Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Sierra MatchKing bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Ramshot Grand.
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% | 55,521 psi | 87% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,217 psi | 90% | 2684 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 57,072 psi | 89% | 2799 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 54,085 psi | 85% | 2743 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 55,172 psi | 86% | 2598 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,288 psi | 85% | 2687 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 55,506 psi | 87% | 2743 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2589 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,234 psi | 65% | 2552 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,418 psi | 85% | 2684 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,318 psi | 88% | 2618 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,360 psi | 85% | 2687 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,448 psi | 87% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,435 psi | 90% | 2726 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,259 psi | 87% | 2736 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,318 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 2717 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,710 psi | 89% | 2799 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,551 psi | 90% | 2703 fps | 96.7% |
| Bofors RP15 | <<locked>> | 98% | 54,244 psi | 85% | 2723 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 57,508 psi | 90% | 2638 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2657 fps | 98.2% |
| Bofors RP5 | <<locked>> | 96% | 55,259 psi | 87% | 2736 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 56,362 psi | 88% | 2638 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,213 psi | 80% | 2674 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 57,377 psi | 90% | 2654 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,259 psi | 87% | 2684 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 54,549 psi | 85% | 2644 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 94% | 55,608 psi | 87% | 2687 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,578 psi | 86% | 2671 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,708 psi | 86% | 2615 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2776 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 55,695 psi | 87% | 2723 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 58% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,259 psi | 85% | 2625 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,462 psi | 85% | 2612 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 57,609 psi | 90% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,724 psi | 89% | 2667 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 57,130 psi | 90% | 2776 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 54,998 psi | 86% | 2608 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,434 psi | 88% | 2651 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 2618 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,998 psi | 86% | 2674 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 36,796 psi | 58% | 2484 fps | 97.3% |
| Norma MRP | <<locked>> | 94% | 55,216 psi | 87% | 2762 fps | 100% |
| Norma URP | <<locked>> | 88% | 55,666 psi | 87% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,708 psi | 84% | 2736 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 54,375 psi | 85% | 2674 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2736 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,188 psi | 90% | 2644 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,998 psi | 86% | 2687 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,188 psi | 90% | 2707 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,535 psi | 87% | 2736 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,358 psi | 80% | 2776 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,166 psi | 72% | 2661 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 84% | 57,566 psi | 90% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,709 psi | 87% | 2657 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 94% | 56,942 psi | 89% | 2717 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 56,362 psi | 88% | 2638 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,998 psi | 86% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,434 psi | 88% | 2651 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,390 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,537 psi | 90% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,740 psi | 90% | 2612 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,521 psi | 89% | 2713 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 57,188 psi | 90% | 2625 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,305 psi | 90% | 2654 fps | 98.5% |
| Somchem S365 | <<locked>> | 90% | 55,941 psi | 88% | 2671 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,435 psi | 90% | 2690 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 54,911 psi | 86% | 2556 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,508 psi | 90% | 2661 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,840 psi | 89% | 2671 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 56,666 psi | 89% | 2667 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,259 psi | 87% | 2690 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,158 psi | 86% | 2756 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 2733 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2667 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,058 psi | 89% | 2621 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,463 psi | 87% | 2687 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2838 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,334 psi | 90% | 2687 fps | 99.6% |
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 3100 | <<locked>> | 80% | 32,460 psi | 51% | 2251 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 43,642 psi | 68% | 2484 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 40,219 psi | 63% | 2510 fps | 95.8% |
| Accurate MAGPRO | 81.8 gr | 88% | 43,758 psi | 69% | 2569 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 51,909 psi | 81% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,637 psi | 57% | 2369 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 39,784 psi | 62% | 2464 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 40,683 psi | 64% | 2477 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 32,039 psi | 50% | 2333 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,825 psi | 58% | 2369 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,939 psi | 83% | 2572 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,930 psi | 66% | 2490 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,298 psi | 76% | 2598 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,492 psi | 57% | 2362 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,679 psi | 54% | 2362 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,183 psi | 49% | 2280 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,340 psi | 43% | 2192 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,808 psi | 53% | 2402 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,865 psi | 80% | 2598 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 36,825 psi | 58% | 2411 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 53,780 psi | 84% | 2589 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 36,651 psi | 57% | 2438 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 34,679 psi | 54% | 2362 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 46,673 psi | 73% | 2487 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 39,015 psi | 61% | 2444 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 53,925 psi | 85% | 2608 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,455 psi | 71% | 2530 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 48,051 psi | 75% | 2543 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 42,496 psi | 67% | 2470 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,727 psi | 65% | 2454 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,624 psi | 62% | 2385 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,490 psi | 54% | 2428 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 44,527 psi | 70% | 2549 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,337 psi | 66% | 2428 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,095 psi | 75% | 2510 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 41,713 psi | 65% | 2438 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,553 psi | 65% | 2415 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 40,857 psi | 64% | 2500 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 45,658 psi | 72% | 2467 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 44,034 psi | 69% | 2457 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 27,992 psi | 44% | 2139 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 41,989 psi | 66% | 2457 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 32,372 psi | 51% | 2375 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 33,779 psi | 53% | 2369 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 43,062 psi | 67% | 2474 fps | 99.9% |
| Ramshot Grand | 77.8 gr | 86% | 37,753 psi | 59% | 2444 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 41,756 psi | 65% | 2467 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 33,649 psi | 53% | 2336 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,635 psi | 84% | 2595 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,256 psi | 80% | 2638 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,555 psi | 68% | 2503 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,800 psi | 66% | 2516 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,328 psi | 49% | 2343 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,830 psi | 67% | 2595 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 50,749 psi | 80% | 2543 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,567 psi | 64% | 2405 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 35,781 psi | 56% | 2349 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,673 psi | 73% | 2487 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,658 psi | 72% | 2467 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 44,034 psi | 69% | 2457 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,895 psi | 81% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,952 psi | 80% | 2428 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,686 psi | 70% | 2418 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,447 psi | 56% | 2343 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 50,604 psi | 79% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,263 psi | 65% | 2395 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 39,885 psi | 63% | 2438 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,405 psi | 57% | 2336 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 48,457 psi | 76% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,353 psi | 70% | 2467 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,620 psi | 53% | 2270 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 43,845 psi | 69% | 2474 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 35,027 psi | 55% | 2349 fps | 99.4% |
| Vihtavuori N560 | 78.5 gr | 86% | 41,916 psi | 66% | 2530 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 41,582 psi | 65% | 2513 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 44,425 psi | 70% | 2612 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,424 psi | 68% | 2434 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,455 psi | 71% | 2530 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,630 psi | 43% | 2290 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,462 psi | 56% | 2316 fps | 95.3% |
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 82 powders for .338 Norma Mag. loaded with the .338 | 250gr | Sierra MatchKing. Winchester StaBALL HD delivers the highest muzzle velocity at 2,838 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,838 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 250.0 gr projectile in 0.338" calls for a 1:12.5 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. Vihtavuori N560, Accurate MAGPRO, Ramshot Grand rank at the top here: for .338 Norma Mag. with the .338 | 250gr | Sierra MatchKing 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.