Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Hornady ECX bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 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% | 56,724 psi | 89% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,056 psi | 86% | 3058 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 3084 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 57,145 psi | 90% | 3097 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,476 psi | 85% | 3146 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 56,391 psi | 88% | 3133 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,725 psi | 90% | 3136 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,985 psi | 88% | 3196 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,522 psi | 90% | 3271 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,144 psi | 88% | 3189 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,766 psi | 86% | 3104 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,216 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,680 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,116 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,347 psi | 87% | 3179 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3173 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 3107 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,989 psi | 67% | 3009 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3320 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,536 psi | 89% | 3150 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 55,695 psi | 87% | 3123 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3173 fps | 97% |
| Bofors RP7 | <<locked>> | 90% | 55,158 psi | 86% | 3100 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 56,101 psi | 88% | 3136 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 57,116 psi | 90% | 3205 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,913 psi | 89% | 3166 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,029 psi | 89% | 3140 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,970 psi | 88% | 3133 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,551 psi | 90% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,577 psi | 84% | 3176 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,665 psi | 86% | 3091 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,667 psi | 90% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,116 psi | 90% | 3120 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,347 psi | 88% | 3097 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 56,405 psi | 88% | 3136 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,000 psi | 89% | 3133 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 55,172 psi | 86% | 3143 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 56,666 psi | 89% | 3163 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,898 psi | 89% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,288 psi | 87% | 3054 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,217 psi | 90% | 3114 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,884 psi | 89% | 3127 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 54,665 psi | 86% | 3110 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,381 psi | 68% | 2917 fps | 97.2% |
| Norma 201 | <<locked>> | 82% | 54,810 psi | 86% | 3068 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,724 psi | 87% | 3071 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,476 psi | 85% | 3114 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,363 psi | 90% | 3189 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3264 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 57,043 psi | 89% | 3192 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,419 psi | 87% | 3140 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,057 psi | 88% | 3192 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,144 psi | 88% | 3117 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,144 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,608 psi | 89% | 3238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,737 psi | 86% | 3176 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,261 psi | 90% | 3264 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,666 psi | 87% | 3071 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,782 psi | 87% | 3120 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,667 psi | 90% | 3163 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 54,462 psi | 85% | 3163 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,158 psi | 86% | 3100 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,884 psi | 89% | 3127 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,898 psi | 89% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,217 psi | 90% | 3114 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,665 psi | 86% | 3110 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,667 psi | 90% | 3182 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,940 psi | 86% | 3097 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,811 psi | 87% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,913 psi | 89% | 3002 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,768 psi | 89% | 3074 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3222 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 55,434 psi | 87% | 2995 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,522 psi | 90% | 3120 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,767 psi | 87% | 3114 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,463 psi | 88% | 3196 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,114 psi | 86% | 3140 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,347 psi | 88% | 2982 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,970 psi | 88% | 3031 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,420 psi | 88% | 3048 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,276 psi | 90% | 3091 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,608 psi | 87% | 3130 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 3045 fps | 97% |
| Vihtavuori N540 | <<locked>> | 84% | 54,723 psi | 86% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,810 psi | 86% | 3136 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,201 psi | 87% | 3192 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,622 psi | 87% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,334 psi | 90% | 3212 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,556 psi | 70% | 3156 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,129 psi | 86% | 3107 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% | 49,472 psi | 78% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,950 psi | 75% | 2930 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 36,825 psi | 58% | 2769 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 46,891 psi | 73% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,607 psi | 56% | 2762 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,939 psi | 83% | 3074 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,831 psi | 70% | 2907 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 49,052 psi | 77% | 3064 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,705 psi | 78% | 3136 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,803 psi | 72% | 2995 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,194 psi | 71% | 2933 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,428 psi | 76% | 3009 fps | 99.7% |
| Alliant Reloder-16 | 64.1 gr | 80% | 34,998 psi | 55% | 2776 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,813 psi | 62% | 2917 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,443 psi | 76% | 3051 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,687 psi | 72% | 3038 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,008 psi | 45% | 2618 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,637 psi | 59% | 2877 fps | 96% |
| Alliant Reloder-26 | 76.1 gr | 86% | 33,663 psi | 53% | 2808 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,953 psi | 83% | 3087 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 45,339 psi | 71% | 2943 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 45,687 psi | 72% | 3038 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 42,728 psi | 67% | 2858 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 45,847 psi | 72% | 2949 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 40,640 psi | 64% | 2884 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 46,702 psi | 73% | 2979 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 53,563 psi | 84% | 3084 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,445 psi | 51% | 2664 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,227 psi | 79% | 3061 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,902 psi | 67% | 2963 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 42% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,097 psi | 80% | 3028 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,954 psi | 85% | 3064 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,108 psi | 74% | 2946 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,545 psi | 78% | 2979 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 43,526 psi | 68% | 2894 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,597 psi | 65% | 2835 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 34,287 psi | 54% | 2713 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 49,690 psi | 78% | 3041 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,098 psi | 83% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,967 psi | 81% | 2999 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,297 psi | 74% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,827 psi | 61% | 2772 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 39,639 psi | 62% | 2808 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 37,768 psi | 59% | 2792 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 51,459 psi | 81% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,301 psi | 82% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,761 psi | 75% | 2992 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 46,514 psi | 73% | 2992 fps | 95% |
| Norma MRP | <<locked>> | 92% | 41,858 psi | 66% | 2989 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,578 psi | 56% | 2762 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 48,211 psi | 76% | 3015 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 39,769 psi | 62% | 2871 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,296 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,977 psi | 72% | 2933 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,330 psi | 82% | 3136 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,395 psi | 66% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,476 psi | 56% | 2779 fps | 96% |
| ReloadSwiss RS 70 | 70.2 gr | 80% | 34,780 psi | 55% | 2782 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 48,994 psi | 77% | 2963 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,511 psi | 67% | 2881 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 94% | 50,691 psi | 79% | 3041 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 47,413 psi | 74% | 3031 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 42,728 psi | 67% | 2858 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,827 psi | 61% | 2772 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,098 psi | 83% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,297 psi | 74% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,639 psi | 62% | 2808 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,932 psi | 69% | 2940 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,401 psi | 81% | 3038 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,489 psi | 82% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,237 psi | 69% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,785 psi | 64% | 2776 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 46,992 psi | 74% | 3025 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 52,127 psi | 82% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,824 psi | 84% | 3064 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,960 psi | 67% | 2881 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 32,039 psi | 50% | 2710 fps | 98.4% |
| Somchem S385 | <<locked>> | 90% | 41,989 psi | 66% | 2887 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 53,069 psi | 83% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,255 psi | 77% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,516 psi | 78% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,017 psi | 64% | 2808 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,130 psi | 58% | 2769 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 96% | 44,280 psi | 69% | 2923 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 47,964 psi | 75% | 2930 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,564 psi | 57% | 2762 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 31,923 psi | 50% | 2700 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,492 psi | 57% | 2740 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 40,640 psi | 64% | 2884 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,311 psi | 43% | 2635 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,372 psi | 81% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,950 psi | 75% | 2999 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 93 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Hornady ECX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,320 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, 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. Alliant Reloder-16, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Hornady ECX 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.