Load Specifications
Bullet Manufacturer:Impala Bullets
Bullet Weight:210 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:1:15.0
Load data in caliber .338 Weatherby RPM with .338 | 210gr | Impala RNFP KO bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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>> | 86% | 56,855 psi | 87% | 2618 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,492 psi | 85% | 2648 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,985 psi | 86% | 2648 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,855 psi | 87% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,551 psi | 89% | 2671 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 55,651 psi | 86% | 2690 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,693 psi | 83% | 2749 fps | 99% |
| Accurate LT-30 | <<locked>> | 82% | 58,189 psi | 90% | 2595 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,610 psi | 90% | 2621 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 58,769 psi | 90% | 2756 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,985 psi | 86% | 2700 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,711 psi | 89% | 2710 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 58,291 psi | 90% | 2684 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,202 psi | 86% | 2762 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,783 psi | 89% | 2864 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,043 psi | 86% | 2726 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,260 psi | 87% | 2618 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,710 psi | 87% | 2749 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2743 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,014 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,681 psi | 58% | 2503 fps | 97.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,334 psi | 88% | 2595 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 58,276 psi | 90% | 2769 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 56,855 psi | 87% | 2746 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,000 psi | 88% | 2707 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,101 psi | 86% | 2644 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,116 psi | 88% | 2743 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 58,755 psi | 90% | 2831 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 58,334 psi | 90% | 2700 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,869 psi | 86% | 2680 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,812 psi | 89% | 2753 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,275 psi | 87% | 2789 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 98% | 57,232 psi | 88% | 2749 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 88% | 55,869 psi | 86% | 2720 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,066 psi | 74% | 2635 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 58,073 psi | 89% | 2795 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,479 psi | 88% | 2822 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,549 psi | 55% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,840 psi | 87% | 2717 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,593 psi | 86% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,521 psi | 85% | 2684 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,767 psi | 86% | 2664 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 55,651 psi | 86% | 2572 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,127 psi | 82% | 2674 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 98% | 58,436 psi | 90% | 2733 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,879 psi | 78% | 2690 fps | 98.7% |
| IMR 4895 | <<locked>> | 92% | 58,102 psi | 89% | 2779 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 57,711 psi | 89% | 2710 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 58,653 psi | 90% | 2700 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 58,653 psi | 90% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 58,233 psi | 90% | 2684 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 55,564 psi | 85% | 2687 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,841 psi | 89% | 2726 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 2713 fps | 97.2% |
| Norma 201 | <<locked>> | 90% | 57,914 psi | 89% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,928 psi | 89% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,956 psi | 86% | 2736 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,576 psi | 81% | 2733 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 92% | 55,825 psi | 86% | 2756 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,517 psi | 79% | 2723 fps | 97.2% |
| Ramshot TAC | <<locked>> | 88% | 58,073 psi | 89% | 2726 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,537 psi | 89% | 2746 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 58,784 psi | 90% | 2710 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,245 psi | 56% | 1667 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,464 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,986 psi | 89% | 2733 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,782 psi | 87% | 2812 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,014 psi | 86% | 2841 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,866 psi | 81% | 2766 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,011 psi | 82% | 2782 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 86% | 56,231 psi | 87% | 2648 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 58,262 psi | 90% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,608 psi | 87% | 2736 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,000 psi | 88% | 2707 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,841 psi | 89% | 2726 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 58,653 psi | 90% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,564 psi | 85% | 2687 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 2713 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,159 psi | 88% | 2664 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,740 psi | 89% | 2789 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,652 psi | 87% | 2635 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,768 psi | 87% | 2707 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,029 psi | 88% | 2730 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,985 psi | 86% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,666 psi | 86% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2684 fps | 97.4% |
| Somchem S321 | <<locked>> | 84% | 55,666 psi | 86% | 2697 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 58,595 psi | 90% | 2644 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,898 psi | 86% | 2697 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 56,840 psi | 87% | 2733 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,369 psi | 73% | 2690 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,927 psi | 86% | 2569 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,898 psi | 86% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,392 psi | 88% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 58,262 psi | 90% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,957 psi | 89% | 2707 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,114 psi | 85% | 2730 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 58,407 psi | 90% | 2710 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,666 psi | 87% | 2684 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,288 psi | 84% | 2736 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,625 psi | 63% | 2579 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,695 psi | 86% | 2713 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,841 psi | 89% | 2756 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 2792 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,939 psi | 52% | 2484 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,695 psi | 87% | 2736 fps | 100% |
