Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:225 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:1:15.5
Load data in caliber .338 Norma Mag. with .338 | 225gr | Sierra Pro-Hunter bullet and 87 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% | 56,753 psi | 89% | 2743 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 56,101 psi | 88% | 2799 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,681 psi | 89% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,201 psi | 85% | 2785 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 57,537 psi | 90% | 2943 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 54,578 psi | 86% | 2884 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 56,217 psi | 88% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,911 psi | 86% | 2831 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 98% | 56,405 psi | 88% | 2887 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 2615 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,187 psi | 86% | 2828 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,348 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,435 psi | 90% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,984 psi | 86% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,275 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,476 psi | 85% | 2822 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,898 psi | 88% | 2884 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 2858 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,921 psi | 77% | 2802 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,217 psi | 90% | 2949 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 2864 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 54,679 psi | 86% | 2743 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,860 psi | 70% | 2730 fps | 96.5% |
| Bofors RP5 | <<locked>> | 98% | 55,898 psi | 88% | 2884 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 57,290 psi | 90% | 2785 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,414 psi | 76% | 2746 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 54,824 psi | 86% | 2759 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,173 psi | 88% | 2838 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 55,419 psi | 87% | 2792 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 96% | 56,420 psi | 88% | 2828 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,201 psi | 87% | 2808 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,332 psi | 87% | 2766 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2851 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 56,463 psi | 88% | 2874 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1736 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,564 psi | 87% | 2736 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,201 psi | 87% | 2772 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,477 psi | 87% | 2759 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 54,679 psi | 86% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,653 psi | 90% | 2812 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2920 fps | 98.5% |
| Lovex S062 | <<locked>> | 82% | 55,999 psi | 88% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,825 psi | 87% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,232 psi | 90% | 2799 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 2707 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 56,724 psi | 89% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,854 psi | 88% | 2822 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 55,622 psi | 87% | 2907 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 56,318 psi | 88% | 2818 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,667 psi | 90% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,447 psi | 85% | 2881 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 55,056 psi | 86% | 2825 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,431 psi | 82% | 2815 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,679 psi | 86% | 2749 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,622 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,128 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,173 psi | 88% | 2890 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,225 psi | 76% | 2848 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,711 psi | 90% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,926 psi | 86% | 2740 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,492 psi | 89% | 2802 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 96% | 57,392 psi | 90% | 2861 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 57,290 psi | 90% | 2785 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,825 psi | 87% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,999 psi | 88% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,232 psi | 90% | 2799 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,449 psi | 88% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,361 psi | 87% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,274 psi | 87% | 2713 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,927 psi | 89% | 2858 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 54,607 psi | 86% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,549 psi | 85% | 2740 fps | 97.2% |
| Somchem S365 | <<locked>> | 92% | 56,347 psi | 88% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,389 psi | 85% | 2785 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 56,028 psi | 88% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,752 psi | 86% | 2762 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 2812 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 56,623 psi | 89% | 2707 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,580 psi | 90% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,463 psi | 87% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,695 psi | 87% | 2900 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2815 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,157 psi | 85% | 2726 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,376 psi | 88% | 2841 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,924 psi | 83% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,418 psi | 85% | 2779 fps | 98.8% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 53,142 psi | 83% | 2687 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 30,516 psi | 48% | 2316 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 53,142 psi | 83% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,249 psi | 65% | 2569 fps | 99.5% |
| Accurate High Country | <<locked>> | 88% | 43,381 psi | 68% | 2697 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 92% | 47,253 psi | 74% | 2759 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 49,690 psi | 78% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,581 psi | 62% | 2552 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 43,120 psi | 68% | 2651 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 34,301 psi | 54% | 2500 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,842 psi | 62% | 2552 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,531 psi | 79% | 2677 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,896 psi | 84% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,711 psi | 62% | 2579 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,426 psi | 71% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,436 psi | 62% | 2546 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,943 psi | 63% | 2598 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,341 psi | 46% | 2346 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,227 psi | 49% | 2411 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,618 psi | 50% | 2461 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 39,407 psi | 62% | 2585 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,227 psi | 80% | 2694 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,945 psi | 66% | 2671 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 39,943 psi | 63% | 2598 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,744 psi | 70% | 2579 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 42,337 psi | 66% | 2628 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 51,445 psi | 81% | 2710 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,062 psi | 67% | 2615 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 45,803 psi | 72% | 2631 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 46,035 psi | 72% | 2657 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 45,194 psi | 71% | 2641 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,289 psi | 58% | 2467 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,014 psi | 58% | 2602 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,989 psi | 66% | 2628 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 43% | 1552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,286 psi | 82% | 2687 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,219 psi | 63% | 2510 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,977 psi | 72% | 2605 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 39,421 psi | 62% | 2520 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,991 psi | 71% | 2602 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 44,150 psi | 69% | 2687 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,562 psi | 82% | 2680 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,569 psi | 68% | 2556 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 41,858 psi | 66% | 2543 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 31,923 psi | 50% | 2352 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 53,229 psi | 83% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,813 psi | 62% | 2536 fps | 95.3% |
| Norma MRP | <<locked>> | 82% | 34,011 psi | 53% | 2490 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,712 psi | 64% | 2559 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,940 psi | 85% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,888 psi | 69% | 2694 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 39,465 psi | 62% | 2549 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 36,405 psi | 57% | 2513 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 44% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,213 psi | 80% | 2694 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,196 psi | 76% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,988 psi | 64% | 2585 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,537 psi | 62% | 2598 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,260 psi | 57% | 2582 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 54,375 psi | 85% | 2690 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,211 psi | 76% | 2641 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,787 psi | 69% | 2589 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 38,609 psi | 61% | 2533 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,744 psi | 70% | 2579 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,569 psi | 68% | 2556 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 52,562 psi | 82% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,858 psi | 66% | 2543 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,371 psi | 77% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,965 psi | 77% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,612 psi | 67% | 2503 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,261 psi | 60% | 2526 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,269 psi | 76% | 2638 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,848 psi | 75% | 2635 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 37,362 psi | 59% | 2520 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,738 psi | 58% | 2461 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 46,122 psi | 72% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,134 psi | 66% | 2559 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 36,216 psi | 57% | 2444 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,229 psi | 83% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,611 psi | 65% | 2559 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 32,793 psi | 51% | 2421 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 45,179 psi | 71% | 2717 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 44,773 psi | 70% | 2697 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,162 psi | 65% | 2523 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,062 psi | 67% | 2615 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,947 psi | 41% | 2333 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,493 psi | 60% | 2500 fps | 95.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 87 powders for .338 Norma Mag. loaded with the .338 | 225gr | Sierra Pro-Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,736 fps to 2,949 fps. ADI AR 2225 gives the best case fill at 100 %, and 87 of the 87 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 225.0 gr projectile in 0.338" calls for a 1:15.5 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.