Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Rhino Penetrator bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand and Accurate High Country.
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% | 56,869 psi | 89% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,781 psi | 86% | 2654 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,520 psi | 85% | 2766 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 55,390 psi | 87% | 2766 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 56,101 psi | 88% | 2615 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,434 psi | 87% | 2707 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 96% | 56,739 psi | 89% | 2766 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2615 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,337 psi | 66% | 2579 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,564 psi | 87% | 2703 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,564 psi | 87% | 2703 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,305 psi | 90% | 2635 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,550 psi | 87% | 2703 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,797 psi | 89% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,897 psi | 86% | 2697 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,608 psi | 89% | 2759 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,027 psi | 85% | 2680 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 2736 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,302 psi | 85% | 2766 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,201 psi | 87% | 2674 fps | 96.3% |
| Bofors RP15 | <<locked>> | 98% | 55,564 psi | 87% | 2746 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 2684 fps | 98.6% |
| Bofors RP5 | <<locked>> | 96% | 56,608 psi | 89% | 2759 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 57,392 psi | 90% | 2654 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2694 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 86% | 56,478 psi | 89% | 2707 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 55,593 psi | 87% | 2664 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 94% | 56,898 psi | 89% | 2707 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,622 psi | 87% | 2690 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,811 psi | 87% | 2631 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2802 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 56,826 psi | 89% | 2743 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,201 psi | 87% | 2641 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,288 psi | 87% | 2628 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 55,158 psi | 86% | 2648 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,433 psi | 85% | 2641 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 96% | 54,636 psi | 86% | 2746 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 55,854 psi | 88% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,421 psi | 90% | 2671 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 2638 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,101 psi | 88% | 2694 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2507 fps | 97.7% |
| Norma MRP | <<locked>> | 94% | 56,594 psi | 89% | 2782 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,739 psi | 89% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,216 psi | 87% | 2762 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 55,564 psi | 87% | 2694 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2756 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1686 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,289 psi | 88% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,737 psi | 86% | 2677 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,753 psi | 89% | 2756 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,779 psi | 83% | 2802 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 2684 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 55,056 psi | 86% | 2605 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,782 psi | 89% | 2680 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 54,389 psi | 85% | 2684 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 57,392 psi | 90% | 2654 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,854 psi | 88% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,421 psi | 90% | 2671 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,521 psi | 89% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,984 psi | 86% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,013 psi | 86% | 2582 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,682 psi | 90% | 2733 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 54,752 psi | 86% | 2598 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,723 psi | 86% | 2621 fps | 98.2% |
| Somchem S365 | <<locked>> | 90% | 57,072 psi | 89% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,911 psi | 86% | 2661 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 56,014 psi | 88% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,071 psi | 86% | 2631 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,418 psi | 85% | 2641 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 54,114 psi | 85% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,536 psi | 89% | 2707 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,463 psi | 88% | 2779 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2756 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,820 psi | 77% | 2694 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,360 psi | 85% | 2592 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,710 psi | 89% | 2710 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,042 psi | 86% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,737 psi | 86% | 2657 fps | 99.5% |
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% | 33,214 psi | 52% | 2270 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 44,628 psi | 70% | 2503 fps | 100% |
| Accurate High Country | 76.3 gr | 82% | 38,508 psi | 60% | 2477 fps | 95.3% |
| Accurate MAGPRO | 83.4 gr | 88% | 44,817 psi | 70% | 2589 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,634 psi | 82% | 2569 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,246 psi | 58% | 2385 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 40,596 psi | 64% | 2484 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 38,986 psi | 61% | 2448 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 30,763 psi | 48% | 2303 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,608 psi | 59% | 2388 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,608 psi | 59% | 2388 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,954 psi | 85% | 2592 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,888 psi | 67% | 2510 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,284 psi | 77% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,275 psi | 58% | 2382 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,433 psi | 56% | 2382 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,966 psi | 50% | 2300 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,833 psi | 44% | 2211 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,679 psi | 54% | 2425 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,909 psi | 81% | 2625 fps | 95.6% |
| Bofors RP15 | <<locked>> | 84% | 35,288 psi | 55% | 2379 fps | 95.3% |
| Bofors RP30 | <<locked>> | 92% | 37,608 psi | 59% | 2461 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 35,433 psi | 56% | 2382 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 47,514 psi | 74% | 2507 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 37,289 psi | 58% | 2411 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 46,325 psi | 73% | 2549 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,921 psi | 77% | 2562 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 40,582 psi | 64% | 2438 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,583 psi | 67% | 2474 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,437 psi | 63% | 2402 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,230 psi | 55% | 2451 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 45,687 psi | 72% | 2572 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,946 psi | 67% | 2444 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,907 psi | 77% | 2530 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 42,612 psi | 67% | 2454 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,409 psi | 66% | 2438 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 86% | 39,001 psi | 61% | 2464 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 46,499 psi | 73% | 2484 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 44,860 psi | 70% | 2477 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 28,732 psi | 45% | 2162 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 42,975 psi | 67% | 2480 fps | 97.5% |
| Norma 217 | <<locked>> | 96% | 33,214 psi | 52% | 2398 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 34,548 psi | 54% | 2388 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 43,961 psi | 69% | 2493 fps | 100% |
| Ramshot Grand | 79.4 gr | 86% | 38,725 psi | 61% | 2470 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 42,772 psi | 67% | 2490 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 86% | 34,360 psi | 54% | 2356 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 44% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,359 psi | 82% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,454 psi | 70% | 2523 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,772 psi | 67% | 2539 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,068 psi | 50% | 2365 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,179 psi | 69% | 2625 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 51,764 psi | 81% | 2559 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,682 psi | 61% | 2369 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 36,608 psi | 57% | 2369 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 47,514 psi | 74% | 2507 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,499 psi | 73% | 2484 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 44,860 psi | 70% | 2477 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,026 psi | 83% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,909 psi | 81% | 2444 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,484 psi | 71% | 2434 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,289 psi | 57% | 2365 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 51,547 psi | 81% | 2556 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,018 psi | 66% | 2411 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 40,741 psi | 64% | 2451 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,173 psi | 58% | 2356 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 49,356 psi | 77% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,252 psi | 71% | 2487 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 34,360 psi | 54% | 2290 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 44,701 psi | 70% | 2490 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,781 psi | 56% | 2369 fps | 99.6% |
| Vihtavuori N560 | <<locked>> | 84% | 40,074 psi | 63% | 2493 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 39,856 psi | 62% | 2480 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 45,643 psi | 72% | 2635 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,338 psi | 69% | 2454 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,499 psi | 73% | 2552 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,355 psi | 44% | 2313 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,332 psi | 57% | 2339 fps | 95.7% |
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 80 powders for .338 Norma Mag. loaded with the .338 | 250gr | Rhino Penetrator. Winchester StaBALL HD delivers the highest muzzle velocity at 2,805 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,805 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 1:13.0 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. Accurate MAGPRO, Ramshot Grand, Accurate High Country rank at the top here: for .338 Norma Mag. with the .338 | 250gr | Rhino Penetrator 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.