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% | 47,863 psi | 74% | 2493 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,025 psi | 80% | 2598 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,568 psi | 64% | 2438 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,920 psi | 72% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,836 psi | 78% | 2572 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,175 psi | 60% | 2428 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 36,622 psi | 56% | 2448 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 54,781 psi | 84% | 2552 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 55,172 psi | 85% | 2575 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 43,671 psi | 67% | 2513 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 37,304 psi | 57% | 2372 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,484 psi | 70% | 2523 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 45,397 psi | 70% | 2516 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,808 psi | 81% | 2713 fps | 99.8% |
| Alliant Power Pro 2000-MR | 55 gr | 80% | 39,479 psi | 61% | 2533 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,101 psi | 57% | 2402 fps | 97.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,156 psi | 82% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,624 psi | 61% | 2454 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,709 psi | 56% | 2448 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,039 psi | 49% | 2359 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,707 psi | 52% | 2408 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,940 psi | 83% | 2552 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,380 psi | 65% | 2510 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 36,985 psi | 57% | 2411 fps | 97.9% |
| Bofors RP7 | <<locked>> | 94% | 50,517 psi | 78% | 2605 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,268 psi | 73% | 2510 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,338 psi | 68% | 2546 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,124 psi | 74% | 2671 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 51,677 psi | 80% | 2612 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,605 psi | 81% | 2638 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 40,030 psi | 62% | 2454 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 94% | 46,688 psi | 72% | 2635 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 96% | 53,882 psi | 83% | 2700 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 44,034 psi | 68% | 2526 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,068 psi | 49% | 2310 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,726 psi | 61% | 2493 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 50,256 psi | 77% | 2710 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 41% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,032 psi | 65% | 2477 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 43,511 psi | 67% | 2526 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,160 psi | 60% | 2405 fps | 97% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,731 psi | 72% | 2516 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,750 psi | 81% | 2536 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,053 psi | 77% | 2625 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,226 psi | 76% | 2589 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 35,375 psi | 54% | 2402 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 40,480 psi | 62% | 2484 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 45,484 psi | 70% | 2523 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 51,851 psi | 80% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,946 psi | 66% | 2503 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,729 psi | 67% | 2451 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 39,378 psi | 61% | 2418 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 41,031 psi | 63% | 2448 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 46,485 psi | 72% | 2569 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,395 psi | 67% | 2480 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 43,236 psi | 67% | 2487 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,030 psi | 60% | 2444 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 36,782 psi | 57% | 2441 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,247 psi | 59% | 2454 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 42,975 psi | 66% | 2572 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 45,469 psi | 70% | 2523 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,817 psi | 69% | 2546 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,979 psi | 75% | 2566 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 42% | 1486 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,691 psi | 78% | 2598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,368 psi | 70% | 2533 fps | 95.4% |
| ReloadSwiss RS 52 | 53.3 gr | 80% | 40,944 psi | 63% | 2546 fps | 97.4% |
| ReloadSwiss RS 60 | 54.1 gr | 80% | 33,910 psi | 52% | 2421 fps | 98.5% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,392 psi | 59% | 2503 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,191 psi | 63% | 2559 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,529 psi | 73% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,481 psi | 64% | 2434 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 34,954 psi | 54% | 2359 fps | 97% |
| Rottweil R 907 | <<locked>> | 94% | 50,517 psi | 78% | 2605 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,031 psi | 63% | 2448 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,946 psi | 66% | 2503 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 39,378 psi | 61% | 2418 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 94% | 46,485 psi | 72% | 2569 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,534 psi | 82% | 2615 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,302 psi | 54% | 2392 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,447 psi | 82% | 2592 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,019 psi | 68% | 2503 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,032 psi | 65% | 2484 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,338 psi | 68% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,970 psi | 57% | 2310 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,602 psi | 75% | 2539 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 48,965 psi | 75% | 2595 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 44,135 psi | 68% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,178 psi | 66% | 2493 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 35,650 psi | 55% | 2359 fps | 97% |
| Somchem S365 | <<locked>> | 82% | 27,891 psi | 43% | 2251 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 49,792 psi | 77% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,367 psi | 68% | 2425 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,437 psi | 62% | 2418 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,930 psi | 63% | 2425 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,866 psi | 52% | 2303 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 88% | 38,319 psi | 59% | 2441 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 45,658 psi | 70% | 2520 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,392 psi | 61% | 2415 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 37,710 psi | 58% | 2444 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 34,084 psi | 52% | 2434 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,966 psi | 49% | 2270 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 44,831 psi | 69% | 2559 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 46,833 psi | 72% | 2638 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,111 psi | 49% | 2428 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,408 psi | 64% | 2487 fps | 98.5% |
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 106 powders for .338 Weatherby RPM loaded with the .338 | 210gr | Impala RNFP KO. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,864 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .338 Weatherby RPM with the .338 | 210gr | Impala RNFP KO 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.