Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 191gr | TWENTY-NINE ERTP bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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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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 2700 | <<locked>> | 82% | 53,403 psi | 88% | 2907 fps | 98.1% |
| Accurate 3100 | <<locked>> | 98% | 51,503 psi | 85% | 2943 fps | 99.2% |
| Accurate 4064 | <<locked>> | 82% | 52,779 psi | 87% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,548 psi | 88% | 3002 fps | 99.9% |
| Accurate High Country | <<locked>> | 96% | 52,721 psi | 87% | 3084 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 52,692 psi | 87% | 2927 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,636 psi | 90% | 3045 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,578 psi | 90% | 3035 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,578 psi | 90% | 3035 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,621 psi | 88% | 2953 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,708 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,259 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 51,793 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,838 psi | 88% | 3025 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,013 psi | 90% | 3091 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,909 psi | 85% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,078 psi | 74% | 2936 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,909 psi | 85% | 3100 fps | 99.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,299 psi | 83% | 3005 fps | 96.9% |
| Bofors RP3 | <<locked>> | 84% | 54,288 psi | 89% | 2969 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,013 psi | 90% | 3091 fps | 98% |
| Bofors RP7 | <<locked>> | 88% | 53,766 psi | 88% | 2949 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 54,679 psi | 90% | 2982 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 51,996 psi | 85% | 2992 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 86% | 51,938 psi | 85% | 2956 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,491 psi | 89% | 2982 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 51,996 psi | 85% | 3022 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,361 psi | 60% | 1893 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,214 psi | 86% | 2910 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,592 psi | 90% | 2943 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 54,882 psi | 90% | 2982 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,098 psi | 86% | 2923 fps | 98.5% |
| IMR 4831 | <<locked>> | 92% | 54,027 psi | 89% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,143 psi | 89% | 2966 fps | 95.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,229 psi | 87% | 3058 fps | 96.3% |
| Lovex S062 | <<locked>> | 82% | 52,518 psi | 86% | 2910 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,344 psi | 86% | 2923 fps | 99.4% |
| Lovex S070 | <<locked>> | 90% | 53,447 psi | 88% | 2963 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,876 psi | 75% | 2848 fps | 98.3% |
| Norma 203B | <<locked>> | 82% | 53,069 psi | 87% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 90% | 51,909 psi | 85% | 2972 fps | 97% |
| Norma MRP | <<locked>> | 98% | 54,650 psi | 90% | 3117 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 52,243 psi | 86% | 2986 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 53,679 psi | 88% | 2982 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,722 psi | 88% | 3077 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 92% | 54,665 psi | 90% | 3038 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,109 psi | 79% | 2943 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 61% | 1936 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,694 psi | 90% | 2966 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,042 psi | 90% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,330 psi | 88% | 3018 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 51,851 psi | 85% | 3045 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,208 psi | 73% | 2956 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 54,331 psi | 89% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,520 psi | 90% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,736 psi | 87% | 2953 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 96% | 53,214 psi | 87% | 3015 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 88% | 53,766 psi | 88% | 2949 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,344 psi | 86% | 2923 fps | 99.4% |
| Shooters World Precision | <<locked>> | 82% | 52,518 psi | 86% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,447 psi | 88% | 2963 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,562 psi | 86% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,127 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 51,692 psi | 85% | 2871 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,750 psi | 87% | 3009 fps | 97.6% |
| Somchem S355 | <<locked>> | 86% | 54,418 psi | 89% | 2963 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 51,619 psi | 85% | 2992 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,795 psi | 88% | 2989 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 82% | 54,752 psi | 90% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,839 psi | 90% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,315 psi | 86% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,360 psi | 89% | 2982 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,084 psi | 87% | 2963 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 53,229 psi | 87% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,490 psi | 88% | 2986 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 54,302 psi | 89% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,897 psi | 90% | 3100 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,882 psi | 88% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,199 psi | 86% | 2995 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,021 psi | 77% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,056 psi | 89% | 2982 fps | 97.6% |
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 2700 | <<locked>> | 80% | 49,922 psi | 82% | 2848 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 36,622 psi | 60% | 2654 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,429 psi | 81% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,840 psi | 62% | 2703 fps | 97.8% |
| Accurate High Country | 92.9 gr | 94% | 49,052 psi | 81% | 3015 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 46,644 psi | 77% | 2822 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 44,759 psi | 73% | 2858 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,933 psi | 74% | 2858 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,933 psi | 74% | 2858 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,239 psi | 78% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,401 psi | 83% | 2920 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,753 psi | 60% | 2713 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,814 psi | 69% | 2844 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,440 psi | 73% | 2851 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,817 psi | 74% | 2904 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,948 psi | 44% | 2448 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,896 psi | 57% | 2694 fps | 95.7% |
| Alliant Reloder-26 | 85.5 gr | 84% | 33,243 psi | 55% | 2690 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 44,193 psi | 73% | 2884 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 47,543 psi | 78% | 2858 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,817 psi | 74% | 2904 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 41,814 psi | 69% | 2723 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,848 psi | 79% | 2867 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 39,798 psi | 65% | 2749 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 42,641 psi | 70% | 2772 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,287 psi | 56% | 2602 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 82% | 41,684 psi | 68% | 2822 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,122 psi | 45% | 1693 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,066 psi | 81% | 2858 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,242 psi | 84% | 2887 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 40,001 psi | 66% | 2700 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,207 psi | 71% | 2753 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 36,332 psi | 60% | 2654 fps | 97.5% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,792 psi | 83% | 2910 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 49,748 psi | 82% | 2992 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 49,226 psi | 81% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,683 psi | 67% | 2700 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 39,001 psi | 64% | 2680 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 35,331 psi | 58% | 2621 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 49,748 psi | 82% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,295 psi | 74% | 2848 fps | 95.3% |
| Norma MRP | 87 gr | 88% | 38,435 psi | 63% | 2789 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,608 psi | 62% | 2697 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,125 psi | 82% | 2923 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 50,067 psi | 82% | 3009 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 36,521 psi | 60% | 2680 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 41,524 psi | 68% | 2812 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 45% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,848 psi | 79% | 2848 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,411 psi | 73% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,565 psi | 62% | 2717 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,477 psi | 60% | 2720 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,220 psi | 68% | 2884 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,155 psi | 84% | 2871 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,831 psi | 74% | 2805 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 49,385 psi | 81% | 2894 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 43,439 psi | 71% | 2831 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 41,814 psi | 69% | 2723 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,683 psi | 67% | 2700 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 49,226 psi | 81% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,001 psi | 64% | 2680 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,006 psi | 76% | 2858 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,006 psi | 76% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,943 psi | 66% | 2644 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,033 psi | 71% | 2825 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 44,991 psi | 74% | 2799 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,084 psi | 56% | 2654 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 41,365 psi | 68% | 2756 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 51,401 psi | 84% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,590 psi | 85% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,091 psi | 71% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,972 psi | 64% | 2697 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 43,584 psi | 72% | 2792 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 49,821 psi | 82% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,421 psi | 63% | 2697 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,747 psi | 49% | 2533 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 96% | 51,184 psi | 84% | 3038 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,247 psi | 63% | 2667 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 39,798 psi | 65% | 2749 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,282 psi | 45% | 2539 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,598 psi | 72% | 2799 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 81 powders for .338 Lapua Mag. loaded with the .338 | 191gr | TWENTY-NINE ERTP. Norma MRP delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,117 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 81 of the 81 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 191.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, Alliant Reloder-23, 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, Accurate High Country, Norma MRP rank at the top here: for .338 Lapua Mag. with the .338 | 191gr | TWENTY-NINE ERTP 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.