Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 150gr | Hornady ECX bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Vihtavuori N560.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 54,244 psi | 89% | 3123 fps | 98.7% |
| Accurate 3100 | <<locked>> | 98% | 52,866 psi | 87% | 3166 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 53,388 psi | 88% | 3110 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,810 psi | 90% | 3228 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 54,433 psi | 89% | 3323 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 53,751 psi | 88% | 3146 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 52,417 psi | 86% | 3212 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 98% | 53,650 psi | 88% | 3264 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 52,475 psi | 86% | 3209 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,650 psi | 90% | 3173 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,650 psi | 90% | 3196 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 52,127 psi | 86% | 3232 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,156 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 51,808 psi | 85% | 3199 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,881 psi | 87% | 3261 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,679 psi | 88% | 3248 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,383 psi | 76% | 3169 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,795 psi | 88% | 3337 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,837 psi | 85% | 3241 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 51,764 psi | 85% | 3130 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,881 psi | 87% | 3261 fps | 98.1% |
| Bofors RP7 | <<locked>> | 88% | 54,766 psi | 90% | 3173 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 52,185 psi | 86% | 3146 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 53,316 psi | 88% | 3222 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 86% | 52,982 psi | 87% | 3179 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 96% | 53,780 psi | 88% | 3205 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,750 psi | 87% | 3189 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 52,489 psi | 86% | 3150 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,339 psi | 74% | 3205 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,635 psi | 88% | 3258 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 60% | 2034 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,069 psi | 87% | 3127 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 52,576 psi | 86% | 3150 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,084 psi | 87% | 3146 fps | 99% |
| IMR 4831 | <<locked>> | 90% | 51,808 psi | 85% | 3159 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,938 psi | 85% | 3133 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,897 psi | 90% | 3304 fps | 97.3% |
| Lovex S062 | <<locked>> | 82% | 53,316 psi | 88% | 3120 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,229 psi | 87% | 3143 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 54,505 psi | 89% | 3186 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,833 psi | 77% | 3061 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 53,954 psi | 89% | 3179 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,316 psi | 88% | 3202 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 52,547 psi | 86% | 3287 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 53,534 psi | 88% | 3212 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,071 psi | 90% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,605 psi | 85% | 3251 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 90% | 52,431 psi | 86% | 3209 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,748 psi | 82% | 3179 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 61% | 2080 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 52,141 psi | 86% | 3127 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,591 psi | 86% | 3245 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,868 psi | 90% | 3251 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,476 psi | 88% | 3281 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,687 psi | 75% | 3202 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 84% | 52,011 psi | 85% | 3127 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,027 psi | 89% | 3182 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 54,520 psi | 90% | 3245 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 54,766 psi | 90% | 3173 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,229 psi | 87% | 3143 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 53,316 psi | 88% | 3120 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,505 psi | 89% | 3186 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,606 psi | 88% | 3189 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,953 psi | 87% | 3012 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 52,750 psi | 87% | 3087 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,056 psi | 89% | 3238 fps | 98.2% |
| Somchem S355 | <<locked>> | 84% | 52,025 psi | 85% | 3123 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 53,214 psi | 87% | 3215 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 51,590 psi | 85% | 3156 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 86% | 53,345 psi | 88% | 3097 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 51,953 psi | 85% | 3146 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,592 psi | 90% | 3189 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 54,201 psi | 89% | 3100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,795 psi | 90% | 3209 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 52,170 psi | 86% | 3215 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,794 psi | 87% | 3278 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 51,605 psi | 85% | 3107 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,505 psi | 88% | 3225 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,530 psi | 81% | 3320 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 51,750 psi | 85% | 3146 fps | 97.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 50,720 psi | 83% | 3061 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,606 psi | 57% | 2789 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 50,009 psi | 82% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,363 psi | 63% | 2904 fps | 98.3% |
| Accurate High Country | <<locked>> | 92% | 47,123 psi | 77% | 3186 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 47,297 psi | 78% | 3031 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,743 psi | 70% | 3015 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 46,775 psi | 77% | 3127 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,917 psi | 70% | 3015 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,848 psi | 79% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,256 psi | 84% | 3136 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,434 psi | 61% | 2920 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,772 psi | 70% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,424 psi | 70% | 3005 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,018 psi | 71% | 3061 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,238 psi | 45% | 2635 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,170 psi | 54% | 2835 fps | 95.5% |
| Alliant Reloder-26 | 76.6 gr | 82% | 31,546 psi | 52% | 2828 fps | 95.6% |
| Bofors RP15 | <<locked>> | 94% | 42,424 psi | 70% | 3045 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,225 psi | 79% | 3068 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,018 psi | 71% | 3061 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,308 psi | 69% | 2927 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,704 psi | 80% | 3081 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,509 psi | 67% | 2959 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,366 psi | 71% | 2986 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 94% | 50,314 psi | 83% | 3143 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,110 psi | 81% | 3117 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,853 psi | 57% | 2799 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,453 psi | 70% | 3133 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,552 psi | 65% | 2966 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 44% | 1821 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,748 psi | 82% | 3071 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 38,000 psi | 62% | 2844 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,772 psi | 72% | 2959 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 36,811 psi | 60% | 2851 fps | 98% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,704 psi | 80% | 3074 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 96% | 47,747 psi | 78% | 3163 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 49,980 psi | 82% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,249 psi | 68% | 2904 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,407 psi | 65% | 2881 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 33,504 psi | 55% | 2759 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,618 psi | 83% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,192 psi | 71% | 3002 fps | 95.3% |
| Norma MRP | 79.7 gr | 88% | 39,204 psi | 64% | 3005 fps | 96% |
| Norma URP | <<locked>> | 80% | 38,145 psi | 63% | 2900 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 51,256 psi | 84% | 3143 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,921 psi | 79% | 3176 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,057 psi | 61% | 2884 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 94% | 39,581 psi | 65% | 2963 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 45% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,791 psi | 80% | 3068 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,527 psi | 75% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,334 psi | 63% | 2923 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,144 psi | 61% | 2930 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,320 psi | 65% | 3041 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 45,339 psi | 74% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,427 psi | 78% | 3058 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 41,452 psi | 68% | 2986 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,308 psi | 69% | 2927 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,249 psi | 68% | 2904 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 49,980 psi | 82% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,407 psi | 65% | 2881 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,760 psi | 77% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,630 psi | 77% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,292 psi | 66% | 2841 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,060 psi | 67% | 2976 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,730 psi | 75% | 3009 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,635 psi | 57% | 2851 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,349 psi | 65% | 2900 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 43,613 psi | 72% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,682 psi | 65% | 2900 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,655 psi | 68% | 2943 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,720 psi | 83% | 3045 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,102 psi | 64% | 2900 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,066 psi | 49% | 2717 fps | 96.1% |
| Vihtavuori N560 | 85.2 gr | 94% | 49,168 psi | 81% | 3205 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,943 psi | 64% | 2867 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,669 psi | 67% | 2963 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,614 psi | 42% | 2657 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,582 psi | 68% | 2946 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 80 powders for .300 Lapua Mag. loaded with the .308 | 150gr | Hornady ECX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,337 fps; across all powders the maximum-charge window runs from 2,034 fps to 3,337 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, 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. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, Vihtavuori N560 rank at the top here: for .300 Lapua 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.