Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:206 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Weatherby RPM load data
Case Length (l3):2.55"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.6 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:12.5
Load data in caliber .338 Weatherby RPM with .338 | 206gr | Peregrine VLR-5 bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and Hodgdon CFE223.
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 2015 | <<locked>> | 90% | 55,796 psi | 86% | 2648 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,086 psi | 86% | 2740 fps | 99.2% |
| Accurate 2230 | <<locked>> | 82% | 57,305 psi | 88% | 2756 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 57,885 psi | 89% | 2717 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,275 psi | 87% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,927 psi | 86% | 2730 fps | 100% |
| Accurate 2700 | <<locked>> | 96% | 57,943 psi | 89% | 2700 fps | 95.9% |
| Accurate 4064 | <<locked>> | 98% | 55,840 psi | 86% | 2743 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,788 psi | 69% | 2648 fps | 97.2% |
| Accurate LT-30 | <<locked>> | 84% | 56,028 psi | 86% | 2598 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,463 psi | 87% | 2625 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 58,349 psi | 90% | 2782 fps | 99.8% |
| ADI AR 2207 | <<locked>> | 82% | 57,377 psi | 88% | 2612 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 55,811 psi | 86% | 2726 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 56,565 psi | 87% | 2713 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 57,812 psi | 89% | 2743 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 57,609 psi | 89% | 2717 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,680 psi | 86% | 2792 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 58,378 psi | 90% | 2900 fps | 99.6% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,709 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,999 psi | 86% | 2772 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,933 psi | 69% | 2654 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 2805 fps | 99.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 58,334 psi | 90% | 2631 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 58,552 psi | 90% | 2641 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 58,595 psi | 90% | 2802 fps | 99.3% |
| Bofors RP3 | <<locked>> | 98% | 55,347 psi | 85% | 2762 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,594 psi | 87% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,565 psi | 87% | 2772 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,723 psi | 84% | 2812 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 88% | 58,726 psi | 90% | 2743 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 56,173 psi | 86% | 2723 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,942 psi | 88% | 2772 fps | 98.7% |
| Hodgdon H4198 | <<locked>> | 82% | 58,059 psi | 89% | 2644 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 55,390 psi | 85% | 2746 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,988 psi | 63% | 2543 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 57,696 psi | 89% | 2825 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,490 psi | 53% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,869 psi | 87% | 2749 fps | 99.8% |
| IMR 3031 | <<locked>> | 94% | 58,378 psi | 90% | 2779 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 58,813 psi | 90% | 2759 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,275 psi | 87% | 2697 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 56,318 psi | 87% | 2615 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,100 psi | 85% | 2710 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,960 psi | 66% | 2595 fps | 96.9% |
| IMR 4895 | <<locked>> | 96% | 57,377 psi | 88% | 2802 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 92% | 57,812 psi | 89% | 2743 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 57,841 psi | 89% | 2730 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 58,088 psi | 89% | 2733 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 57,522 psi | 88% | 2759 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 58,552 psi | 90% | 2717 fps | 99.8% |
| Lovex S062 | <<locked>> | 98% | 58,160 psi | 89% | 2759 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,285 psi | 77% | 2648 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 55,274 psi | 85% | 2625 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,985 psi | 88% | 2730 fps | 100% |
| Norma 202 | <<locked>> | 94% | 57,537 psi | 89% | 2736 fps | 100% |
| Norma 203B | <<locked>> | 98% | 58,566 psi | 90% | 2808 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 45,063 psi | 69% | 2644 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 55,666 psi | 86% | 2785 fps | 99.6% |
| Ramshot TAC | <<locked>> | 92% | 58,740 psi | 90% | 2762 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 92% | 57,609 psi | 89% | 2779 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,738 psi | 86% | 2700 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,722 psi | 53% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 57,740 psi | 89% | 2730 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 57,928 psi | 89% | 2759 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,869 psi | 86% | 2831 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,680 psi | 86% | 2867 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,585 psi | 69% | 2664 fps | 96.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,006 psi | 71% | 2680 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 92% | 57,595 psi | 89% | 2710 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 57,101 psi | 88% | 2723 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,911 psi | 84% | 2749 fps | 99.8% |
| Shooters World AR Plus | <<locked>> | 82% | 57,841 psi | 89% | 2730 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,285 psi | 77% | 2648 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 94% | 57,522 psi | 88% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 58,160 psi | 89% | 2759 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 57,653 psi | 89% | 2703 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,217 psi | 86% | 2359 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,913 psi | 88% | 2726 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 57,232 psi | 88% | 2815 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,826 psi | 87% | 2674 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,623 psi | 87% | 2736 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,753 psi | 87% | 2756 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,985 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,390 psi | 85% | 2628 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,637 psi | 86% | 2730 fps | 100% |
| Somchem S335 | <<locked>> | 94% | 58,262 psi | 90% | 2677 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,854 psi | 86% | 2726 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 2749 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,856 psi | 61% | 2589 fps | 99% |
| Vihtavuori N120 | <<locked>> | 82% | 57,203 psi | 88% | 2559 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 55,666 psi | 86% | 2605 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,927 psi | 86% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,246 psi | 87% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 57,972 psi | 89% | 2713 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,824 psi | 83% | 2687 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,645 psi | 73% | 2648 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 92% | 58,566 psi | 90% | 2743 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 56,130 psi | 86% | 2713 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,427 psi | 71% | 2648 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,805 psi | 75% | 2638 fps | 99.3% |
| Winchester 748 | <<locked>> | 92% | 57,914 psi | 89% | 2792 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,536 psi | 87% | 2766 fps | 99.9% |
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 2015 | <<locked>> | 80% | 40,596 psi | 62% | 2425 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,663 psi | 81% | 2690 fps | 98.8% |
