Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Lapua Mega 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% | 57,043 psi | 89% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,115 psi | 88% | 3048 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,315 psi | 82% | 3074 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 57,421 psi | 90% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,505 psi | 85% | 3136 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 56,173 psi | 88% | 3117 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,508 psi | 90% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,680 psi | 87% | 3176 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,782 psi | 89% | 3251 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,679 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,853 psi | 86% | 3114 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,158 psi | 86% | 3199 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,579 psi | 89% | 3228 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,868 psi | 86% | 3159 fps | 97.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3156 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,950 psi | 77% | 3094 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,902 psi | 67% | 2999 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3304 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,478 psi | 89% | 3136 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 55,593 psi | 87% | 3110 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3156 fps | 96.7% |
| Bofors RP7 | <<locked>> | 90% | 54,969 psi | 86% | 3084 fps | 98% |
| Hodgdon H380 | <<locked>> | 86% | 56,159 psi | 88% | 3127 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 56,782 psi | 89% | 3189 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 56,623 psi | 89% | 3150 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 56,811 psi | 89% | 3127 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,550 psi | 87% | 3120 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,406 psi | 90% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,290 psi | 90% | 3232 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 57% | 1965 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,346 psi | 85% | 3074 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,464 psi | 90% | 3107 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,869 psi | 89% | 3107 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,144 psi | 88% | 3084 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 56,028 psi | 88% | 3117 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,724 psi | 89% | 3117 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 54,926 psi | 86% | 3130 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 56,304 psi | 88% | 3146 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,652 psi | 89% | 3091 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,172 psi | 86% | 3041 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,130 psi | 90% | 3100 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,840 psi | 89% | 3114 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 54,650 psi | 86% | 3100 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,294 psi | 68% | 2907 fps | 97% |
| Norma 201 | <<locked>> | 82% | 54,940 psi | 86% | 3058 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,724 psi | 87% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,157 psi | 85% | 3100 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,782 psi | 89% | 3173 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3248 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 56,884 psi | 89% | 3182 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 54,955 psi | 86% | 3123 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,579 psi | 87% | 3173 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 58% | 2011 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,941 psi | 88% | 3104 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,912 psi | 88% | 3189 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,999 psi | 88% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,273 psi | 85% | 3156 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,782 psi | 89% | 3248 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,564 psi | 87% | 3058 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,651 psi | 87% | 3107 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,406 psi | 90% | 3146 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 54,012 psi | 85% | 3146 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 90% | 54,969 psi | 86% | 3084 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,840 psi | 89% | 3114 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,652 psi | 89% | 3091 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,130 psi | 90% | 3100 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,650 psi | 86% | 3100 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,392 psi | 90% | 3169 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,609 psi | 90% | 3120 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,766 psi | 86% | 3084 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,869 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,695 psi | 89% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,608 psi | 89% | 3061 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3202 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 55,492 psi | 87% | 2986 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,450 psi | 90% | 3110 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,564 psi | 87% | 3100 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,086 psi | 88% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,665 psi | 86% | 3120 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 56,376 psi | 88% | 2972 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,956 psi | 88% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,260 psi | 88% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,087 psi | 89% | 3077 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,434 psi | 87% | 3117 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,517 psi | 79% | 3031 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 84% | 54,491 psi | 85% | 3028 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,592 psi | 86% | 3123 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3179 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,216 psi | 87% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,014 psi | 89% | 3196 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,324 psi | 69% | 3143 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,853 psi | 86% | 3094 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3114 fps | 97% |
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% | 49,951 psi | 78% | 2930 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,105 psi | 68% | 2808 fps | 95% |
| Accurate 3100 | <<locked>> | 90% | 37,101 psi | 58% | 2766 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 47,282 psi | 74% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,810 psi | 56% | 2759 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 80% | 52,707 psi | 83% | 3061 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,933 psi | 70% | 2900 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 48,791 psi | 76% | 3051 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,269 psi | 77% | 3120 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,237 psi | 71% | 2927 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,269 psi | 76% | 2995 fps | 99.6% |
| Alliant Reloder-16 | 62.6 gr | 80% | 35,186 psi | 55% | 2772 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,784 psi | 62% | 2910 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,167 psi | 75% | 3038 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 48,501 psi | 76% | 3087 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,240 psi | 46% | 2615 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,695 psi | 59% | 2864 fps | 95.8% |
| Alliant Reloder-26 | 76 gr | 88% | 36,390 psi | 57% | 2877 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,620 psi | 82% | 3074 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 45,426 psi | 71% | 2933 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 48,501 psi | 76% | 3087 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 42,743 psi | 67% | 2844 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 45,847 psi | 72% | 2940 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 40,611 psi | 64% | 2874 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 84% | 46,601 psi | 73% | 2966 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 53,330 psi | 84% | 3071 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,590 psi | 51% | 2661 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,024 psi | 78% | 3048 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,743 psi | 67% | 2949 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 42% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,995 psi | 80% | 3018 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,983 psi | 85% | 3058 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,224 psi | 74% | 2936 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,545 psi | 78% | 2963 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 43,511 psi | 68% | 2884 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,597 psi | 65% | 2822 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 34,563 psi | 54% | 2710 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 49,530 psi | 78% | 3028 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,069 psi | 83% | 3035 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,822 psi | 81% | 2986 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,355 psi | 74% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,030 psi | 61% | 2766 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 39,740 psi | 62% | 2802 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 38,087 psi | 60% | 2789 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 51,561 psi | 81% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,286 psi | 82% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,645 psi | 75% | 2982 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 49,559 psi | 78% | 3041 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 41,843 psi | 66% | 2976 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,723 psi | 56% | 2756 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,921 psi | 75% | 3002 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 39,668 psi | 62% | 2861 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 43% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,977 psi | 72% | 2920 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,069 psi | 82% | 3123 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,322 psi | 66% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,592 psi | 56% | 2776 fps | 95.9% |
| ReloadSwiss RS 70 | 70.1 gr | 82% | 37,275 psi | 58% | 2841 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 49,095 psi | 77% | 2949 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,728 psi | 67% | 2874 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 53,751 psi | 84% | 3084 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 47,166 psi | 74% | 3015 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 42,743 psi | 67% | 2844 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,030 psi | 61% | 2766 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,069 psi | 83% | 3035 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,355 psi | 74% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,740 psi | 62% | 2802 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,874 psi | 69% | 2927 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,809 psi | 84% | 3058 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,242 psi | 80% | 3028 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,330 psi | 82% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,164 psi | 69% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,915 psi | 64% | 2766 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 46,731 psi | 73% | 3012 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 52,156 psi | 82% | 2936 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,505 psi | 84% | 3048 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,120 psi | 68% | 2874 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 32,271 psi | 51% | 2710 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 44,933 psi | 70% | 2940 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,852 psi | 83% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,211 psi | 77% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,501 psi | 78% | 2930 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,147 psi | 64% | 2802 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 37,101 psi | 58% | 2759 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 96% | 44,179 psi | 69% | 2910 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 47,877 psi | 75% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,651 psi | 57% | 2756 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 32,140 psi | 50% | 2700 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,448 psi | 57% | 2726 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 40,611 psi | 64% | 2874 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,659 psi | 43% | 2638 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,271 psi | 80% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,645 psi | 75% | 2982 fps | 95.3% |
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 | Lapua Mega. Alliant Reloder-26 delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,304 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 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-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 | Lapua Mega 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.