Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 225gr | CutEdge ER Raptor bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 54,984 psi | 86% | 2648 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,346 psi | 85% | 2684 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 2769 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 55,593 psi | 87% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,869 psi | 89% | 2818 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,043 psi | 88% | 2743 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,201 psi | 85% | 2808 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 2861 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,535 psi | 87% | 2861 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,710 psi | 89% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,956 psi | 89% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,085 psi | 85% | 2822 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,317 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,276 psi | 90% | 2854 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 2854 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2782 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2717 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,477 psi | 87% | 2923 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2779 fps | 97.9% |
| Bofors RP3 | <<locked>> | 86% | 57,580 psi | 90% | 2776 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 2854 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 56,913 psi | 89% | 2769 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 54,404 psi | 85% | 2746 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,477 psi | 87% | 2818 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 88% | 55,230 psi | 87% | 2779 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 98% | 55,666 psi | 87% | 2805 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,534 psi | 85% | 2789 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,447 psi | 85% | 2746 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,709 psi | 87% | 2776 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,714 psi | 69% | 2753 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 90% | 55,753 psi | 87% | 2854 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,434 psi | 88% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,405 psi | 87% | 2723 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,491 psi | 85% | 2710 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 54,549 psi | 85% | 2753 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,376 psi | 87% | 2749 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 57,334 psi | 90% | 2808 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,839 psi | 86% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,174 psi | 90% | 2792 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2835 fps | 97.4% |
| Lovex S060 | <<locked>> | 82% | 56,884 psi | 89% | 2707 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,579 psi | 87% | 2717 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,230 psi | 87% | 2740 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 56,550 psi | 89% | 2782 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,237 psi | 71% | 2625 fps | 99% |
| Norma 201 | <<locked>> | 82% | 56,753 psi | 89% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,667 psi | 90% | 2720 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,246 psi | 88% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,376 psi | 87% | 2802 fps | 98.6% |
| Norma MRP | <<locked>> | 98% | 54,070 psi | 85% | 2881 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 55,477 psi | 87% | 2802 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,305 psi | 90% | 2799 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,461 psi | 84% | 2851 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 54,273 psi | 85% | 2805 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,398 psi | 74% | 2723 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,317 psi | 85% | 2733 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,737 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,768 psi | 89% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,405 psi | 87% | 2871 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2746 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 84% | 57,551 psi | 90% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,638 psi | 90% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,912 psi | 88% | 2782 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 98% | 56,579 psi | 89% | 2841 fps | 99% |
| Rottweil R 907 | <<locked>> | 90% | 56,913 psi | 89% | 2769 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,230 psi | 87% | 2740 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,579 psi | 87% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,550 psi | 89% | 2782 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,796 psi | 87% | 2782 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,753 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,551 psi | 90% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,317 psi | 87% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,795 psi | 86% | 2694 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,101 psi | 88% | 2835 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 57,232 psi | 90% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,580 psi | 90% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,740 psi | 90% | 2776 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 54,839 psi | 86% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,029 psi | 89% | 2812 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 54,433 psi | 85% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,810 psi | 86% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,390 psi | 87% | 2697 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,128 psi | 85% | 2746 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,750 psi | 83% | 2736 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 84% | 56,405 psi | 88% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,782 psi | 89% | 2802 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2858 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,389 psi | 85% | 2871 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,450 psi | 90% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,477 psi | 87% | 2818 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,717 psi | 73% | 2848 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,927 psi | 89% | 2762 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2808 fps | 98.9% |
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 2495 | <<locked>> | 80% | 51,416 psi | 81% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,585 psi | 70% | 2526 fps | 97.4% |
