Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 175gr | Barnes X S bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 52,199 psi | 86% | 3054 fps | 98.9% |
| Accurate 4350 | <<locked>> | 88% | 53,708 psi | 88% | 3110 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 82% | 51,938 psi | 85% | 3025 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 94% | 53,751 psi | 88% | 3133 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 53,185 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,577 psi | 88% | 3159 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,694 psi | 90% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,345 psi | 88% | 3123 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,607 psi | 90% | 3186 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 51,866 psi | 85% | 3127 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,298 psi | 79% | 3100 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 51,822 psi | 85% | 3202 fps | 99.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,476 psi | 88% | 3163 fps | 97% |
| Bofors RP3 | <<locked>> | 82% | 54,360 psi | 89% | 3077 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,607 psi | 90% | 3186 fps | 97.4% |
| Bofors RP7 | <<locked>> | 86% | 53,316 psi | 88% | 3045 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,302 psi | 89% | 3084 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 88% | 54,998 psi | 90% | 3150 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 86% | 54,476 psi | 89% | 3104 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,114 psi | 89% | 3084 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,369 psi | 78% | 3130 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 88% | 55,114 psi | 90% | 3179 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 61% | 1998 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,708 psi | 90% | 3064 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,070 psi | 89% | 3077 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,462 psi | 89% | 3071 fps | 98.4% |
| IMR 4831 | <<locked>> | 90% | 53,795 psi | 88% | 3097 fps | 99.9% |
| Lovex S065 | <<locked>> | 86% | 52,127 psi | 86% | 3025 fps | 99% |
| Lovex S070 | <<locked>> | 88% | 53,447 psi | 88% | 3064 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,879 psi | 82% | 3012 fps | 98.5% |
| Norma 204 | <<locked>> | 90% | 54,911 psi | 90% | 3130 fps | 97.1% |
| Norma MRP | <<locked>> | 96% | 54,273 psi | 89% | 3215 fps | 98.6% |
| Norma URP | <<locked>> | 88% | 52,040 psi | 85% | 3087 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 90% | 54,201 psi | 89% | 3140 fps | 99.1% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,648 psi | 85% | 3107 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 62% | 2044 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,853 psi | 88% | 3061 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,070 psi | 89% | 3179 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,200 psi | 87% | 3123 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,853 psi | 90% | 3202 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,674 psi | 78% | 3123 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 84% | 54,447 psi | 89% | 3071 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 52,779 psi | 87% | 3110 fps | 97% |
| Rottweil R 907 | <<locked>> | 86% | 53,316 psi | 88% | 3045 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 52,127 psi | 86% | 3025 fps | 99% |
| Shooters World SW4350 | <<locked>> | 88% | 53,447 psi | 88% | 3064 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 51,924 psi | 85% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,578 psi | 90% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,766 psi | 90% | 3022 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 52,330 psi | 86% | 3104 fps | 96.9% |
| Somchem S355 | <<locked>> | 84% | 54,172 psi | 89% | 3064 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 54,955 psi | 90% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,693 psi | 88% | 3087 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 84% | 51,938 psi | 85% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,751 psi | 88% | 3077 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 98% | 52,837 psi | 87% | 3054 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 88% | 53,200 psi | 87% | 3084 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 96% | 54,650 psi | 90% | 3156 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,098 psi | 87% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 51,895 psi | 85% | 3094 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,923 psi | 84% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,359 psi | 88% | 3074 fps | 96.9% |
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 3100 | <<locked>> | 86% | 37,913 psi | 62% | 2766 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 41,394 psi | 68% | 2874 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 49,008 psi | 80% | 2972 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 47,326 psi | 78% | 3009 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,966 psi | 82% | 3002 fps | 100% |
| Alliant Reloder-16 | 77.8 gr | 80% | 39,276 psi | 64% | 2867 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,628 psi | 73% | 3005 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 47,079 psi | 77% | 3002 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 47,892 psi | 79% | 3061 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,878 psi | 49% | 2618 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 35,607 psi | 58% | 2792 fps | 95.1% |
| Alliant Reloder-26 | 88.1 gr | 82% | 34,287 psi | 56% | 2802 fps | 95.5% |
| Bofors RP15 | <<locked>> | 96% | 47,297 psi | 78% | 3045 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,010 psi | 84% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 47,892 psi | 79% | 3061 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,614 psi | 73% | 2877 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 51,024 psi | 84% | 3028 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 42,583 psi | 70% | 2907 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,194 psi | 74% | 2923 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,115 psi | 61% | 2759 fps | 98.6% |
| Hodgdon Retumbo | <<locked>> | 98% | 44,353 psi | 73% | 3058 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,626 psi | 68% | 2910 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 45% | 1788 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,561 psi | 85% | 3009 fps | 99.9% |
| IMR 4350 | <<locked>> | 82% | 42,525 psi | 70% | 2851 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,600 psi | 75% | 2900 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 39,450 psi | 65% | 2815 fps | 97.8% |
| Lovex S065 | <<locked>> | 80% | 43,642 psi | 72% | 2858 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 42,047 psi | 69% | 2841 fps | 96% |
| Lovex S071 | <<locked>> | 90% | 36,854 psi | 61% | 2740 fps | 95.1% |
| Norma 204 | <<locked>> | 86% | 48,037 psi | 79% | 3002 fps | 95.4% |
| Norma MRP | 91.7 gr | 88% | 41,524 psi | 68% | 2953 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 40,538 psi | 67% | 2858 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 80% | 39,262 psi | 64% | 2835 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 44,730 psi | 73% | 2969 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 46% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,604 psi | 83% | 3002 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,181 psi | 77% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,915 psi | 67% | 2884 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,218 psi | 64% | 2881 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 41,698 psi | 68% | 2979 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 48,240 psi | 79% | 2966 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 46,427 psi | 76% | 2989 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,614 psi | 73% | 2877 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,642 psi | 72% | 2858 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 80% | 42,047 psi | 69% | 2841 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,646 psi | 80% | 3009 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,399 psi | 79% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,830 psi | 70% | 2795 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 46,006 psi | 76% | 2982 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,080 psi | 79% | 2959 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 37,173 psi | 61% | 2818 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 41,930 psi | 69% | 2861 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 45,977 psi | 75% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,756 psi | 69% | 2854 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 92% | 43,714 psi | 72% | 2887 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 41,553 psi | 68% | 2858 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,243 psi | 55% | 2710 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,799 psi | 67% | 2815 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 42,728 psi | 70% | 2910 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 28,572 psi | 47% | 2661 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,673 psi | 77% | 2949 fps | 95.2% |
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 78 powders for .338 Lapua Mag. loaded with the .338 | 175gr | Barnes X S. Winchester StaBALL HD delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,251 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 175.0 gr projectile in 0.338" calls for a 1:16.0 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .338 Lapua Mag. with the .338 | 175gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2217, ADI AR 2225 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.