Load Specifications
Bullet Manufacturer:Hornady
Bullet Weight:225 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:1:13.5
Load data in caliber .338 Weatherby RPM with .338 | 225gr | Hornady InterBond bullet and 109 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 60 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>> | 88% | 57,885 psi | 89% | 2549 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,550 psi | 87% | 2582 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,985 psi | 86% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 58,581 psi | 90% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,014 psi | 86% | 2575 fps | 96.8% |
| Accurate 4064 | <<locked>> | 94% | 55,680 psi | 86% | 2615 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,416 psi | 79% | 2638 fps | 99.2% |
| Accurate LT-30 | <<locked>> | 82% | 57,014 psi | 88% | 2497 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 57,479 psi | 88% | 2523 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,956 psi | 88% | 2648 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 57,783 psi | 89% | 2644 fps | 99.8% |
| ADI AR 2219 | <<locked>> | 82% | 58,450 psi | 90% | 2615 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,260 psi | 87% | 2605 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,492 psi | 87% | 2575 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,986 psi | 89% | 2703 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,347 psi | 87% | 2759 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 57,522 psi | 88% | 2664 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,566 psi | 89% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 58,262 psi | 90% | 2687 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,270 psi | 77% | 2644 fps | 99.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,578 psi | 55% | 2395 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,233 psi | 60% | 2526 fps | 96.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,159 psi | 86% | 2497 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,739 psi | 87% | 2667 fps | 99.7% |
| Bofors RP3 | <<locked>> | 96% | 58,102 psi | 89% | 2680 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2648 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 88% | 58,044 psi | 89% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,317 psi | 85% | 2635 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 57,334 psi | 88% | 2730 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 56,942 psi | 88% | 2598 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 58,146 psi | 89% | 2628 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,767 psi | 86% | 2644 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 2684 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 98% | 55,869 psi | 86% | 2651 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 90% | 57,479 psi | 88% | 2657 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,195 psi | 71% | 2530 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,434 psi | 87% | 2687 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,869 psi | 86% | 2723 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 54% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,274 psi | 85% | 2612 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,217 psi | 88% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,435 psi | 88% | 2631 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,754 psi | 89% | 2612 fps | 97.9% |
| IMR 4198 | <<locked>> | 84% | 57,856 psi | 89% | 2513 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,663 psi | 79% | 2579 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,000 psi | 88% | 2631 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,863 psi | 75% | 2585 fps | 98.9% |
| IMR 4895 | <<locked>> | 92% | 56,260 psi | 87% | 2671 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 56,260 psi | 87% | 2605 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 56,449 psi | 87% | 2592 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,405 psi | 87% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,855 psi | 87% | 2582 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 56,913 psi | 88% | 2625 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,898 psi | 86% | 2625 fps | 98.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2605 fps | 97.5% |
| Norma 201 | <<locked>> | 90% | 55,753 psi | 86% | 2598 fps | 100% |
| Norma 202 | <<locked>> | 90% | 56,202 psi | 86% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 94% | 57,348 psi | 88% | 2674 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 50,821 psi | 78% | 2628 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 94% | 58,175 psi | 89% | 2703 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,777 psi | 77% | 2621 fps | 97.5% |
| Ramshot TAC | <<locked>> | 88% | 56,623 psi | 87% | 2625 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,796 psi | 86% | 2638 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,130 psi | 88% | 2608 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 55% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,840 psi | 86% | 2589 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,246 psi | 87% | 2628 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,158 psi | 85% | 2703 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 58,305 psi | 90% | 2782 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,937 psi | 78% | 2657 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,503 psi | 79% | 2684 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 88% | 56,826 psi | 87% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,115 psi | 86% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 57,957 psi | 89% | 2671 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2648 fps | 97.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,898 psi | 86% | 2625 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,405 psi | 87% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,913 psi | 88% | 2625 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2605 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,317 psi | 85% | 2559 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 58,566 psi | 90% | 2625 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,202 psi | 86% | 2684 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,332 psi | 85% | 2533 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 58,537 psi | 90% | 2651 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,419 psi | 85% | 2625 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 57,537 psi | 89% | 2539 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 57,406 psi | 88% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,594 psi | 87% | 2582 fps | 97.6% |
| Somchem S321 | <<locked>> | 86% | 57,435 psi | 88% | 2638 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,753 psi | 87% | 2539 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 57,943 psi | 89% | 2641 fps | 100% |
| Somchem S355 | <<locked>> | 98% | 58,262 psi | 90% | 2667 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,513 psi | 70% | 2585 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 57,508 psi | 88% | 2507 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,580 psi | 89% | 2523 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,477 psi | 85% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,521 psi | 87% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,376 psi | 87% | 2605 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 2628 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 88% | 56,869 psi | 87% | 2608 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 58,247 psi | 90% | 2621 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,591 psi | 81% | 2635 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,261 psi | 59% | 2467 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2615 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 56,217 psi | 86% | 2648 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 2690 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,676 psi | 49% | 2369 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 92% | 58,798 psi | 90% | 2677 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% | 45,368 psi | 70% | 2385 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,414 psi | 76% | 2487 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,956 psi | 58% | 2316 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,672 psi | 69% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,240 psi | 76% | 2477 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 35,882 psi | 55% | 2306 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,113 psi | 52% | 2333 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 53,737 psi | 83% | 2457 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 54,099 psi | 83% | 2480 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,684 psi | 64% | 2408 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 80% | 35,462 psi | 55% | 2270 fps | 96.3% |
