Load Specifications
Load data in caliber .300 Weath. Mag. with .306 | 160gr | Peregrine VLR-4 bullet and 99 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>> | 84% | 57,479 psi | 90% | 2956 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,550 psi | 87% | 2979 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3015 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 54,360 psi | 85% | 2963 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,463 psi | 87% | 3071 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,043 psi | 89% | 3048 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,955 psi | 86% | 2999 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,927 psi | 89% | 3120 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3104 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,215 psi | 85% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,622 psi | 87% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,796 psi | 87% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,347 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,911 psi | 84% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,115 psi | 88% | 3104 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 3100 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 3031 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,540 psi | 68% | 2943 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,896 psi | 84% | 3176 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,392 psi | 90% | 3068 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,660 psi | 76% | 3015 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 56,521 psi | 89% | 3038 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 3100 fps | 97.6% |
| Bofors RP7 | <<locked>> | 90% | 55,927 psi | 88% | 3025 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 56,942 psi | 89% | 3058 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,230 psi | 85% | 3068 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 57,682 psi | 90% | 3091 fps | 98.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,145 psi | 90% | 3091 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 82% | 57,711 psi | 90% | 3058 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,724 psi | 89% | 3054 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,723 psi | 86% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,491 psi | 85% | 3104 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 57% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,274 psi | 87% | 3002 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,418 psi | 85% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,101 psi | 89% | 3018 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 57,072 psi | 89% | 3058 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,288 psi | 85% | 2999 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 55,970 psi | 88% | 3061 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,290 psi | 90% | 3077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,304 psi | 88% | 3041 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 57,551 psi | 90% | 3015 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,985 psi | 88% | 2969 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,375 psi | 85% | 2972 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,609 psi | 90% | 3045 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,434 psi | 87% | 3035 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,135 psi | 69% | 2851 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 55,608 psi | 87% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,565 psi | 89% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,085 psi | 86% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,244 psi | 85% | 3051 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3192 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 54,259 psi | 85% | 3058 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 56,144 psi | 88% | 3058 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3091 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 94% | 56,797 psi | 89% | 3114 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,427 psi | 73% | 2953 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 58% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,985 psi | 89% | 3045 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,101 psi | 89% | 3120 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,377 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,506 psi | 87% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,186 psi | 85% | 3123 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,569 psi | 67% | 2956 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,246 psi | 88% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,623 psi | 89% | 3038 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,824 psi | 86% | 3028 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 55,245 psi | 87% | 3087 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 55,927 psi | 88% | 3025 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,609 psi | 90% | 3045 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,551 psi | 90% | 3015 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,375 psi | 85% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,434 psi | 87% | 3035 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,810 psi | 86% | 3045 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,753 psi | 87% | 3018 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,594 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,624 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,580 psi | 90% | 2999 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,752 psi | 86% | 3084 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 56,173 psi | 88% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,463 psi | 88% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,782 psi | 89% | 3022 fps | 96.1% |
| Somchem S365 | <<locked>> | 96% | 57,479 psi | 90% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,753 psi | 87% | 3061 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 57,159 psi | 90% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,768 psi | 89% | 2946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,159 psi | 90% | 2963 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,418 psi | 85% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,492 psi | 89% | 3054 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 2976 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 55,376 psi | 87% | 2959 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,550 psi | 87% | 3058 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 3114 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 3179 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,449 psi | 88% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,447 psi | 85% | 3071 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,382 psi | 71% | 3087 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,898 psi | 88% | 3025 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 3061 fps | 97.9% |
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% | 50,372 psi | 79% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,617 psi | 76% | 2858 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 34,882 psi | 55% | 2648 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 47,790 psi | 75% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,172 psi | 57% | 2697 fps | 97.2% |
