Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | Frontier PH HPBT bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and ReloadSwiss RS 70.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 57,653 psi | 90% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,056 psi | 86% | 2933 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3041 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 54,592 psi | 86% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,753 psi | 87% | 3035 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,927 psi | 88% | 3123 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 54,418 psi | 85% | 2949 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,579 psi | 89% | 3077 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 54,215 psi | 85% | 3068 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,725 psi | 90% | 3133 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,666 psi | 89% | 3074 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,390 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,564 psi | 87% | 2999 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,260 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,853 psi | 84% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,898 psi | 88% | 3061 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3123 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,905 psi | 74% | 2979 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,520 psi | 85% | 3140 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3045 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 56,231 psi | 88% | 2989 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3123 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 55,477 psi | 87% | 2976 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 56,623 psi | 89% | 3012 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,056 psi | 85% | 3025 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 57,159 psi | 90% | 3041 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 54,418 psi | 85% | 3012 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,927 psi | 89% | 3054 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,681 psi | 89% | 3009 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,977 psi | 72% | 3012 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 88% | 54,273 psi | 85% | 3061 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 57% | 1886 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,276 psi | 90% | 2986 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,202 psi | 88% | 2969 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 56,753 psi | 89% | 3012 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,145 psi | 90% | 3005 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 56,057 psi | 88% | 3025 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,985 psi | 89% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,854 psi | 88% | 2999 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3104 fps | 97.2% |
| Lovex S062 | <<locked>> | 84% | 57,725 psi | 90% | 2982 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,406 psi | 90% | 3002 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 55,390 psi | 87% | 2995 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,921 psi | 75% | 2884 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 54,853 psi | 86% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,696 psi | 90% | 3071 fps | 98.4% |
| Norma MRP | <<locked>> | 98% | 57,043 psi | 89% | 3156 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 54,317 psi | 85% | 3015 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,622 psi | 87% | 3009 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3123 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,681 psi | 89% | 3071 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2992 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,260 psi | 58% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,318 psi | 88% | 2992 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,203 psi | 90% | 3104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,724 psi | 87% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,911 psi | 84% | 3081 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 3005 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,028 psi | 88% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,536 psi | 89% | 2992 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,491 psi | 85% | 2986 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 55,201 psi | 87% | 3048 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 55,477 psi | 87% | 2976 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,406 psi | 90% | 3002 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 57,725 psi | 90% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,390 psi | 87% | 2995 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,331 psi | 85% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,942 psi | 89% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,029 psi | 89% | 2956 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,737 psi | 86% | 3045 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 56,246 psi | 88% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,405 psi | 88% | 2982 fps | 96.5% |
| Somchem S365 | <<locked>> | 94% | 57,653 psi | 90% | 3071 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,985 psi | 88% | 3025 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 56,550 psi | 89% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,753 psi | 89% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,682 psi | 90% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,362 psi | 88% | 3012 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 3002 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 54,810 psi | 86% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,593 psi | 87% | 3015 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,739 psi | 89% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,130 psi | 90% | 3143 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,956 psi | 88% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,288 psi | 85% | 3028 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,922 psi | 78% | 3120 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,217 psi | 88% | 3022 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% | 54,244 psi | 85% | 2864 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,532 psi | 81% | 2874 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 35,694 psi | 56% | 2628 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 51,401 psi | 81% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,537 psi | 62% | 2733 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 96% | 52,127 psi | 82% | 3058 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 48,138 psi | 75% | 2844 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 43,540 psi | 68% | 2831 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 50,749 psi | 80% | 3005 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,795 psi | 84% | 3074 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,584 psi | 68% | 2828 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,820 psi | 77% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,127 psi | 82% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,232 psi | 60% | 2743 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,482 psi | 68% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 43,091 psi | 68% | 2822 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,700 psi | 68% | 2877 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,181 psi | 44% | 2484 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,084 psi | 53% | 2671 fps | 95.7% |
| Alliant Reloder-26 | 71.4 gr | 82% | 32,460 psi | 51% | 2667 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 43,091 psi | 68% | 2864 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,385 psi | 77% | 2884 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,700 psi | 68% | 2877 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,236 psi | 68% | 2749 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,632 psi | 78% | 2894 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 41,423 psi | 65% | 2782 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 44,208 psi | 69% | 2802 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 50,705 psi | 79% | 2946 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,661 psi | 78% | 2927 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,853 psi | 56% | 2631 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 98% | 43,120 psi | 68% | 2946 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 40,335 psi | 63% | 2789 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 43% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,662 psi | 79% | 2881 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,808 psi | 83% | 2910 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 38,769 psi | 61% | 2671 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,599 psi | 70% | 2779 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 37,782 psi | 59% | 2680 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 53,490 psi | 84% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,298 psi | 77% | 2887 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 48,501 psi | 76% | 2972 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 50,908 psi | 80% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,206 psi | 66% | 2730 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 40,437 psi | 63% | 2707 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 34,664 psi | 54% | 2602 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 51,488 psi | 81% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,932 psi | 69% | 2818 fps | 95.3% |
| Norma MRP | 72.7 gr | 86% | 37,463 psi | 59% | 2762 fps | 95% |
| Norma URP | <<locked>> | 80% | 39,160 psi | 61% | 2726 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 52,025 psi | 82% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 48,457 psi | 76% | 2982 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,985 psi | 60% | 2710 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 40,205 psi | 63% | 2785 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 44% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,588 psi | 78% | 2877 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,180 psi | 72% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,334 psi | 62% | 2753 fps | 98.2% |
| ReloadSwiss RS 70 | 69 gr | 80% | 37,971 psi | 60% | 2756 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,958 psi | 63% | 2861 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,634 psi | 82% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,543 psi | 73% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,950 psi | 75% | 2867 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 42,337 psi | 66% | 2805 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,236 psi | 68% | 2749 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,206 psi | 66% | 2730 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 50,908 psi | 80% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,437 psi | 63% | 2707 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,659 psi | 75% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,500 psi | 74% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,234 psi | 65% | 2671 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,959 psi | 66% | 2802 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,702 psi | 73% | 2825 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,649 psi | 83% | 2917 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 35,607 psi | 56% | 2680 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 40,306 psi | 63% | 2730 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 53,185 psi | 83% | 2851 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,272 psi | 83% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,643 psi | 70% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,567 psi | 64% | 2726 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 42,409 psi | 66% | 2766 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,503 psi | 81% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,045 psi | 63% | 2726 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,212 psi | 49% | 2566 fps | 96.5% |
| Vihtavuori N560 | <<locked>> | 94% | 49,690 psi | 78% | 3012 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,610 psi | 62% | 2694 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 41,423 psi | 65% | 2782 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,643 psi | 42% | 2516 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,366 psi | 66% | 2772 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 88 powders for .300 Weath. Mag. loaded with the .308 | 165gr | Frontier PH HPBT. Norma MRP delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,156 fps. Accurate 3100 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | Frontier PH HPBT 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.