Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Osprey Virtus bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Alliant Reloder-26.
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>> | 84% | 56,797 psi | 89% | 3045 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,100 psi | 86% | 3061 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3091 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 57,217 psi | 90% | 3100 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,795 psi | 86% | 3153 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 56,463 psi | 88% | 3133 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,288 psi | 85% | 3084 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,231 psi | 88% | 3199 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,580 psi | 90% | 3274 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,042 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,274 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,724 psi | 87% | 3219 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,159 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,376 psi | 87% | 3179 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3176 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3114 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,047 psi | 67% | 3012 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3320 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,826 psi | 89% | 3153 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 55,753 psi | 87% | 3123 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3176 fps | 97% |
| Bofors RP7 | <<locked>> | 90% | 55,201 psi | 87% | 3100 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 56,376 psi | 88% | 3143 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 57,145 psi | 90% | 3209 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,956 psi | 89% | 3169 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,087 psi | 89% | 3143 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,043 psi | 88% | 3136 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,609 psi | 90% | 3182 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,867 psi | 84% | 3182 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1975 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,723 psi | 86% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,174 psi | 90% | 3120 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,391 psi | 88% | 3100 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 56,434 psi | 88% | 3136 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,043 psi | 89% | 3133 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 55,274 psi | 87% | 3143 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 56,724 psi | 89% | 3163 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,956 psi | 89% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,361 psi | 87% | 3054 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,290 psi | 90% | 3114 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,927 psi | 89% | 3127 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 54,708 psi | 86% | 3110 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2917 fps | 97.2% |
| Norma 201 | <<locked>> | 82% | 54,911 psi | 86% | 3071 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,796 psi | 87% | 3071 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,549 psi | 85% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,392 psi | 90% | 3192 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3268 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 57,319 psi | 90% | 3196 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,492 psi | 87% | 3143 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,115 psi | 88% | 3192 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,680 psi | 57% | 2021 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,391 psi | 88% | 3123 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,217 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,666 psi | 89% | 3241 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,781 psi | 86% | 3176 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,537 psi | 90% | 3271 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,738 psi | 87% | 3074 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,840 psi | 88% | 3120 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,114 psi | 85% | 3104 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,520 psi | 85% | 3166 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 90% | 55,201 psi | 87% | 3100 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,927 psi | 89% | 3127 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,956 psi | 89% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,290 psi | 90% | 3114 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,708 psi | 86% | 3110 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,711 psi | 90% | 3182 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,998 psi | 86% | 3100 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,883 psi | 88% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,971 psi | 89% | 3002 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,840 psi | 89% | 3077 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,041 psi | 85% | 3159 fps | 97.3% |
| Somchem S335 | <<locked>> | 82% | 55,492 psi | 87% | 2999 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,811 psi | 87% | 3117 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,507 psi | 89% | 3199 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,187 psi | 86% | 3140 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,420 psi | 88% | 2986 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,043 psi | 88% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,492 psi | 89% | 3048 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,319 psi | 90% | 3091 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,869 psi | 88% | 3136 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 3048 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 84% | 54,795 psi | 86% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,853 psi | 86% | 3136 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3192 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,666 psi | 87% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,406 psi | 90% | 3212 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,585 psi | 70% | 3156 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,230 psi | 87% | 3110 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3133 fps | 97.3% |
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% | 49,545 psi | 78% | 2936 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,008 psi | 75% | 2933 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 36,854 psi | 58% | 2772 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,963 psi | 74% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,665 psi | 56% | 2766 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,997 psi | 83% | 3074 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,904 psi | 70% | 2910 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 49,081 psi | 77% | 3064 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,763 psi | 78% | 3140 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,266 psi | 71% | 2936 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,486 psi | 76% | 3012 fps | 99.7% |
| Alliant Reloder-16 | 64.2 gr | 80% | 35,056 psi | 55% | 2779 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,900 psi | 63% | 2920 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,515 psi | 76% | 3054 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,730 psi | 72% | 3041 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,051 psi | 46% | 2618 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,681 psi | 59% | 2877 fps | 96.1% |
| Alliant Reloder-26 | 76.2 gr | 86% | 33,692 psi | 53% | 2812 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,997 psi | 83% | 3087 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 45,397 psi | 71% | 2946 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 45,730 psi | 72% | 3041 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 42,786 psi | 67% | 2861 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 45,905 psi | 72% | 2953 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 40,698 psi | 64% | 2887 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 46,760 psi | 73% | 2979 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 53,635 psi | 84% | 3087 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,518 psi | 51% | 2667 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,285 psi | 79% | 3061 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,931 psi | 67% | 2966 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 42% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,169 psi | 80% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,166 psi | 74% | 2949 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,603 psi | 78% | 2979 fps | 97.7% |
| IMR 4350 | <<locked>> | 86% | 43,569 psi | 68% | 2894 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,655 psi | 65% | 2835 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 34,345 psi | 54% | 2713 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 49,763 psi | 78% | 3045 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,171 psi | 83% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,040 psi | 82% | 3002 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,369 psi | 74% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,885 psi | 61% | 2776 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 39,697 psi | 62% | 2812 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 37,985 psi | 60% | 2799 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 51,532 psi | 81% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,373 psi | 82% | 3018 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,819 psi | 75% | 2995 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 46,557 psi | 73% | 2992 fps | 95% |
| Norma MRP | <<locked>> | 92% | 42,076 psi | 66% | 2992 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,636 psi | 56% | 2762 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 48,269 psi | 76% | 3018 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 37,144 psi | 58% | 2808 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 43% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,050 psi | 72% | 2936 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,402 psi | 82% | 3140 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,453 psi | 67% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,534 psi | 56% | 2779 fps | 96.1% |
| ReloadSwiss RS 70 | 70.3 gr | 80% | 34,809 psi | 55% | 2785 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,066 psi | 77% | 2963 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,583 psi | 67% | 2881 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 94% | 50,720 psi | 79% | 3041 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 47,500 psi | 74% | 3035 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 42,786 psi | 67% | 2861 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,885 psi | 61% | 2776 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,171 psi | 83% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,369 psi | 74% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,697 psi | 62% | 2812 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,990 psi | 69% | 2943 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,488 psi | 81% | 3041 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,562 psi | 82% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,309 psi | 69% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,828 psi | 64% | 2776 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,065 psi | 74% | 3028 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,185 psi | 82% | 2946 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,018 psi | 67% | 2884 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 32,097 psi | 50% | 2713 fps | 98.4% |
| Somchem S385 | <<locked>> | 90% | 42,047 psi | 66% | 2887 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 53,156 psi | 83% | 2940 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,342 psi | 77% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,574 psi | 78% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,075 psi | 64% | 2808 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,188 psi | 58% | 2769 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 44,483 psi | 70% | 2927 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,022 psi | 75% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,622 psi | 57% | 2766 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 31,981 psi | 50% | 2700 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,521 psi | 57% | 2740 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 40,872 psi | 64% | 2890 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,354 psi | 43% | 2638 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,430 psi | 81% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,167 psi | 75% | 3002 fps | 95.6% |
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 90 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Osprey Virtus. Alliant Reloder-26 delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,320 fps. Accurate 3100 gives the best case fill at 100 %, and 90 of the 90 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 1:13.0 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. ReloadSwiss RS 70, Alliant Reloder-16, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Osprey Virtus 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.