Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 135gr | IBEX Viper bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 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% | 55,259 psi | 87% | 3143 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,143 psi | 86% | 3166 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3205 fps | 98.1% |
| Accurate 4064 | <<locked>> | 84% | 55,288 psi | 87% | 3196 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,013 psi | 86% | 3278 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 82% | 56,420 psi | 88% | 3258 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 88% | 57,348 psi | 90% | 3255 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 98% | 55,419 psi | 87% | 3294 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,405 psi | 88% | 3383 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,129 psi | 86% | 3232 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,303 psi | 87% | 3251 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,839 psi | 86% | 3330 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,289 psi | 88% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,636 psi | 86% | 3281 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,240 psi | 77% | 3225 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,323 psi | 68% | 3114 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 3432 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,246 psi | 88% | 3264 fps | 99.6% |
| Bofors RP3 | <<locked>> | 86% | 56,347 psi | 88% | 3255 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 55,405 psi | 87% | 3215 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 86% | 56,391 psi | 88% | 3261 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 92% | 56,739 psi | 89% | 3320 fps | 98% |
| Hodgdon H4350 | <<locked>> | 90% | 56,420 psi | 88% | 3274 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 82% | 57,043 psi | 89% | 3268 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,317 psi | 87% | 3248 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,116 psi | 90% | 3304 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,029 psi | 89% | 3353 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 2070 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,375 psi | 85% | 3205 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,682 psi | 90% | 3255 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,898 psi | 89% | 3238 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,144 psi | 88% | 3209 fps | 97.8% |
| IMR 4350 | <<locked>> | 94% | 55,825 psi | 87% | 3241 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,666 psi | 89% | 3241 fps | 97.8% |
| IMR 4831 | <<locked>> | 94% | 55,056 psi | 86% | 3261 fps | 99.5% |
| IMR 4895 | <<locked>> | 84% | 56,710 psi | 89% | 3287 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 57,406 psi | 90% | 3238 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,129 psi | 86% | 3169 fps | 99.9% |
| Lovex S062 | <<locked>> | 86% | 57,522 psi | 90% | 3241 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,159 psi | 90% | 3248 fps | 99% |
| Lovex S070 | <<locked>> | 92% | 55,042 psi | 86% | 3228 fps | 97.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,454 psi | 70% | 3038 fps | 96.2% |
| Norma 201 | <<locked>> | 82% | 55,782 psi | 87% | 3205 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,130 psi | 88% | 3202 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,665 psi | 86% | 3238 fps | 99.9% |
| Norma 204 | <<locked>> | 94% | 56,550 psi | 89% | 3291 fps | 96.1% |
| Norma MRPᴾ | <<locked>> | 100% | 55,216 psi | 87% | 3373 fps | 97.7% |
| Norma URP | <<locked>> | 94% | 56,739 psi | 89% | 3310 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 84% | 54,940 psi | 86% | 3255 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 94% | 55,419 psi | 87% | 3301 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 58% | 2116 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,115 psi | 88% | 3232 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,825 psi | 87% | 3323 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,811 psi | 87% | 3360 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,491 psi | 85% | 3291 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,463 psi | 88% | 3373 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,333 psi | 88% | 3205 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,362 psi | 88% | 3248 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3330 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 90% | 55,405 psi | 87% | 3215 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,159 psi | 90% | 3248 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,406 psi | 90% | 3238 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,522 psi | 90% | 3241 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,042 psi | 86% | 3228 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,276 psi | 90% | 3301 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,853 psi | 86% | 3219 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,101 psi | 88% | 3130 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,695 psi | 89% | 3123 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,087 psi | 89% | 3189 fps | 98% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3323 fps | 96.6% |
| Somchem S335 | <<locked>> | 82% | 56,086 psi | 88% | 3130 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,261 psi | 90% | 3238 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,115 psi | 88% | 3241 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,695 psi | 87% | 3317 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,013 psi | 86% | 3248 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 82% | 56,405 psi | 88% | 3110 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,202 psi | 88% | 3163 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,434 psi | 88% | 3173 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,305 psi | 90% | 3215 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,390 psi | 87% | 3245 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 84% | 54,897 psi | 86% | 3169 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,679 psi | 86% | 3251 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,100 psi | 86% | 3314 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,969 psi | 86% | 3209 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,739 psi | 89% | 3320 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,831 psi | 70% | 3268 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,100 psi | 86% | 3228 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3232 fps | 95.9% |
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% | 51,924 psi | 81% | 3091 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,660 psi | 76% | 3045 fps | 95.3% |
