Load Specifications
Bullet:.338 | 220gr | Atomic 29 HP
Bullet Manufacturer:Atomic 29
Bullet Weight:220 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:1:14.0
Load data in caliber .338 Weatherby RPM with .338 | 220gr | Atomic 29 HP bullet and 108 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 ReloadSwiss RS 60.
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>> | 88% | 55,550 psi | 85% | 2556 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 57,493 psi | 88% | 2628 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,463 psi | 87% | 2615 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,724 psi | 86% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 57,276 psi | 88% | 2621 fps | 96.7% |
| Accurate 4064 | <<locked>> | 96% | 56,144 psi | 86% | 2657 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,486 psi | 75% | 2628 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 84% | 58,523 psi | 90% | 2546 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,492 psi | 85% | 2530 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 58,189 psi | 90% | 2697 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 55,811 psi | 86% | 2651 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 56,043 psi | 86% | 2621 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 57,580 psi | 89% | 2654 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 57,682 psi | 89% | 2628 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,666 psi | 86% | 2707 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 58,015 psi | 89% | 2815 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 58,668 psi | 90% | 2713 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,376 psi | 85% | 2562 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,985 psi | 86% | 2690 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,993 psi | 74% | 2638 fps | 98.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2782 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,721 psi | 52% | 2379 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,841 psi | 89% | 2549 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 58,233 psi | 90% | 2717 fps | 99.7% |
| Bofors RP3 | <<locked>> | 96% | 55,463 psi | 85% | 2680 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 2648 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,144 psi | 86% | 2595 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,347 psi | 87% | 2684 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,723 psi | 84% | 2726 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 86% | 58,421 psi | 90% | 2651 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,738 psi | 86% | 2631 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,884 psi | 88% | 2690 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 2680 fps | 96.9% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 57,130 psi | 88% | 2700 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 92% | 58,726 psi | 90% | 2707 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,048 psi | 68% | 2523 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,914 psi | 89% | 2740 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 53,374 psi | 82% | 2713 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,722 psi | 53% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,652 psi | 87% | 2664 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 58,494 psi | 90% | 2690 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,085 psi | 85% | 2631 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,811 psi | 86% | 2615 fps | 97.3% |
| IMR 4198 | <<locked>> | 84% | 55,738 psi | 86% | 2520 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2680 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,267 psi | 71% | 2575 fps | 98.3% |
| IMR 4895 | <<locked>> | 94% | 57,392 psi | 88% | 2720 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 57,580 psi | 89% | 2654 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 57,725 psi | 89% | 2644 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 57,653 psi | 89% | 2674 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 58,059 psi | 89% | 2628 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 58,044 psi | 89% | 2671 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2621 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,734 psi | 78% | 2598 fps | 96.7% |
| Norma 200 | <<locked>> | 82% | 58,523 psi | 90% | 2575 fps | 100% |
| Norma 201 | <<locked>> | 92% | 56,768 psi | 87% | 2644 fps | 100% |
| Norma 202 | <<locked>> | 92% | 57,377 psi | 88% | 2648 fps | 100% |
| Norma 203B | <<locked>> | 96% | 58,523 psi | 90% | 2723 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 48,240 psi | 74% | 2621 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 94% | 55,579 psi | 86% | 2703 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,645 psi | 73% | 2615 fps | 96.8% |
| Ramshot TAC | <<locked>> | 90% | 58,131 psi | 89% | 2677 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 57,246 psi | 88% | 2690 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 58,755 psi | 90% | 2661 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,027 psi | 54% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,159 psi | 88% | 2638 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,464 psi | 88% | 2677 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,231 psi | 87% | 2753 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,709 psi | 86% | 2782 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2648 fps | 98.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,139 psi | 76% | 2671 fps | 98% |
| Rottweil R 901 | <<locked>> | 90% | 57,377 psi | 88% | 2621 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,884 psi | 88% | 2638 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 58,697 psi | 90% | 2713 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 2648 fps | 96.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2621 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 57,653 psi | 89% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 58,044 psi | 89% | 2671 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,734 psi | 78% | 2598 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,956 psi | 88% | 2612 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 58,305 psi | 90% | 2300 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,449 psi | 87% | 2635 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 57,363 psi | 88% | 2733 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,507 psi | 87% | 2582 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,159 psi | 86% | 2651 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,666 psi | 87% | 2674 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,521 psi | 85% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 58,653 psi | 90% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,273 psi | 83% | 2579 fps | 97% |
| Somchem S321 | <<locked>> | 86% | 54,984 psi | 85% | 2638 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 57,957 psi | 89% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,521 psi | 85% | 2644 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 55,550 psi | 85% | 2667 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,047 psi | 66% | 2575 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 88% | 58,697 psi | 90% | 2552 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,564 psi | 85% | 2533 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,608 psi | 87% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,812 psi | 89% | 2625 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2648 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,981 psi | 78% | 2621 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 90% | 58,262 psi | 90% | 2657 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,767 psi | 86% | 2625 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,995 psi | 77% | 2628 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,795 psi | 55% | 2448 fps | 96.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,982 psi | 80% | 2612 fps | 99.9% |
