | 68% | 2779 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 49,414 psi | 79% | 2867 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 46,978 psi | 75% | 2812 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,733 psi | 48% | 2457 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,352 psi | 70% | 2785 fps | 99.6% |
| Hodgdon Superformance | 67.8 gr | 90% | 45,397 psi | 73% | 2864 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 42% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,237 psi | 73% | 2766 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 46,978 psi | 75% | 2805 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,466 psi | 66% | 2677 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,092 psi | 71% | 2707 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 45,890 psi | 74% | 2789 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,280 psi | 71% | 2736 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 33,402 psi | 54% | 2562 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 43,178 psi | 69% | 2762 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 48,646 psi | 78% | 2808 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,934 psi | 74% | 2779 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,485 psi | 75% | 2740 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,495 psi | 67% | 2684 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 38,508 psi | 62% | 2621 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 41,597 psi | 67% | 2707 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 45,542 psi | 73% | 2753 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,050 psi | 74% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,466 psi | 66% | 2720 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 52,359 psi | 84% | 2940 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 43,265 psi | 69% | 2871 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,708 psi | 56% | 2605 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 41,394 psi | 66% | 2736 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 41,495 psi | 67% | 2769 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 48,718 psi | 78% | 2818 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,486 psi | 78% | 2841 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,562 psi | 84% | 2861 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 43% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,147 psi | 64% | 2657 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,860 psi | 72% | 2844 fps | 98.9% |
| ReloadSwiss RS 60 | 57 gr | 80% | 36,216 psi | 58% | 2703 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,287 psi | 55% | 2621 fps | 95% |
| ReloadSwiss RS 70 | 62.2 gr | 86% | 36,651 psi | 59% | 2690 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 49,255 psi | 79% | 2789 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,221 psi | 69% | 2700 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,680 psi | 59% | 2612 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 45,382 psi | 73% | 2756 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,508 psi | 62% | 2621 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,934 psi | 74% | 2779 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,495 psi | 67% | 2684 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 41,597 psi | 67% | 2707 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,753 psi | 61% | 2664 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,036 psi | 75% | 2792 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,107 psi | 72% | 2769 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,833 psi | 75% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,088 psi | 63% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,337 psi | 69% | 2677 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 46,485 psi | 75% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,949 psi | 75% | 2792 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,449 psi | 60% | 2618 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,035 psi | 43% | 2434 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 46,441 psi | 74% | 2831 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,808 psi | 85% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,297 psi | 76% | 2694 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,975 psi | 69% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,671 psi | 70% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,694 psi | 57% | 2556 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 33,968 psi | 54% | 2556 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 48,820 psi | 78% | 2805 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,901 psi | 67% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,752 psi | 57% | 2612 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 32,314 psi | 52% | 2592 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,560 psi | 51% | 2474 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 48,950 psi | 78% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,641 psi | 68% | 2785 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,052 psi | 48% | 2598 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,744 psi | 72% | 2772 fps | 99.5% |
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 .306 | 160gr | Peregrine Plainsmaster (VLR-4). ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,077 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 57–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.306" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .300 H&H Mag. with the .306 | 160gr | Peregrine Plainsmaster (VLR-4) 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.