Load Specifications
Bullet Manufacturer:Lapua
Bullet Weight:231 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Norma Mag. load data
Case Length (l3):2.49"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:105.4 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:14.5
Load data in caliber .338 Norma Mag. with .338 | 231gr | Lapua Naturalis bullet and 88 powders. The key underlying parameters are shown in the table above.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 56,666 psi | 89% | 2713 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 55,796 psi | 87% | 2766 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,072 psi | 88% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,725 psi | 90% | 2805 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 57,566 psi | 90% | 2917 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 96% | 54,578 psi | 86% | 2858 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 56,188 psi | 88% | 2723 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,940 psi | 86% | 2805 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 98% | 56,507 psi | 89% | 2861 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2589 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,216 psi | 87% | 2802 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,216 psi | 87% | 2802 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,232 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,290 psi | 90% | 2766 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,042 psi | 86% | 2808 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,318 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,462 psi | 85% | 2792 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,927 psi | 88% | 2854 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 2828 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2776 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,276 psi | 90% | 2917 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2835 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 54,375 psi | 85% | 2710 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2700 fps | 96.8% |
| Bofors RP5 | <<locked>> | 98% | 55,927 psi | 88% | 2854 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 57,145 psi | 90% | 2756 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,370 psi | 76% | 2723 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,636 psi | 86% | 2730 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,144 psi | 88% | 2808 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 55,434 psi | 87% | 2766 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 96% | 56,521 psi | 89% | 2802 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,245 psi | 87% | 2785 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,303 psi | 87% | 2733 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,877 psi | 75% | 2822 fps | 99% |
| Hodgdon Superformance | <<locked>> | 88% | 56,565 psi | 89% | 2844 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,709 psi | 58% | 1716 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,492 psi | 87% | 2703 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,158 psi | 86% | 2743 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,448 psi | 87% | 2733 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 54,476 psi | 85% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,696 psi | 90% | 2785 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 98% | 53,954 psi | 85% | 2835 fps | 98.2% |
| Lovex S062 | <<locked>> | 82% | 55,782 psi | 87% | 2697 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,622 psi | 87% | 2726 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,058 psi | 89% | 2772 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,530 psi | 78% | 2674 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 56,579 psi | 89% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,912 psi | 88% | 2792 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 55,680 psi | 87% | 2877 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 56,275 psi | 88% | 2789 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,667 psi | 90% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,505 psi | 85% | 2854 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 55,085 psi | 86% | 2792 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2789 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 59% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,563 psi | 86% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,753 psi | 87% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,969 psi | 85% | 2776 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,289 psi | 88% | 2858 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,153 psi | 75% | 2822 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 82% | 57,464 psi | 90% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,636 psi | 86% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,507 psi | 89% | 2776 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 96% | 57,377 psi | 90% | 2835 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 57,145 psi | 90% | 2756 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,622 psi | 87% | 2726 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,782 psi | 87% | 2697 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,058 psi | 89% | 2772 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,405 psi | 88% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,259 psi | 87% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,085 psi | 86% | 2684 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,913 psi | 89% | 2828 fps | 99.4% |
| Somchem S355 | <<locked>> | 84% | 54,360 psi | 85% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,476 psi | 85% | 2717 fps | 97.5% |
| Somchem S365 | <<locked>> | 92% | 56,304 psi | 88% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,244 psi | 85% | 2753 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 55,854 psi | 88% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,694 psi | 86% | 2733 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 2785 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 82% | 56,492 psi | 89% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,450 psi | 90% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,245 psi | 87% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,738 psi | 87% | 2871 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,169 psi | 80% | 2785 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,186 psi | 85% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,333 psi | 88% | 2812 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,156 psi | 83% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,418 psi | 85% | 2753 fps | 99% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 52,953 psi | 83% | 2657 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 29,834 psi | 47% | 2280 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 52,533 psi | 82% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,756 psi | 64% | 2536 fps | 99.6% |
| Accurate High Country | <<locked>> | 86% | 40,335 psi | 63% | 2612 fps | 95% |
| Accurate MAGPRO | <<locked>> | 92% | 47,152 psi | 74% | 2730 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 49,588 psi | 78% | 2628 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,392 psi | 62% | 2523 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 90% | 42,946 psi | 67% | 2625 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 33,939 psi | 53% | 2470 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,624 psi | 62% | 2523 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,624 psi | 62% | 2523 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,285 psi | 79% | 2648 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,693 psi | 84% | 2717 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,508 psi | 62% | 2546 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,324 psi | 71% | 2664 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,218 psi | 61% | 2520 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,970 psi | 58% | 2510 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,877 psi | 45% | 2313 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,821 psi | 48% | 2382 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,140 psi | 49% | 2428 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 39,160 psi | 61% | 2556 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,850 psi | 80% | 2661 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,698 psi | 65% | 2641 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 36,970 psi | 58% | 2510 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,425 psi | 70% | 2549 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 42,148 psi | 66% | 2602 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 51,169 psi | 80% | 2677 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,844 psi | 67% | 2585 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 45,672 psi | 72% | 2605 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 90% | 45,963 psi | 72% | 2631 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 45,092 psi | 71% | 2615 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,985 psi | 58% | 2438 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,709 psi | 58% | 2572 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 41,829 psi | 66% | 2602 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 43% | 1532 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,170 psi | 82% | 2657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,987 psi | 63% | 2480 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,832 psi | 72% | 2575 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 39,015 psi | 61% | 2490 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,875 psi | 70% | 2575 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 92% | 44,005 psi | 69% | 2657 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 52,301 psi | 82% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,207 psi | 68% | 2526 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,466 psi | 65% | 2510 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 31,270 psi | 49% | 2316 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,055 psi | 83% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,566 psi | 62% | 2507 fps | 95.6% |
| Norma MRP | <<locked>> | 82% | 33,634 psi | 53% | 2457 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 40,422 psi | 63% | 2530 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,896 psi | 84% | 2726 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,669 psi | 64% | 2602 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,233 psi | 61% | 2520 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 36,071 psi | 57% | 2484 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 44% | 1568 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,024 psi | 80% | 2664 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,167 psi | 75% | 2707 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,640 psi | 64% | 2552 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,305 psi | 62% | 2569 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,489 psi | 52% | 2487 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 54,041 psi | 85% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,805 psi | 75% | 2608 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,642 psi | 68% | 2559 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 84% | 38,319 psi | 60% | 2500 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,425 psi | 70% | 2549 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,207 psi | 68% | 2526 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 52,301 psi | 82% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,466 psi | 65% | 2510 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,211 psi | 77% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,776 psi | 76% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,235 psi | 66% | 2474 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,971 psi | 60% | 2497 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,921 psi | 75% | 2605 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,454 psi | 70% | 2549 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,043 psi | 58% | 2487 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,347 psi | 57% | 2431 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 45,876 psi | 72% | 2539 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,887 psi | 66% | 2526 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,911 psi | 56% | 2415 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 53,040 psi | 83% | 2631 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,292 psi | 65% | 2530 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,271 psi | 51% | 2385 fps | 98.3% |
| Vihtavuori N560 | <<locked>> | 90% | 45,034 psi | 71% | 2690 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 44,512 psi | 70% | 2667 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,973 psi | 64% | 2497 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,844 psi | 67% | 2585 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,425 psi | 40% | 2297 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,247 psi | 60% | 2470 fps | 95.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 88 powders for .338 Norma Mag. loaded with the .338 | 231gr | Lapua Naturalis. Accurate High Country delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,716 fps to 2,917 fps. ADI AR 2225 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 231.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.