Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 178gr | TWENTY-NINE SILENTIO bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 52,272 psi | 86% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 53,606 psi | 88% | 2959 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 53,577 psi | 88% | 3074 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 54,346 psi | 89% | 3071 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 92% | 54,462 psi | 89% | 3015 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 52,112 psi | 86% | 3012 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,775 psi | 77% | 2904 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,481 psi | 68% | 2861 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,636 psi | 90% | 3012 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,636 psi | 90% | 3012 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,563 psi | 90% | 3018 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 51,982 psi | 85% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,012 psi | 89% | 3002 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 51,967 psi | 85% | 3012 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,055 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,257 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,229 psi | 87% | 3077 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,592 psi | 90% | 3054 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,370 psi | 79% | 2979 fps | 98% |
| Bofors RP5 | <<locked>> | 94% | 51,967 psi | 85% | 3012 fps | 99.1% |
| Bofors RP7 | <<locked>> | 84% | 53,069 psi | 87% | 2907 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,532 psi | 85% | 2995 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 84% | 51,953 psi | 85% | 2959 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,607 psi | 90% | 2969 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 52,330 psi | 86% | 2953 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,665 psi | 90% | 2992 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,810 psi | 90% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,213 psi | 84% | 3110 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 51,982 psi | 85% | 2992 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 61% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,418 psi | 89% | 2946 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,563 psi | 90% | 2933 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 54,056 psi | 89% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 53,563 psi | 88% | 2940 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 53,592 psi | 88% | 3051 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 55,013 psi | 90% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 53,229 psi | 87% | 2927 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,330 psi | 88% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 86% | 51,692 psi | 85% | 2943 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 37,014 psi | 61% | 2779 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 51,779 psi | 85% | 3035 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 52,388 psi | 86% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,099 psi | 89% | 3068 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 54,665 psi | 90% | 3005 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 52,272 psi | 86% | 3002 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 62% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 53,737 psi | 88% | 2986 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 51,851 psi | 85% | 3009 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,793 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,630 psi | 77% | 2979 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 82% | 54,201 psi | 89% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 52,373 psi | 86% | 2927 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 92% | 53,577 psi | 88% | 2992 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 53,069 psi | 87% | 2907 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,013 psi | 90% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 53,229 psi | 87% | 2927 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,230 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,317 psi | 89% | 2881 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 53,142 psi | 87% | 2989 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 53,809 psi | 88% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 53,766 psi | 88% | 2917 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 52,344 psi | 86% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,128 psi | 89% | 2966 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 55,042 psi | 90% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,027 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 53,621 psi | 88% | 2943 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 53,330 psi | 88% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 51,895 psi | 85% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 51,793 psi | 85% | 3028 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,911 psi | 90% | 3061 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 53,548 psi | 88% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,156 psi | 86% | 2963 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,853 psi | 88% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,940 psi | 89% | 2959 fps | 99.2% |
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 3100 | <<locked>> | 80% | 32,576 psi | 53% | 2530 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 43,845 psi | 72% | 2792 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 40,379 psi | 66% | 2812 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 88% | 43,903 psi | 72% | 2877 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 36,622 psi | 60% | 2657 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 42,656 psi | 70% | 2825 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 40,944 psi | 67% | 2779 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 32,082 psi | 53% | 2608 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,970 psi | 61% | 2661 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,970 psi | 61% | 2661 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,901 psi | 69% | 2795 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,312 psi | 79% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,637 psi | 60% | 2654 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,086 psi | 61% | 2707 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,198 psi | 51% | 2556 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,196 psi | 48% | 2516 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,794 psi | 55% | 2690 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 36,912 psi | 61% | 2700 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 39,407 psi | 65% | 2792 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 37,086 psi | 61% | 2707 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 46,731 psi | 77% | 2795 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 39,247 psi | 64% | 2743 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 45,455 psi | 75% | 2841 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 48,138 psi | 79% | 2858 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 42,641 psi | 70% | 2772 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,744 psi | 73% | 2815 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,581 psi | 65% | 2680 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,912 psi | 61% | 2782 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,802 psi | 74% | 2861 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 45% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,264 psi | 69% | 2723 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,182 psi | 79% | 2822 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 41,684 psi | 68% | 2736 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,684 psi | 68% | 2713 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 40,886 psi | 67% | 2799 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 45,687 psi | 75% | 2769 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 43,932 psi | 72% | 2756 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 29,892 psi | 49% | 2454 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 42,061 psi | 69% | 2756 fps | 96.8% |
| Norma 217 | <<locked>> | 98% | 34,737 psi | 57% | 2720 fps | 96% |
| Norma MRP | 69.4 gr | 80% | 33,924 psi | 56% | 2657 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 42,960 psi | 71% | 2776 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 40,698 psi | 67% | 2805 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 41,814 psi | 69% | 2772 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 33,692 psi | 55% | 2615 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 46% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,569 psi | 72% | 2812 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,916 psi | 69% | 2828 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,765 psi | 55% | 2694 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 43,308 psi | 71% | 2907 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 50,691 psi | 83% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,611 psi | 67% | 2697 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 35,911 psi | 59% | 2638 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 46,731 psi | 77% | 2795 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,687 psi | 75% | 2769 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 43,932 psi | 72% | 2756 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,140 psi | 84% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,715 psi | 73% | 2717 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,578 psi | 58% | 2631 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 50,633 psi | 83% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,077 psi | 72% | 2743 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 39,871 psi | 65% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,477 psi | 60% | 2621 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 48,385 psi | 79% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,512 psi | 73% | 2776 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 35,998 psi | 59% | 2605 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 43,845 psi | 72% | 2776 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 35,041 psi | 58% | 2638 fps | 99.2% |
| Vihtavuori N560 | 74.6 gr | 86% | 42,090 psi | 69% | 2835 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 92% | 41,829 psi | 69% | 2818 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,424 psi | 71% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,658 psi | 75% | 2841 fps | 99% |
| Winchester StaBALL HD | 68.6 gr | 80% | 27,644 psi | 45% | 2562 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,159 psi | 63% | 2661 fps | 95.8% |
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 74 powders for .300 Lapua Mag. loaded with the .308 | 178gr | TWENTY-NINE SILENTIO. Winchester StaBALL HD delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,127 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 178.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Lapua Mag. with the .308 | 178gr | TWENTY-NINE SILENTIO 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.