Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Lapua Mega bullet and 91 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-17 and ReloadSwiss RS 60.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 53,635 psi | 88% | 3018 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 51,982 psi | 85% | 3015 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,283 psi | 79% | 3038 fps | 98.2% |
| Accurate 4064 | <<locked>> | 86% | 53,969 psi | 89% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,288 psi | 89% | 3169 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 53,388 psi | 88% | 3100 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,592 psi | 90% | 3104 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 52,112 psi | 86% | 3143 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,388 psi | 88% | 3232 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,967 psi | 85% | 3140 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,882 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 51,924 psi | 85% | 3094 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,056 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,707 psi | 87% | 3205 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,621 psi | 90% | 3189 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,484 psi | 75% | 3068 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,842 psi | 65% | 2959 fps | 96.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,895 psi | 85% | 3264 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,171 psi | 87% | 3114 fps | 99.8% |
| Bofors RP3 | <<locked>> | 86% | 52,156 psi | 86% | 3087 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 52,141 psi | 86% | 3061 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 86% | 52,794 psi | 87% | 3100 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 53,127 psi | 87% | 3163 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 90% | 53,301 psi | 88% | 3123 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 53,983 psi | 89% | 3114 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 51,677 psi | 85% | 3094 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,766 psi | 88% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,200 psi | 87% | 3196 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 59% | 1962 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,056 psi | 90% | 3114 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,302 psi | 89% | 3094 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,969 psi | 89% | 3087 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,388 psi | 88% | 3061 fps | 98.2% |
| IMR 4350 | <<locked>> | 94% | 52,736 psi | 87% | 3091 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,722 psi | 88% | 3094 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 54,708 psi | 90% | 3159 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 53,287 psi | 87% | 3127 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,505 psi | 88% | 3074 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,562 psi | 86% | 3022 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,969 psi | 89% | 3081 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,461 psi | 88% | 3087 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,679 psi | 90% | 3130 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,059 psi | 66% | 2874 fps | 96.3% |
| Norma 201 | <<locked>> | 82% | 52,098 psi | 86% | 3041 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,823 psi | 87% | 3045 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,578 psi | 90% | 3136 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,258 psi | 87% | 3143 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 51,097 psi | 84% | 3212 fps | 98% |
| Norma URP | <<locked>> | 94% | 53,113 psi | 87% | 3156 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 84% | 51,822 psi | 85% | 3107 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 51,924 psi | 85% | 3146 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,448 psi | 60% | 2005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,837 psi | 87% | 3081 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,373 psi | 86% | 3163 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,272 psi | 86% | 3202 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,085 psi | 89% | 3192 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,910 psi | 87% | 3219 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 52,765 psi | 87% | 3045 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 52,243 psi | 86% | 3084 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,867 psi | 88% | 3176 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 90% | 52,141 psi | 86% | 3061 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,461 psi | 88% | 3087 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,505 psi | 88% | 3074 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,969 psi | 89% | 3081 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,679 psi | 90% | 3130 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,824 psi | 88% | 3146 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,505 psi | 89% | 3100 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 51,822 psi | 85% | 3068 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,171 psi | 87% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,853 psi | 88% | 2976 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,505 psi | 88% | 3035 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,359 psi | 88% | 3173 fps | 97% |
| Somchem S335 | <<locked>> | 82% | 52,779 psi | 87% | 2972 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,114 psi | 89% | 3087 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,504 psi | 86% | 3084 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 51,779 psi | 85% | 3159 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,650 psi | 90% | 3153 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 53,621 psi | 88% | 2959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 52,736 psi | 87% | 3005 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,330 psi | 88% | 3022 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,722 psi | 88% | 3058 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 51,967 psi | 85% | 3094 fps | 99.6% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,891 psi | 77% | 2999 fps | 96% |
