Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Berger BT Target 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 Hodgdon H414.
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% | 56,130 psi | 88% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,232 psi | 90% | 3048 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3094 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 56,521 psi | 89% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,725 psi | 90% | 3150 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,507 psi | 89% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,940 psi | 86% | 3133 fps | 97.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3182 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,043 psi | 88% | 3199 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,377 psi | 90% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,580 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,563 psi | 86% | 3150 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,086 psi | 88% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,302 psi | 85% | 3117 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3179 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3107 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,556 psi | 71% | 3025 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,449 psi | 88% | 3258 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 3094 fps | 96.8% |
| Bofors RP3 | <<locked>> | 84% | 54,810 psi | 86% | 3058 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3179 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 57,667 psi | 90% | 3097 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 55,042 psi | 86% | 3071 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,072 psi | 88% | 3143 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 55,651 psi | 87% | 3100 fps | 98% |
| Hodgdon H4831 | <<locked>> | 98% | 56,579 psi | 89% | 3127 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,911 psi | 86% | 3071 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,391 psi | 88% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,449 psi | 88% | 3179 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 57% | 1949 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,942 psi | 89% | 3077 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,927 psi | 88% | 3051 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,911 psi | 86% | 3031 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 55,216 psi | 87% | 3071 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,854 psi | 88% | 3071 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 54,360 psi | 85% | 3081 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,506 psi | 87% | 3094 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,780 psi | 84% | 3153 fps | 96.1% |
| Lovex S060 | <<locked>> | 82% | 57,232 psi | 90% | 3035 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,115 psi | 88% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,028 psi | 88% | 3064 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 57,348 psi | 90% | 3110 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,180 psi | 72% | 2927 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 57,406 psi | 90% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,869 psi | 89% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,130 psi | 88% | 3127 fps | 97.6% |
| Norma MRP | <<locked>> | 98% | 55,129 psi | 86% | 3209 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 56,231 psi | 88% | 3133 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,186 psi | 85% | 3071 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,288 psi | 85% | 3169 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 92% | 55,085 psi | 86% | 3130 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,544 psi | 76% | 3031 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 58% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,969 psi | 86% | 3054 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,332 psi | 87% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,595 psi | 90% | 3173 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,188 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,686 psi | 70% | 3045 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 82% | 54,752 psi | 86% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,911 psi | 86% | 3054 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,579 psi | 89% | 3100 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 98% | 57,363 psi | 90% | 3166 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 57,667 psi | 90% | 3097 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,028 psi | 88% | 3064 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 56,115 psi | 88% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,348 psi | 90% | 3110 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,521 psi | 89% | 3117 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,334 psi | 90% | 3091 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,666 psi | 87% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,564 psi | 87% | 3015 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,869 psi | 89% | 3159 fps | 98.1% |
| Somchem S355 | <<locked>> | 86% | 54,723 psi | 86% | 3048 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,666 psi | 87% | 3133 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,302 psi | 85% | 3077 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,056 psi | 86% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,158 psi | 86% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,072 psi | 88% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,737 psi | 86% | 3071 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3051 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 56,971 psi | 89% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,624 psi | 90% | 3133 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,853 psi | 86% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,347 psi | 87% | 3192 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,331 psi | 85% | 3031 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,304 psi | 88% | 3146 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,601 psi | 75% | 3169 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,682 psi | 90% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,360 psi | 85% | 3071 fps | 97.4% |
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% | 52,649 psi | 83% | 2930 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,212 psi | 79% | 2930 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 36,898 psi | 58% | 2730 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 49,893 psi | 78% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,101 psi | 60% | 2779 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 46,920 psi | 74% | 2904 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 45,121 psi | 71% | 2943 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 98% | 52,591 psi | 82% | 3117 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,054 psi | 82% | 3133 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,572 psi | 75% | 2933 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,647 psi | 79% | 3002 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,043 psi | 58% | 2789 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,221 psi | 66% | 2927 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,759 psi | 70% | 2933 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,208 psi | 71% | 2986 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,051 psi | 46% | 2579 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,128 psi | 55% | 2766 fps | 95.4% |
| Alliant Reloder-26 | 74.4 gr | 84% | 33,562 psi | 53% | 2766 fps | 95.6% |
| Bofors RP15 | <<locked>> | 96% | 44,570 psi | 70% | 2969 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 47,834 psi | 75% | 2940 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,208 psi | 71% | 2986 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,047 psi | 66% | 2799 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,327 psi | 76% | 2953 fps | 99.2% |
| Hodgdon H414 | 67.7 gr | 80% | 40,176 psi | 63% | 2831 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 45,847 psi | 72% | 2917 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 52,765 psi | 83% | 3061 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,621 psi | 54% | 2677 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,750 psi | 83% | 3054 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,003 psi | 66% | 2904 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 43% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,345 psi | 84% | 3018 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,313 psi | 77% | 2940 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,663 psi | 81% | 2972 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 42,946 psi | 67% | 2838 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,395 psi | 68% | 2831 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 36,622 psi | 57% | 2730 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 51,982 psi | 81% | 3035 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 50,198 psi | 79% | 3084 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 53,838 psi | 84% | 2982 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,545 psi | 78% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,046 psi | 64% | 2779 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 39,247 psi | 62% | 2756 fps | 95.5% |
| Lovex S071 | <<locked>> | 92% | 35,679 psi | 56% | 2700 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 53,954 psi | 85% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,024 psi | 78% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,716 psi | 72% | 2933 fps | 95.2% |
| Norma MRP | 77.4 gr | 90% | 41,539 psi | 65% | 2936 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,855 psi | 59% | 2772 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 50,488 psi | 79% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 50,473 psi | 79% | 3100 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 36,796 psi | 58% | 2756 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 96% | 41,829 psi | 66% | 2890 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,283 psi | 76% | 2933 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,860 psi | 70% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,956 psi | 59% | 2795 fps | 97.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,753 psi | 58% | 2799 fps | 96.5% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,539 psi | 65% | 2969 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,445 psi | 81% | 2953 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,078 psi | 71% | 2884 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 49,690 psi | 78% | 2979 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 43,801 psi | 69% | 2913 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 42,047 psi | 66% | 2799 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,046 psi | 64% | 2779 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 49,545 psi | 78% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,247 psi | 62% | 2756 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,311 psi | 73% | 2940 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,737 psi | 84% | 3031 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,151 psi | 72% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,205 psi | 63% | 2723 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,354 psi | 73% | 2969 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 45,368 psi | 71% | 2884 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,389 psi | 54% | 2730 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 41,655 psi | 65% | 2835 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 51,619 psi | 81% | 2917 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,837 psi | 81% | 2930 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,323 psi | 68% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,233 psi | 61% | 2772 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 43,903 psi | 69% | 2871 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 50,256 psi | 79% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,827 psi | 61% | 2776 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 29,994 psi | 47% | 2602 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 96% | 51,663 psi | 81% | 3127 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,406 psi | 60% | 2743 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 40,176 psi | 63% | 2831 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,485 psi | 43% | 2608 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,838 psi | 84% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,152 psi | 74% | 2943 fps | 95.8% |
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 99 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Berger BT Target. Alliant Reloder-26 delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,949 fps to 3,258 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 1:13.0 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. Alliant Reloder-26, Norma MRP, Hodgdon H414 rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Berger BT Target 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.