Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:250 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:1:15.5
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Nosler Partition RN bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
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>> | 84% | 55,941 psi | 86% | 2392 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,044 psi | 89% | 2464 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 58,247 psi | 90% | 2457 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,507 psi | 87% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,421 psi | 88% | 2477 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,437 psi | 64% | 2346 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 58,262 psi | 90% | 2507 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 58,044 psi | 89% | 2592 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 58,537 psi | 90% | 2536 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,883 psi | 86% | 2493 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,443 psi | 76% | 2480 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,392 psi | 88% | 2490 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 58,566 psi | 90% | 2457 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 58,450 psi | 90% | 2654 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,072 psi | 86% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,724 psi | 87% | 2536 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 2598 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,898 psi | 88% | 2631 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,225 psi | 74% | 2467 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,639 psi | 61% | 2372 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,237 psi | 68% | 2520 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 58,595 psi | 90% | 2559 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 56,797 psi | 87% | 2530 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,797 psi | 87% | 2507 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,651 psi | 86% | 2428 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,985 psi | 88% | 2520 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,376 psi | 85% | 2566 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 58,189 psi | 90% | 2474 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,609 psi | 89% | 2543 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 98% | 57,174 psi | 88% | 2595 fps | 99% |
| Hodgdon H4350 | <<locked>> | 96% | 57,696 psi | 89% | 2556 fps | 98% |
| Hodgdon H4895 | <<locked>> | 86% | 55,535 psi | 85% | 2500 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2480 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,682 psi | 90% | 2579 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 57,841 psi | 89% | 2635 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 55% | 1490 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,739 psi | 87% | 2503 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,782 psi | 86% | 2480 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,564 psi | 85% | 2477 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,317 psi | 85% | 2461 fps | 98.6% |
| IMR 4198 | <<locked>> | 82% | 58,755 psi | 90% | 2385 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,869 psi | 87% | 2530 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,697 psi | 90% | 2533 fps | 99% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,665 psi | 84% | 2539 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 58,189 psi | 90% | 2562 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,392 psi | 88% | 2490 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,914 psi | 89% | 2477 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 58,523 psi | 90% | 2513 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,986 psi | 89% | 2470 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,332 psi | 85% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,885 psi | 89% | 2526 fps | 99.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,740 psi | 90% | 2559 fps | 99.2% |
| Norma 201 | <<locked>> | 88% | 57,261 psi | 88% | 2484 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,870 psi | 89% | 2484 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,898 psi | 86% | 2523 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 2582 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 44,280 psi | 68% | 2480 fps | 96.6% |
| Norma URPᴾ | <<locked>> | 100% | 56,710 psi | 87% | 2579 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 56,405 psi | 87% | 2546 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,550 psi | 85% | 2585 fps | 99.4% |
| Ramshot TAC | <<locked>> | 86% | 57,769 psi | 89% | 2516 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,522 psi | 88% | 2530 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 58,537 psi | 90% | 2497 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 56% | 1526 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,898 psi | 88% | 2467 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,928 psi | 89% | 2530 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,232 psi | 88% | 2595 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,478 psi | 87% | 2621 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,696 psi | 89% | 2618 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,246 psi | 88% | 2648 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 86% | 58,276 psi | 90% | 2461 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,638 psi | 89% | 2480 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,666 psi | 87% | 2523 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 46,847 psi | 72% | 2451 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 96% | 56,797 psi | 87% | 2507 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,885 psi | 89% | 2526 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 58,523 psi | 90% | 2513 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,332 psi | 85% | 2470 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,740 psi | 90% | 2559 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 58,421 psi | 90% | 2579 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,289 psi | 87% | 2497 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,811 psi | 87% | 2513 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,463 psi | 85% | 2385 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,608 psi | 86% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 58,421 psi | 90% | 2487 fps | 98.9% |
| Somchem S321 | <<locked>> | 82% | 55,027 psi | 85% | 2474 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,088 psi | 89% | 2425 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,883 psi | 86% | 2487 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,739 psi | 87% | 2516 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,256 psi | 79% | 2539 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,587 psi | 73% | 2438 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 84% | 58,624 psi | 90% | 2385 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,724 psi | 86% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,667 psi | 89% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 58,204 psi | 90% | 2461 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 58,262 psi | 90% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,724 psi | 86% | 2530 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 58,044 psi | 89% | 2490 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,362 psi | 87% | 2464 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2585 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,627 psi | 67% | 2438 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,014 psi | 86% | 2513 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 58,218 psi | 90% | 2536 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,174 psi | 88% | 2595 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,491 psi | 55% | 2385 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,724 psi | 87% | 2520 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% | 49,617 psi | 76% | 2316 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,404 psi | 84% | 2421 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,279 psi | 65% | 2257 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,385 psi | 76% | 2392 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,423 psi | 64% | 2238 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 36,260 psi | 56% | 2251 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,016 psi | 62% | 2257 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,444 psi | 48% | 2159 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 45,658 psi | 70% | 2356 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,841 psi | 60% | 2228 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 46,325 psi | 71% | 2428 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,718 psi | 73% | 2359 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,457 psi | 75% | 2339 fps | 100% |