| Accurate 2230 | <<locked>> | 80% | 53,171 psi | 82% | 2697 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 44,164 psi | 68% | 2523 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 32,677 psi | 50% | 2333 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,392 psi | 61% | 2474 fps | 99.5% |
| Accurate 2700 | <<locked>> | 94% | 54,201 psi | 83% | 2648 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 30,951 psi | 48% | 2313 fps | 98.6% |
| Accurate 4350 | <<locked>> | 96% | 38,740 psi | 60% | 2536 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 49,559 psi | 76% | 2513 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,951 psi | 77% | 2533 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,376 psi | 58% | 2428 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 80% | 54,128 psi | 83% | 2572 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 36,274 psi | 56% | 2388 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 49,284 psi | 76% | 2615 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,465 psi | 61% | 2448 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 38,435 psi | 59% | 2451 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,672 psi | 70% | 2635 fps | 99% |
| Alliant Power Pro 2000-MR | 55.7 gr | 84% | 38,580 psi | 59% | 2546 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,719 psi | 47% | 2300 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,282 psi | 71% | 2523 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,636 psi | 55% | 2411 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 96% | 39,784 psi | 61% | 2549 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,780 psi | 54% | 2467 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 80% | 54,853 psi | 84% | 2589 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,327 psi | 74% | 2507 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,812 psi | 60% | 2477 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 29,776 psi | 46% | 2290 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,684 psi | 64% | 2448 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,507 psi | 58% | 2457 fps | 98.4% |
| Hodgdon CFE223 | 54.3 gr | 80% | 41,249 psi | 63% | 2582 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 45,252 psi | 70% | 2552 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,730 psi | 70% | 2569 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,814 psi | 63% | 2510 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 54,592 psi | 84% | 2602 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 37,637 psi | 58% | 2441 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,924 psi | 52% | 2392 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,576 psi | 52% | 2402 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,541 psi | 39% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,274 psi | 56% | 2395 fps | 96.7% |
| IMR 3031 | <<locked>> | 80% | 36,521 psi | 56% | 2448 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,665 psi | 55% | 2369 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,647 psi | 76% | 2595 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 47,253 psi | 73% | 2497 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 51,866 psi | 80% | 2661 fps | 95.6% |
| IMR 4831 | <<locked>> | 96% | 37,550 psi | 58% | 2490 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 34,040 psi | 52% | 2388 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 39,465 psi | 61% | 2448 fps | 98.3% |
| Lovex D073.4 | <<locked>> | 80% | 53,954 psi | 83% | 2677 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 43,859 psi | 67% | 2526 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 35,491 psi | 55% | 2408 fps | 98.8% |
| Lovex S060 | <<locked>> | 80% | 38,392 psi | 59% | 2385 fps | 96.8% |
| Lovex S062 | <<locked>> | 80% | 32,996 psi | 51% | 2326 fps | 96.6% |
| Lovex S065 | <<locked>> | 96% | 44,454 psi | 68% | 2549 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 51,967 psi | 80% | 2582 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,477 psi | 56% | 2388 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 36,651 psi | 56% | 2405 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 34,983 psi | 54% | 2402 fps | 95.8% |
| Norma URP | <<locked>> | 96% | 39,479 psi | 61% | 2539 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 82% | 34,505 psi | 53% | 2408 fps | 95.3% |
| Ramshot TAC | <<locked>> | 82% | 41,989 psi | 65% | 2490 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,377 psi | 59% | 2457 fps | 96.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,902 psi | 66% | 2493 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,643 psi | 39% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,440 psi | 68% | 2533 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,529 psi | 73% | 2602 fps | 95.4% |
| ReloadSwiss RS 52 | 52.7 gr | 82% | 36,753 psi | 57% | 2497 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,369 psi | 44% | 2303 fps | 95.5% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,856 psi | 60% | 2552 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,004 psi | 66% | 2625 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 40,059 psi | 62% | 2441 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 34,664 psi | 53% | 2343 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 32,082 psi | 49% | 2343 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 53,954 psi | 83% | 2677 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 96% | 44,454 psi | 68% | 2549 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,491 psi | 55% | 2408 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 32,996 psi | 51% | 2326 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,094 psi | 72% | 2549 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,432 psi | 82% | 2326 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,647 psi | 76% | 2625 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,678 psi | 52% | 2395 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,152 psi | 73% | 2543 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,914 psi | 61% | 2464 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,926 psi | 55% | 2395 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,377 psi | 59% | 2362 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,401 psi | 48% | 2234 fps | 99.1% |
| Somchem S321 | <<locked>> | 80% | 42,235 psi | 65% | 2520 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 37,710 psi | 58% | 2365 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 36,970 psi | 57% | 2411 fps | 96.3% |
| Somchem S355 | <<locked>> | 84% | 33,417 psi | 51% | 2356 fps | 95.8% |
| Somchem S365 | <<locked>> | 90% | 28,877 psi | 44% | 2323 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 54,056 psi | 83% | 2523 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,642 psi | 67% | 2438 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,537 psi | 59% | 2365 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,649 psi | 52% | 2343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,693 psi | 53% | 2346 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 27,775 psi | 43% | 2201 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 94% | 38,986 psi | 60% | 2490 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 39,204 psi | 60% | 2441 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 33,228 psi | 51% | 2329 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 96% | 40,741 psi | 63% | 2543 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,735 psi | 50% | 2323 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 38,174 psi | 59% | 2477 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,056 psi | 54% | 2398 fps | 96.5% |
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 104 powders for .338 Weatherby RPM loaded with the .338 | 206gr | Peregrine VLR-5. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,900 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,900 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 206.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- TS 15.5, Alliant Reloder-16 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .338 Weatherby RPM with the .338 | 206gr | Peregrine VLR-5 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.