| Vihtavuori N540 | <<locked>> | 86% | 54,926 psi | 90% | 3064 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,476 psi | 89% | 3156 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,647 psi | 83% | 3150 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 51,721 psi | 85% | 3061 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,345 psi | 88% | 3169 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,930 psi | 67% | 3100 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 51,895 psi | 85% | 3077 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,227 psi | 84% | 3081 fps | 96.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 46,992 psi | 77% | 2913 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,469 psi | 75% | 2894 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 36,738 psi | 60% | 2799 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,425 psi | 73% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,388 psi | 55% | 2736 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 50,169 psi | 82% | 3045 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,554 psi | 70% | 2881 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,820 psi | 80% | 3081 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,224 psi | 76% | 3094 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,733 psi | 80% | 3081 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,699 psi | 70% | 2907 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,716 psi | 75% | 2979 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,127 psi | 54% | 2749 fps | 95.8% |
| Alliant Reloder-17 | 63.6 gr | 80% | 37,144 psi | 61% | 2884 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,066 psi | 79% | 3071 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,124 psi | 48% | 2651 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,420 psi | 61% | 2897 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,547 psi | 55% | 2841 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,748 psi | 82% | 3054 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,670 psi | 70% | 2913 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 43,091 psi | 71% | 2884 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 43,294 psi | 71% | 2920 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 40,683 psi | 67% | 2913 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 46,789 psi | 77% | 2999 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,676 psi | 83% | 3054 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,574 psi | 50% | 2641 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,065 psi | 77% | 3031 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,888 psi | 70% | 2989 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 44% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,501 psi | 80% | 3002 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,778 psi | 83% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,715 psi | 73% | 2920 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,137 psi | 77% | 2946 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 43,700 psi | 72% | 2917 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,901 psi | 69% | 2861 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,300 psi | 53% | 2690 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 46,891 psi | 77% | 3012 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 49,966 psi | 82% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,385 psi | 81% | 2969 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,788 psi | 74% | 2920 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,854 psi | 61% | 2746 fps | 95.5% |
| Lovex S070 | <<locked>> | 84% | 39,914 psi | 66% | 2838 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 37,565 psi | 62% | 2818 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 48,892 psi | 80% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,545 psi | 81% | 2989 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,092 psi | 74% | 2966 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 49,661 psi | 82% | 3077 fps | 95.8% |
| Norma MRP | <<locked>> | 94% | 41,568 psi | 68% | 3012 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 33,431 psi | 55% | 2736 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,005 psi | 74% | 2982 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 37,246 psi | 61% | 2841 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 45% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,468 psi | 71% | 2900 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,776 psi | 80% | 3097 fps | 99.7% |
| ReloadSwiss RS 60 | 63.6 gr | 80% | 39,508 psi | 65% | 2956 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,083 psi | 54% | 2749 fps | 95.2% |
| ReloadSwiss RS 70 | 66.2 gr | 82% | 34,925 psi | 57% | 2815 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 46,673 psi | 77% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,161 psi | 66% | 2854 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 96% | 46,876 psi | 77% | 3048 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 84% | 43,091 psi | 71% | 2884 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,854 psi | 61% | 2746 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,966 psi | 82% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,788 psi | 74% | 2920 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,914 psi | 66% | 2838 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,147 psi | 68% | 2907 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,894 psi | 84% | 3038 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,501 psi | 80% | 3009 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,038 psi | 82% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,061 psi | 69% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,147 psi | 68% | 2802 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,427 psi | 76% | 3041 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 49,617 psi | 81% | 2923 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,618 psi | 83% | 3028 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,640 psi | 67% | 2858 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,965 psi | 49% | 2684 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 44,788 psi | 74% | 2972 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 50,488 psi | 83% | 2913 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,630 psi | 77% | 2907 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,920 psi | 77% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,841 psi | 64% | 2785 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,853 psi | 57% | 2740 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 98% | 43,918 psi | 72% | 2940 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 45,397 psi | 75% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,403 psi | 56% | 2740 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 31,720 psi | 52% | 2736 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,360 psi | 56% | 2710 fps | 98.2% |
| Winchester 760 | <<locked>> | 84% | 40,683 psi | 67% | 2913 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,514 psi | 45% | 2674 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,472 psi | 80% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,659 psi | 78% | 3015 fps | 95.4% |
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 91 powders for .300 Blaser Mag. loaded with the .308 | 150gr | Lapua Mega. Alliant Reloder-26 delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,264 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, 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-19, 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Blaser 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.