| ADI AR 2219 | <<locked>> | 80% | 54,694 psi | 84% | 2569 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,729 psi | 67% | 2418 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 43,598 psi | 67% | 2411 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,937 psi | 78% | 2602 fps | 99.9% |
| Alliant Power Pro 2000-MR | 53.6 gr | 80% | 37,666 psi | 58% | 2428 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,896 psi | 54% | 2293 fps | 97.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,184 psi | 79% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,521 psi | 58% | 2349 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,824 psi | 54% | 2343 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,095 psi | 46% | 2254 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,604 psi | 49% | 2297 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,709 psi | 56% | 2470 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,605 psi | 81% | 2454 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,582 psi | 62% | 2408 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 34,389 psi | 53% | 2297 fps | 97.8% |
| Bofors RP7 | <<locked>> | 94% | 48,573 psi | 75% | 2503 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,774 psi | 70% | 2411 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,192 psi | 65% | 2438 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,485 psi | 72% | 2566 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 50,111 psi | 77% | 2510 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,894 psi | 78% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,288 psi | 54% | 2293 fps | 95% |
| Hodgdon H414 | <<locked>> | 94% | 45,020 psi | 69% | 2533 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 94% | 49,342 psi | 76% | 2556 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,032 psi | 65% | 2418 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,863 psi | 46% | 2198 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,985 psi | 58% | 2395 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 96% | 48,399 psi | 74% | 2605 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 40% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,524 psi | 62% | 2379 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 41,379 psi | 64% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,202 psi | 57% | 2300 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,237 psi | 70% | 2421 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 51,401 psi | 79% | 2434 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 48,457 psi | 75% | 2526 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,701 psi | 69% | 2441 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 33,127 psi | 51% | 2293 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 38,421 psi | 59% | 2375 fps | 98% |
| IMR 8208 XBR | <<locked>> | 80% | 43,729 psi | 67% | 2418 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 49,313 psi | 76% | 2497 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,596 psi | 62% | 2395 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,192 psi | 65% | 2356 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,202 psi | 57% | 2310 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 38,827 psi | 60% | 2343 fps | 95.2% |
| Lovex S070 | <<locked>> | 94% | 44,338 psi | 68% | 2464 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 40,886 psi | 63% | 2369 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 41,118 psi | 63% | 2379 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,912 psi | 57% | 2339 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 34,577 psi | 53% | 2333 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 36,274 psi | 56% | 2346 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 41,263 psi | 63% | 2470 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 43,700 psi | 67% | 2425 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,989 psi | 66% | 2441 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,195 psi | 73% | 2464 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,498 psi | 41% | 1427 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,037 psi | 75% | 2493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,613 psi | 67% | 2431 fps | 95.7% |
| ReloadSwiss RS 52 | 52 gr | 80% | 39,059 psi | 60% | 2441 fps | 97.6% |
| ReloadSwiss RS 60 | 52.8 gr | 80% | 32,039 psi | 49% | 2316 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,274 psi | 56% | 2395 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,320 psi | 60% | 2457 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 44,831 psi | 69% | 2408 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,943 psi | 60% | 2323 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 32,372 psi | 50% | 2244 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 94% | 48,573 psi | 75% | 2503 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,827 psi | 60% | 2343 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,596 psi | 62% | 2395 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,202 psi | 57% | 2310 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 94% | 44,338 psi | 68% | 2464 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,808 psi | 80% | 2513 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 54,969 psi | 85% | 2582 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,388 psi | 51% | 2290 fps | 96.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,025 psi | 80% | 2493 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,785 psi | 64% | 2395 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,306 psi | 62% | 2382 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,511 psi | 65% | 2329 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,143 psi | 54% | 2208 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,569 psi | 67% | 2388 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 46,978 psi | 72% | 2490 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 41,945 psi | 65% | 2329 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,379 psi | 64% | 2395 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 33,286 psi | 51% | 2251 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 27,224 psi | 42% | 2185 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 48,022 psi | 74% | 2385 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,714 psi | 66% | 2326 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,218 psi | 59% | 2313 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,928 psi | 60% | 2320 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,633 psi | 49% | 2195 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 88% | 36,405 psi | 56% | 2336 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 43,830 psi | 67% | 2418 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 37,362 psi | 57% | 2310 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 35,650 psi | 55% | 2339 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 94% | 31,618 psi | 49% | 2316 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,066 psi | 46% | 2169 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 43,163 psi | 66% | 2457 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 45,020 psi | 69% | 2533 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,878 psi | 46% | 2313 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,610 psi | 61% | 2385 fps | 98.6% |
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 109 powders for .338 Weatherby RPM loaded with the .338 | 225gr | Hornady InterBond. Alliant Reloder-17 delivers the highest muzzle velocity at 2,782 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,782 fps. Accurate 4350 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:13.5 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 60, ReloadSwiss RS 52 rank at the top here: for .338 Weatherby RPM with the .338 | 225gr | Hornady InterBond 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.