| Alliant Power Pro 2000-MR | 54.1 gr | 80% | 41,510 psi | 64% | 2395 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,609 psi | 59% | 2251 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,365 psi | 64% | 2303 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,052 psi | 46% | 2123 fps | 95.1% |
| Alliant Reloder-17 | 53.3 gr | 80% | 33,272 psi | 51% | 2231 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 45,266 psi | 70% | 2418 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,644 psi | 43% | 2093 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,547 psi | 52% | 2297 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,889 psi | 69% | 2365 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 38,334 psi | 59% | 2257 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 41,626 psi | 64% | 2274 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,356 psi | 76% | 2343 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,572 psi | 72% | 2382 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,561 psi | 79% | 2513 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 54,781 psi | 84% | 2434 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,001 psi | 60% | 2257 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 38,624 psi | 59% | 2303 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 44,918 psi | 69% | 2365 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 46,064 psi | 71% | 2365 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,586 psi | 42% | 2041 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,177 psi | 65% | 2349 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 40,741 psi | 63% | 2362 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 41% | 1325 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,338 psi | 68% | 2326 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 45,977 psi | 71% | 2356 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,785 psi | 63% | 2254 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,236 psi | 67% | 2277 fps | 96.4% |
| IMR 4198 | <<locked>> | 80% | 55,608 psi | 86% | 2352 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 41,829 psi | 64% | 2303 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,698 psi | 63% | 2257 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 30,516 psi | 47% | 2123 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 42,337 psi | 65% | 2329 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 47,718 psi | 73% | 2359 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 54,070 psi | 83% | 2431 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,020 psi | 69% | 2339 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,527 psi | 70% | 2297 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,741 psi | 63% | 2257 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,752 psi | 55% | 2172 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 38,174 psi | 59% | 2238 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 44,788 psi | 69% | 2313 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,121 psi | 69% | 2316 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,756 psi | 63% | 2293 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 47,253 psi | 73% | 2431 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 41,495 psi | 64% | 2428 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 31,850 psi | 49% | 2162 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,190 psi | 62% | 2306 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 35,375 psi | 54% | 2244 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 47,601 psi | 73% | 2372 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,166 psi | 73% | 2388 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,300 psi | 79% | 2402 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 42% | 1362 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,388 psi | 82% | 2425 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,479 psi | 61% | 2244 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,772 psi | 67% | 2398 fps | 99.4% |
| ReloadSwiss RS 60 | 53.3 gr | 80% | 35,389 psi | 54% | 2287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,227 psi | 48% | 2175 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,417 psi | 51% | 2224 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,878 psi | 75% | 2343 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,685 psi | 66% | 2274 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,114 psi | 56% | 2208 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 44,048 psi | 68% | 2405 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 41,626 psi | 64% | 2274 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,752 psi | 55% | 2172 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,020 psi | 69% | 2339 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,741 psi | 63% | 2257 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 38,174 psi | 59% | 2238 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,956 psi | 57% | 2254 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,905 psi | 71% | 2352 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,193 psi | 68% | 2333 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,209 psi | 71% | 2264 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,537 psi | 59% | 2152 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,537 psi | 61% | 2211 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,663 psi | 79% | 2431 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,672 psi | 70% | 2267 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,716 psi | 70% | 2349 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 36,796 psi | 57% | 2211 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 26,745 psi | 41% | 2070 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 41,713 psi | 64% | 2339 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 52,069 psi | 80% | 2310 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,572 psi | 72% | 2257 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,337 psi | 65% | 2251 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,815 psi | 66% | 2264 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,085 psi | 54% | 2156 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 31,169 psi | 48% | 2113 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,950 psi | 74% | 2359 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,060 psi | 63% | 2254 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,663 psi | 50% | 2162 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 29,544 psi | 45% | 2159 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,966 psi | 48% | 2096 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 47,659 psi | 73% | 2398 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 38,624 psi | 59% | 2303 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,485 psi | 42% | 2159 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,700 psi | 67% | 2336 fps | 99.8% |
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 | 250gr | Nosler Partition RN. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,490 fps to 2,654 fps. Accurate 3100 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 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Nosler Partition RN 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.