| ADI AR 2206H | <<locked>> | 80% | 53,476 psi | 84% | 2989 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,556 psi | 71% | 2835 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,456 psi | 73% | 2930 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 50,749 psi | 80% | 3038 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,415 psi | 79% | 3058 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,832 psi | 72% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,965 psi | 77% | 2930 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,650 psi | 56% | 2717 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,538 psi | 64% | 2851 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,977 psi | 72% | 2920 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,323 psi | 68% | 2907 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,572 psi | 43% | 2500 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,839 psi | 56% | 2753 fps | 95.9% |
| Alliant Reloder-26 | 72 gr | 84% | 31,908 psi | 50% | 2687 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,606 psi | 84% | 3009 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 45,498 psi | 71% | 2953 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 45,948 psi | 72% | 2864 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,323 psi | 68% | 2907 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 40,611 psi | 64% | 2730 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,470 psi | 73% | 2877 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 38,479 psi | 60% | 2753 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 44,280 psi | 69% | 2841 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,345 psi | 84% | 3028 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 54,114 psi | 85% | 3002 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,098 psi | 52% | 2605 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,995 psi | 80% | 2982 fps | 100% |
| Hodgdon Superformance | 72.4 gr | 82% | 40,321 psi | 63% | 2825 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,808 psi | 81% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,892 psi | 75% | 2874 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,227 psi | 79% | 2904 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 41,481 psi | 65% | 2769 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,148 psi | 66% | 2762 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 34,911 psi | 55% | 2651 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 50,256 psi | 79% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,779 psi | 83% | 2982 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 80% | 53,882 psi | 84% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,518 psi | 82% | 2917 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,892 psi | 75% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,523 psi | 62% | 2710 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,739 psi | 59% | 2684 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 35,984 psi | 56% | 2671 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,301 psi | 82% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,982 psi | 83% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,298 psi | 76% | 2913 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,224 psi | 74% | 2923 fps | 95.8% |
| Norma MRP | <<locked>> | 90% | 39,639 psi | 62% | 2854 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 36,361 psi | 57% | 2703 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 48,863 psi | 77% | 2940 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 48,443 psi | 76% | 3018 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 82% | 37,797 psi | 59% | 2746 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 98% | 42,989 psi | 67% | 2881 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 43% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,615 psi | 73% | 2861 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,127 psi | 83% | 3054 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,149 psi | 68% | 2917 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,143 psi | 57% | 2717 fps | 96.9% |
| ReloadSwiss RS 70 | 67.9 gr | 80% | 35,273 psi | 55% | 2723 fps | 96.1% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,581 psi | 62% | 2881 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,777 psi | 78% | 2884 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,352 psi | 68% | 2812 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,314 psi | 80% | 2966 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 92% | 44,918 psi | 70% | 2900 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 40,611 psi | 64% | 2730 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,523 psi | 62% | 2710 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,882 psi | 84% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,892 psi | 75% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,739 psi | 59% | 2684 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,614 psi | 70% | 2864 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,083 psi | 82% | 2959 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,171 psi | 83% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,860 psi | 70% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,624 psi | 61% | 2648 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,512 psi | 70% | 2894 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,910 psi | 83% | 2864 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,729 psi | 69% | 2812 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 53,040 psi | 83% | 2959 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 32,677 psi | 51% | 2651 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 42,685 psi | 67% | 2822 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 53,766 psi | 84% | 2851 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,009 psi | 78% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,386 psi | 79% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,814 psi | 66% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,637 psi | 59% | 2700 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 94% | 42,061 psi | 66% | 2795 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,515 psi | 76% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,101 psi | 58% | 2700 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 30,443 psi | 48% | 2582 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 53,258 psi | 83% | 3114 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,985 psi | 58% | 2674 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,624 psi | 61% | 2756 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,847 psi | 44% | 2595 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,156 psi | 82% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,353 psi | 71% | 2867 fps | 95.4% |
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 108 powders for .300 Weath. Mag. loaded with the .306 | 160gr | Peregrine VLR-4. Norma MRP delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,192 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, 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, 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 Weath. Mag. with the .306 | 160gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.