Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Speer Magnum Tip Soft Point bullet and 85 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 Alliant Reloder-16.
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% | 57,377 psi | 90% | 3048 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,694 psi | 86% | 3061 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3169 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 54,302 psi | 85% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,535 psi | 87% | 3166 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 57,551 psi | 90% | 3140 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,420 psi | 88% | 3209 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 98% | 54,157 psi | 85% | 3196 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,566 psi | 90% | 3278 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,129 psi | 86% | 3114 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,114 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,043 psi | 88% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,551 psi | 90% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,724 psi | 87% | 3192 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3255 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3182 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,833 psi | 73% | 3097 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,230 psi | 85% | 3268 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 3169 fps | 97% |
| Bofors RP3 | <<locked>> | 84% | 56,159 psi | 88% | 3130 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3255 fps | 98.1% |
| Bofors RP7 | <<locked>> | 88% | 55,274 psi | 87% | 3110 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,217 psi | 88% | 3143 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 57,551 psi | 90% | 3219 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 57,043 psi | 89% | 3176 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,913 psi | 89% | 3182 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,623 psi | 89% | 3146 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,667 psi | 90% | 3182 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 54,143 psi | 85% | 3189 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 57% | 1998 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,942 psi | 89% | 3123 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,941 psi | 88% | 3100 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 56,391 psi | 88% | 3143 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,855 psi | 89% | 3136 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 55,898 psi | 88% | 3156 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,565 psi | 89% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,738 psi | 87% | 3130 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3232 fps | 96.5% |
| Lovex S062 | <<locked>> | 84% | 57,319 psi | 90% | 3117 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,232 psi | 90% | 3140 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 55,129 psi | 86% | 3123 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,688 psi | 75% | 3002 fps | 98.4% |
| Norma 203B | <<locked>> | 82% | 54,418 psi | 85% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,609 psi | 90% | 3202 fps | 97.8% |
| Norma MRP | <<locked>> | 98% | 56,884 psi | 89% | 3284 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 57,624 psi | 90% | 3205 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,506 psi | 87% | 3146 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3251 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 56,623 psi | 89% | 3202 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,198 psi | 79% | 3110 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 2044 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,217 psi | 88% | 3127 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,913 psi | 89% | 3245 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,463 psi | 87% | 3186 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,751 psi | 84% | 3212 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,035 psi | 72% | 3123 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,724 psi | 87% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,188 psi | 88% | 3127 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,447 psi | 85% | 3117 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 96% | 55,071 psi | 86% | 3179 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,274 psi | 87% | 3110 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,232 psi | 90% | 3140 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 57,319 psi | 90% | 3117 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,129 psi | 86% | 3123 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,041 psi | 85% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,855 psi | 89% | 3005 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,811 psi | 89% | 3084 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,592 psi | 86% | 3173 fps | 97.6% |
| Somchem S355 | <<locked>> | 86% | 56,043 psi | 88% | 3120 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,260 psi | 88% | 3107 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 57,522 psi | 90% | 3212 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,709 psi | 87% | 3153 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,159 psi | 88% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,434 psi | 88% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,421 psi | 90% | 3094 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,159 psi | 88% | 3146 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 3123 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 54,650 psi | 86% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,158 psi | 86% | 3143 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 56,521 psi | 89% | 3212 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,942 psi | 89% | 3271 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,898 psi | 88% | 3104 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,027 psi | 85% | 3159 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3248 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,999 psi | 88% | 3146 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% | 53,780 psi | 84% | 2999 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,213 psi | 80% | 2999 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 38,000 psi | 60% | 2795 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 50,952 psi | 80% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,175 psi | 61% | 2848 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,834 psi | 75% | 2972 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 46,151 psi | 72% | 3012 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 50,488 psi | 79% | 3127 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,403 psi | 84% | 3205 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,515 psi | 76% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,750 psi | 81% | 3074 fps | 99.9% |
| Alliant Reloder-16 | 67.2 gr | 80% | 37,884 psi | 59% | 2854 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,294 psi | 68% | 2995 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,963 psi | 72% | 3005 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,586 psi | 73% | 3061 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,905 psi | 44% | 2579 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 36,042 psi | 56% | 2835 fps | 95.6% |
| Alliant Reloder-26 | 77.9 gr | 84% | 34,650 psi | 54% | 2838 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 45,745 psi | 72% | 3038 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,095 psi | 77% | 3015 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 46,586 psi | 73% | 3061 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,873 psi | 67% | 2864 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 49,284 psi | 77% | 3022 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 41,060 psi | 64% | 2897 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 43,932 psi | 69% | 2923 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,040 psi | 83% | 3117 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,534 psi | 56% | 2743 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,911 psi | 84% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 43,149 psi | 68% | 2972 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 43% | 1788 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,299 psi | 79% | 3012 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,562 psi | 82% | 3041 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 41,191 psi | 65% | 2844 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,338 psi | 69% | 2900 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 37,608 psi | 59% | 2795 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 53,055 psi | 83% | 3107 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,359 psi | 82% | 3068 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 51,605 psi | 81% | 3159 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,531 psi | 79% | 3005 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,843 psi | 66% | 2844 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 40,161 psi | 63% | 2825 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 36,796 psi | 58% | 2766 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 51,111 psi | 80% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,818 psi | 73% | 3002 fps | 95.4% |
| Norma MRP | 79.2 gr | 88% | 39,856 psi | 62% | 2940 fps | 95% |
| Norma URP | <<locked>> | 80% | 38,856 psi | 61% | 2841 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 51,692 psi | 81% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,982 psi | 81% | 3176 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 37,753 psi | 59% | 2825 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 43,149 psi | 68% | 2966 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 44% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,269 psi | 77% | 3002 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,963 psi | 72% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,943 psi | 61% | 2861 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,695 psi | 59% | 2867 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,917 psi | 67% | 3045 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,286 psi | 82% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,209 psi | 72% | 2956 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 51,068 psi | 80% | 3054 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 45,121 psi | 71% | 2989 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,873 psi | 67% | 2864 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,843 psi | 66% | 2844 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 50,531 psi | 79% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,161 psi | 63% | 2825 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,413 psi | 74% | 3009 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,195 psi | 74% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,075 psi | 64% | 2785 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,715 psi | 70% | 2982 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,325 psi | 73% | 2949 fps | 99.9% |
| Somchem S361 | <<locked>> | 92% | 52,692 psi | 83% | 3045 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 35,288 psi | 55% | 2792 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 42,888 psi | 67% | 2907 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 52,823 psi | 83% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,953 psi | 83% | 2999 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,353 psi | 70% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,205 psi | 63% | 2841 fps | 98% |
| Vihtavuori N165 | <<locked>> | 92% | 42,235 psi | 66% | 2881 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 51,184 psi | 80% | 2986 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,711 psi | 62% | 2841 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,980 psi | 49% | 2667 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 96% | 53,113 psi | 83% | 3202 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,436 psi | 62% | 2808 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 41,191 psi | 65% | 2900 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 28,224 psi | 44% | 2674 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,310 psi | 71% | 2953 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 94 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Speer Magnum Tip Soft Point. Norma MRP delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,284 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 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 150.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2217, ADI AR 2225 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, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Speer Magnum Tip Soft Point 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.