Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Nosler Custom Competition bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H4831, Alliant Reloder-26 and Norma MRP.
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% | 57,087 psi | 89% | 2999 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,534 psi | 85% | 3009 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3114 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 57,450 psi | 90% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,056 psi | 86% | 3114 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 57,276 psi | 90% | 3087 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,014 psi | 88% | 3156 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3212 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,174 psi | 90% | 3222 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,766 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,940 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,579 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,101 psi | 89% | 3196 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,332 psi | 87% | 3140 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3202 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 3130 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,412 psi | 73% | 3048 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,592 psi | 84% | 3212 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 3114 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 55,680 psi | 87% | 3074 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3202 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 54,897 psi | 86% | 3054 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 84% | 56,028 psi | 88% | 3091 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 57,014 psi | 89% | 3163 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 56,550 psi | 89% | 3120 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 98% | 57,551 psi | 90% | 3146 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,405 psi | 88% | 3127 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,188 psi | 88% | 3094 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,217 psi | 90% | 3127 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,426 psi | 71% | 3077 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,563 psi | 84% | 3133 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1955 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,566 psi | 90% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,768 psi | 89% | 3071 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,637 psi | 87% | 3048 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 56,043 psi | 88% | 3091 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,521 psi | 89% | 3084 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 55,288 psi | 87% | 3100 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,376 psi | 88% | 3110 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,390 psi | 87% | 3077 fps | 96.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,781 psi | 86% | 3176 fps | 96.5% |
| Lovex S062 | <<locked>> | 84% | 56,913 psi | 89% | 3061 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,710 psi | 89% | 3081 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 54,839 psi | 86% | 3071 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,224 psi | 74% | 2949 fps | 98.4% |
| Norma 203B | <<locked>> | 84% | 57,682 psi | 90% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,174 psi | 90% | 3146 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 56,231 psi | 88% | 3228 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 57,203 psi | 90% | 3150 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,158 psi | 86% | 3091 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,434 psi | 87% | 3196 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 56,173 psi | 88% | 3153 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,603 psi | 78% | 3058 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,246 psi | 58% | 2001 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,883 psi | 88% | 3074 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,420 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,955 psi | 86% | 3133 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,276 psi | 90% | 3222 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,571 psi | 71% | 3071 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,434 psi | 87% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,724 psi | 87% | 3071 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,653 psi | 90% | 3123 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 54,636 psi | 86% | 3127 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 88% | 54,897 psi | 86% | 3054 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,710 psi | 89% | 3081 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 56,913 psi | 89% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,839 psi | 86% | 3071 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,493 psi | 90% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,478 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,391 psi | 88% | 3031 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,157 psi | 85% | 3120 fps | 97.7% |
| Somchem S355 | <<locked>> | 86% | 55,724 psi | 87% | 3068 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,883 psi | 88% | 3054 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 56,898 psi | 89% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,347 psi | 87% | 3100 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 55,767 psi | 87% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,014 psi | 88% | 2995 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,058 psi | 89% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,695 psi | 87% | 3091 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 3071 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 54,389 psi | 85% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,824 psi | 86% | 3091 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 56,072 psi | 88% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,333 psi | 88% | 3215 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,347 psi | 87% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,232 psi | 90% | 3169 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,139 psi | 77% | 3196 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,317 psi | 87% | 3091 fps | 97.7% |
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% | 53,388 psi | 84% | 2943 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,908 psi | 80% | 2949 fps | 97.6% |
| Accurate 3100 | <<locked>> | 86% | 35,186 psi | 55% | 2687 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 50,589 psi | 79% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,899 psi | 61% | 2802 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 47,500 psi | 74% | 2920 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 45,919 psi | 72% | 2963 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 96% | 50,169 psi | 79% | 3074 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,156 psi | 83% | 3153 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,211 psi | 76% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,503 psi | 81% | 3022 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,623 psi | 59% | 2808 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,975 psi | 67% | 2946 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,585 psi | 71% | 2956 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,180 psi | 72% | 3009 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,673 psi | 43% | 2536 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,781 psi | 56% | 2789 fps | 95.8% |
| Alliant Reloder-26 | 75.6 gr | 84% | 34,301 psi | 54% | 2789 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 45,339 psi | 71% | 2989 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 48,704 psi | 76% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 46,180 psi | 72% | 3009 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 42,786 psi | 67% | 2822 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 49,110 psi | 77% | 2972 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 40,727 psi | 64% | 2844 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 43,613 psi | 68% | 2874 fps | 95.3% |
| Hodgdon H4831 | 81.8 gr | 96% | 53,751 psi | 84% | 3084 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,692 psi | 83% | 3064 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,244 psi | 55% | 2697 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,606 psi | 84% | 3071 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,511 psi | 67% | 3002 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 39,885 psi | 63% | 2858 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 43% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,157 psi | 85% | 3035 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,966 psi | 78% | 2956 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,359 psi | 82% | 2992 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 40,872 psi | 64% | 2795 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,106 psi | 69% | 2851 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 37,376 psi | 59% | 2749 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 52,823 psi | 83% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,924 psi | 81% | 3015 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 98% | 51,126 psi | 80% | 3107 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 50,386 psi | 79% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,582 psi | 65% | 2795 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 39,929 psi | 63% | 2776 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 36,492 psi | 57% | 2720 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 50,836 psi | 80% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,572 psi | 73% | 2953 fps | 95.6% |
| Norma MRP | 76.9 gr | 88% | 39,537 psi | 62% | 2890 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,609 psi | 61% | 2792 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,488 psi | 81% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,921 psi | 75% | 3054 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,478 psi | 59% | 2776 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 42,815 psi | 67% | 2920 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,994 psi | 77% | 2953 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,658 psi | 72% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,696 psi | 61% | 2815 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,507 psi | 59% | 2818 fps | 96.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,494 psi | 62% | 2917 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,141 psi | 82% | 2969 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,934 psi | 72% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 50,691 psi | 79% | 3002 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 90% | 44,657 psi | 70% | 2936 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 42,786 psi | 67% | 2822 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,582 psi | 65% | 2795 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 50,386 psi | 79% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,929 psi | 63% | 2776 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,079 psi | 74% | 2956 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,978 psi | 74% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,727 psi | 64% | 2736 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,251 psi | 69% | 2930 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 46,006 psi | 72% | 2900 fps | 99.9% |
| Somchem S361 | <<locked>> | 92% | 52,228 psi | 82% | 2992 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 34,998 psi | 55% | 2746 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 42,482 psi | 67% | 2858 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 52,562 psi | 82% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,692 psi | 83% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,092 psi | 69% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,958 psi | 63% | 2795 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 92% | 41,756 psi | 65% | 2831 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 51,024 psi | 80% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,537 psi | 62% | 2795 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 30,719 psi | 48% | 2621 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 52,678 psi | 83% | 3150 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,146 psi | 61% | 2762 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 40,901 psi | 64% | 2851 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,992 psi | 44% | 2635 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,860 psi | 70% | 2900 fps | 95.2% |
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 95 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Nosler Custom Competition. Norma MRP delivers the highest muzzle velocity at 3,228 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,228 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 155.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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. Hodgdon H4831, Alliant Reloder-26, Norma MRP rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Nosler Custom Competition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.