| Winchester 748 | <<locked>> | 90% | 57,696 psi | 89% | 2700 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 2680 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,246 psi | 87% | 2680 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% | 43,250 psi | 67% | 2388 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,050 psi | 72% | 2487 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,302 psi | 54% | 2306 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,235 psi | 65% | 2448 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 50,212 psi | 77% | 2520 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 33,446 psi | 51% | 2293 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 34,084 psi | 52% | 2365 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 51,808 psi | 80% | 2464 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,199 psi | 80% | 2487 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,813 psi | 61% | 2405 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 33,823 psi | 52% | 2264 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 52,359 psi | 81% | 2572 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,887 psi | 64% | 2418 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 41,191 psi | 63% | 2411 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,747 psi | 75% | 2605 fps | 99.7% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 35,926 psi | 55% | 2418 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,025 psi | 51% | 2283 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,863 psi | 75% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,607 psi | 55% | 2339 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,244 psi | 54% | 2382 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,429 psi | 47% | 2290 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,589 psi | 49% | 2326 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,894 psi | 78% | 2464 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,725 psi | 60% | 2402 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 32,097 psi | 49% | 2277 fps | 96.9% |
| Bofors RP7 | <<locked>> | 96% | 49,458 psi | 76% | 2549 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,816 psi | 67% | 2411 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,118 psi | 62% | 2431 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,150 psi | 68% | 2559 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 47,877 psi | 74% | 2510 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,602 psi | 75% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,043 psi | 59% | 2382 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 45,687 psi | 70% | 2575 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 98% | 53,476 psi | 82% | 2648 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 40,103 psi | 62% | 2418 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,052 psi | 46% | 2234 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,897 psi | 55% | 2382 fps | 98% |
| Hodgdon Superformance | <<locked>> | 98% | 49,893 psi | 77% | 2657 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 40% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,609 psi | 59% | 2372 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 39,320 psi | 60% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,447 psi | 55% | 2297 fps | 96.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,180 psi | 71% | 2464 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 49,690 psi | 76% | 2444 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,585 psi | 70% | 2484 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 35,418 psi | 54% | 2375 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 36,448 psi | 56% | 2369 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 41,887 psi | 64% | 2418 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 46,746 psi | 72% | 2493 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,159 psi | 59% | 2385 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 40,335 psi | 62% | 2352 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 35,085 psi | 54% | 2300 fps | 98% |
| Lovex S065 | <<locked>> | 92% | 41,872 psi | 64% | 2431 fps | 95.8% |
| Lovex S070 | <<locked>> | 96% | 44,889 psi | 69% | 2503 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 55,027 psi | 85% | 2533 fps | 100% |
| Norma 201 | <<locked>> | 80% | 38,827 psi | 60% | 2362 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 39,131 psi | 60% | 2375 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,998 psi | 54% | 2329 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 34,853 psi | 54% | 2369 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 34,490 psi | 53% | 2339 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 41,785 psi | 64% | 2510 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 41,698 psi | 64% | 2415 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,901 psi | 63% | 2434 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,397 psi | 70% | 2464 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 40% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,123 psi | 72% | 2497 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 44,251 psi | 68% | 2470 fps | 95.6% |
| ReloadSwiss RS 52 | 51.8 gr | 80% | 36,825 psi | 57% | 2428 fps | 96.7% |
| ReloadSwiss RS 60 | 52.6 gr | 80% | 30,211 psi | 46% | 2297 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,637 psi | 56% | 2434 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,059 psi | 62% | 2500 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 42,554 psi | 65% | 2405 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,927 psi | 57% | 2316 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 30,168 psi | 46% | 2224 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 96% | 49,458 psi | 76% | 2549 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 41,872 psi | 64% | 2431 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,159 psi | 59% | 2385 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 35,085 psi | 54% | 2300 fps | 98% |
| Shooters World SW4350 | <<locked>> | 96% | 44,889 psi | 69% | 2503 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,835 psi | 77% | 2516 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 55,463 psi | 85% | 2267 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,620 psi | 81% | 2585 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,488 psi | 48% | 2274 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,053 psi | 77% | 2500 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,537 psi | 61% | 2385 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,276 psi | 59% | 2375 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,698 psi | 63% | 2333 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,460 psi | 51% | 2208 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 47,239 psi | 73% | 2477 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 44,933 psi | 69% | 2490 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 40,030 psi | 62% | 2333 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,465 psi | 61% | 2388 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 31,357 psi | 48% | 2238 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 27,340 psi | 42% | 2218 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 46,166 psi | 71% | 2395 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,944 psi | 63% | 2329 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,143 psi | 56% | 2310 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,869 psi | 57% | 2316 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,675 psi | 46% | 2182 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 36,782 psi | 57% | 2375 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 41,713 psi | 64% | 2411 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 35,505 psi | 55% | 2303 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 35,911 psi | 55% | 2375 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 33,547 psi | 52% | 2395 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,429 psi | 47% | 2205 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 40,915 psi | 63% | 2451 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 45,934 psi | 71% | 2579 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,507 psi | 58% | 2375 fps | 98% |
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 108 powders for .338 Weatherby RPM loaded with the .338 | 220gr | Atomic 29 HP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,815 fps. Accurate 4350 gives the best case fill at 100 %, and 108 of the 108 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 220.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 60 rank at the top here: for .338 Weatherby RPM with the .338 | 220gr | Atomic 29 HP 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.