| Accurate 3100 | <<locked>> | 84% | 31,140 psi | 49% | 2336 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,776 psi | 76% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,246 psi | 58% | 2487 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 46,412 psi | 73% | 2595 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,524 psi | 65% | 2585 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 45,237 psi | 71% | 2680 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,735 psi | 81% | 2805 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,876 psi | 73% | 2615 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,096 psi | 79% | 2684 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,463 psi | 57% | 2503 fps | 98.8% |
| Alliant Reloder-17 | 71.7 gr | 80% | 41,597 psi | 65% | 2621 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,191 psi | 65% | 2579 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,783 psi | 61% | 2569 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,469 psi | 41% | 2260 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,155 psi | 50% | 2434 fps | 96% |
| Alliant Reloder-26 | 75.3 gr | 82% | 30,429 psi | 48% | 2428 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 40,886 psi | 64% | 2612 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,195 psi | 74% | 2628 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,783 psi | 61% | 2569 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,510 psi | 65% | 2507 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,558 psi | 75% | 2638 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,436 psi | 62% | 2536 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,525 psi | 67% | 2559 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 48,646 psi | 76% | 2694 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,485 psi | 74% | 2674 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,011 psi | 53% | 2398 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,228 psi | 82% | 2730 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,203 psi | 60% | 2625 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 38,348 psi | 60% | 2546 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 42% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,924 psi | 83% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,820 psi | 77% | 2625 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,184 psi | 80% | 2657 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 37,101 psi | 58% | 2438 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,975 psi | 67% | 2536 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 35,969 psi | 56% | 2448 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 51,401 psi | 81% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,268 psi | 74% | 2635 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 46,151 psi | 72% | 2713 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 53,621 psi | 84% | 2661 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,037 psi | 77% | 2621 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,292 psi | 63% | 2487 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 38,580 psi | 60% | 2470 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 32,474 psi | 51% | 2369 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 53,229 psi | 83% | 2677 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,085 psi | 85% | 2674 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,443 psi | 77% | 2671 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,119 psi | 66% | 2575 fps | 95.7% |
| Norma MRP | <<locked>> | 86% | 35,288 psi | 55% | 2520 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,260 psi | 58% | 2487 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,009 psi | 78% | 2694 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 42,960 psi | 67% | 2661 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 36,042 psi | 56% | 2470 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 37,942 psi | 59% | 2539 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,703 psi | 75% | 2628 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,237 psi | 69% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,188 psi | 58% | 2507 fps | 98.4% |
| ReloadSwiss RS 70 | 72.8 gr | 80% | 36,158 psi | 57% | 2516 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,157 psi | 55% | 2543 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 50,778 psi | 80% | 2631 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,382 psi | 70% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,122 psi | 72% | 2621 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 40,306 psi | 63% | 2562 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,510 psi | 65% | 2507 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,292 psi | 63% | 2487 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 49,037 psi | 77% | 2621 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,580 psi | 60% | 2470 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,614 psi | 71% | 2628 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,084 psi | 83% | 2703 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,128 psi | 85% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,759 psi | 72% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,508 psi | 62% | 2434 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,929 psi | 63% | 2556 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 53,780 psi | 84% | 2605 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,614 psi | 70% | 2572 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,282 psi | 74% | 2612 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 33,591 psi | 53% | 2441 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,130 psi | 60% | 2487 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 51,097 psi | 80% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,416 psi | 81% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,714 psi | 67% | 2507 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,624 psi | 61% | 2487 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 37,695 psi | 59% | 2470 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 49,574 psi | 78% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,072 psi | 60% | 2487 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 29,240 psi | 46% | 2333 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 47,427 psi | 74% | 2753 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,797 psi | 59% | 2457 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 39,610 psi | 62% | 2539 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,918 psi | 39% | 2290 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,229 psi | 83% | 2713 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,292 psi | 63% | 2530 fps | 95.4% |
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 95 powders for .338 Norma Mag. loaded with the .338 | 225gr | CutEdge ER Raptor. Alliant Reloder-26 delivers the highest muzzle velocity at 2,923 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,923 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for .338 Norma Mag. with the .338 | 225gr | CutEdge ER Raptor 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.