| Accurate 3100 | <<locked>> | 92% | 40,915 psi | 64% | 2963 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 49,037 psi | 77% | 3087 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,246 psi | 58% | 2904 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 53,171 psi | 83% | 3199 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 45,266 psi | 71% | 3025 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 96% | 51,880 psi | 81% | 3225 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,414 psi | 77% | 3251 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,832 psi | 72% | 3061 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,863 psi | 77% | 3133 fps | 99.2% |
| Alliant Reloder-16 | 63.6 gr | 80% | 35,897 psi | 56% | 2897 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,364 psi | 63% | 3041 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 51,416 psi | 81% | 3219 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 32,300 psi | 51% | 2808 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 40,886 psi | 64% | 3051 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 88% | 37,231 psi | 58% | 3005 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,808 psi | 83% | 3202 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 46,485 psi | 73% | 3077 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 46,296 psi | 73% | 3035 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 46,688 psi | 73% | 3077 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 46,688 psi | 73% | 3127 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 49,850 psi | 78% | 3150 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,751 psi | 84% | 3212 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,620 psi | 53% | 2792 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,154 psi | 79% | 3182 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 46,195 psi | 72% | 3140 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 43% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,213 psi | 80% | 3153 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 54,099 psi | 85% | 3199 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,601 psi | 75% | 3068 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,690 psi | 78% | 3087 fps | 96.5% |
| IMR 4350 | <<locked>> | 88% | 46,702 psi | 73% | 3064 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 44,599 psi | 70% | 3002 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 35,723 psi | 56% | 2848 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 50,082 psi | 78% | 3166 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 53,853 psi | 84% | 3182 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,996 psi | 81% | 3117 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 48,109 psi | 75% | 3074 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 40,161 psi | 63% | 2900 fps | 95.3% |
| Lovex S070 | <<locked>> | 84% | 43,323 psi | 68% | 2992 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 41,930 psi | 66% | 2986 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,533 psi | 82% | 3150 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,620 psi | 82% | 3146 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,298 psi | 76% | 3120 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 53,127 psi | 83% | 3228 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 45,252 psi | 71% | 3166 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,666 psi | 57% | 2890 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 48,298 psi | 76% | 3136 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 43,004 psi | 67% | 3051 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 44% | 1896 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,543 psi | 73% | 3048 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,185 psi | 82% | 3258 fps | 99.5% |
| ReloadSwiss RS 60 | 68.5 gr | 80% | 42,699 psi | 67% | 3110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,521 psi | 57% | 2907 fps | 95.1% |
| ReloadSwiss RS 70 | 73 gr | 84% | 40,524 psi | 64% | 3031 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,154 psi | 79% | 3097 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 69% | 3015 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 50,633 psi | 79% | 3205 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 46,296 psi | 73% | 3035 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,161 psi | 63% | 2900 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,853 psi | 84% | 3182 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,109 psi | 75% | 3074 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 43,323 psi | 68% | 2992 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,309 psi | 69% | 3061 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,503 psi | 81% | 3159 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,939 psi | 83% | 3081 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,831 psi | 70% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 44,498 psi | 70% | 2953 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 50,169 psi | 79% | 3199 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 52,895 psi | 83% | 3077 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,795 psi | 84% | 3182 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 44,121 psi | 69% | 3015 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 33,373 psi | 52% | 2844 fps | 97.9% |
| Somchem S385 | <<locked>> | 94% | 48,530 psi | 76% | 3127 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 53,272 psi | 83% | 3064 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,009 psi | 78% | 3068 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,009 psi | 78% | 3071 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,090 psi | 66% | 2936 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 37,942 psi | 59% | 2890 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 48,472 psi | 76% | 3058 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,608 psi | 59% | 2890 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 84% | 33,388 psi | 52% | 2841 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,275 psi | 58% | 2854 fps | 98% |
| Winchester 760 | <<locked>> | 86% | 46,891 psi | 73% | 3130 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 30,850 psi | 48% | 2841 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,677 psi | 81% | 3169 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,169 psi | 80% | 3166 fps | 95% |
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 | 135gr | IBEX Viper. Alliant Reloder-26 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,432 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 135.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 135gr | IBEX Viper 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.