Load Specifications
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Nosler Partition Gold bullet and 105 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% | 55,361 psi | 85% | 2382 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,479 psi | 88% | 2454 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,696 psi | 89% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,753 psi | 86% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,768 psi | 87% | 2464 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,843 psi | 63% | 2329 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 57,493 psi | 88% | 2493 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,276 psi | 88% | 2582 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 58,044 psi | 89% | 2526 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,492 psi | 85% | 2484 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,942 psi | 88% | 2477 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,928 psi | 89% | 2444 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,740 psi | 89% | 2641 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,332 psi | 85% | 2500 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 58,523 psi | 90% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,970 psi | 86% | 2520 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,911 psi | 84% | 2585 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,956 psi | 86% | 2615 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,102 psi | 60% | 2359 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,540 psi | 67% | 2503 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,914 psi | 89% | 2546 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 56,014 psi | 86% | 2516 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,144 psi | 86% | 2493 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,668 psi | 90% | 2457 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,246 psi | 87% | 2510 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 58,552 psi | 90% | 2602 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 57,595 psi | 89% | 2464 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,697 psi | 90% | 2490 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,971 psi | 88% | 2530 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 56,289 psi | 87% | 2579 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 96% | 57,087 psi | 88% | 2543 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 88% | 58,682 psi | 90% | 2536 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,937 psi | 78% | 2467 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,928 psi | 89% | 2566 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 57,072 psi | 88% | 2618 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 55% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,246 psi | 87% | 2490 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,697 psi | 90% | 2510 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,494 psi | 90% | 2510 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,537 psi | 90% | 2500 fps | 98.9% |
| IMR 4198 | <<locked>> | 82% | 58,407 psi | 90% | 2379 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2516 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,073 psi | 89% | 2523 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,041 psi | 83% | 2526 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 57,406 psi | 88% | 2546 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,942 psi | 88% | 2477 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,159 psi | 88% | 2464 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,754 psi | 89% | 2500 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,537 psi | 89% | 2457 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 58,204 psi | 90% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,246 psi | 88% | 2513 fps | 99.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 2546 fps | 99.1% |
| Norma 201 | <<locked>> | 88% | 56,797 psi | 87% | 2474 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,334 psi | 88% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 92% | 58,813 psi | 90% | 2552 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 56,797 psi | 87% | 2562 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 43,627 psi | 67% | 2464 fps | 96.3% |
| Norma URPᴾ | <<locked>> | 100% | 56,072 psi | 86% | 2566 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,724 psi | 86% | 2533 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,723 psi | 84% | 2569 fps | 99.2% |
| Ramshot TAC | <<locked>> | 86% | 57,101 psi | 88% | 2503 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,855 psi | 87% | 2516 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,841 psi | 89% | 2484 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,201 psi | 56% | 1522 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,391 psi | 87% | 2457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,290 psi | 88% | 2516 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,753 psi | 87% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,796 psi | 86% | 2612 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,797 psi | 87% | 2602 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,434 psi | 87% | 2631 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 86% | 57,711 psi | 89% | 2451 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,159 psi | 88% | 2470 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,898 psi | 86% | 2510 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,144 psi | 86% | 2493 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,246 psi | 88% | 2513 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,754 psi | 89% | 2500 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,204 psi | 90% | 2503 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 2546 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,450 psi | 88% | 2562 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,564 psi | 85% | 2484 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,391 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 58,407 psi | 90% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,291 psi | 90% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,812 psi | 89% | 2474 fps | 98.8% |
| Somchem S321 | <<locked>> | 84% | 58,421 psi | 90% | 2510 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,580 psi | 89% | 2411 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,172 psi | 85% | 2474 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,014 psi | 86% | 2503 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,299 psi | 77% | 2523 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,007 psi | 72% | 2421 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 84% | 58,030 psi | 89% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,624 psi | 90% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,811 psi | 87% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,754 psi | 89% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,566 psi | 89% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,042 psi | 85% | 2516 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 57,522 psi | 88% | 2477 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,637 psi | 86% | 2451 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 2572 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,004 psi | 66% | 2425 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,303 psi | 85% | 2500 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,421 psi | 88% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,579 psi | 87% | 2582 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,925 psi | 54% | 2365 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,289 psi | 87% | 2510 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% | 48,994 psi | 75% | 2303 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,606 psi | 82% | 2408 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,742 psi | 64% | 2244 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,892 psi | 75% | 2382 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,700 psi | 67% | 2270 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 35,694 psi | 55% | 2238 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 39,450 psi | 61% | 2244 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,024 psi | 48% | 2146 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,121 psi | 69% | 2343 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,580 psi | 59% | 2218 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,224 psi | 73% | 2349 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,776 psi | 74% | 2329 fps | 100% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 41,046 psi | 63% | 2382 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,145 psi | 59% | 2238 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 55,085 psi | 85% | 2382 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,857 psi | 63% | 2290 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,517 psi | 48% | 2156 fps | 95.7% |
| Alliant Reloder-17 | 52.7 gr | 80% | 32,909 psi | 51% | 2218 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,340 psi | 42% | 2080 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,098 psi | 51% | 2280 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,454 psi | 68% | 2356 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 37,826 psi | 58% | 2244 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 41,234 psi | 63% | 2264 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,081 psi | 76% | 2336 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,064 psi | 71% | 2372 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,039 psi | 79% | 2503 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 54,172 psi | 83% | 2421 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 55,100 psi | 85% | 2448 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,537 psi | 59% | 2244 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 88% | 40,625 psi | 63% | 2336 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 88% | 44,541 psi | 69% | 2356 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 45,585 psi | 70% | 2352 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,195 psi | 42% | 2024 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,669 psi | 64% | 2336 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 43,221 psi | 66% | 2405 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 41% | 1322 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,859 psi | 67% | 2313 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 45,368 psi | 70% | 2343 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,495 psi | 62% | 2247 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,801 psi | 66% | 2264 fps | 96.2% |
| IMR 4198 | <<locked>> | 80% | 54,911 psi | 84% | 2339 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 41,234 psi | 63% | 2290 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,277 psi | 62% | 2247 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 30,284 psi | 47% | 2113 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 41,872 psi | 64% | 2320 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,224 psi | 73% | 2349 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,534 psi | 82% | 2421 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,498 psi | 68% | 2329 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,295 psi | 70% | 2287 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,451 psi | 62% | 2251 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,317 psi | 54% | 2159 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 37,797 psi | 58% | 2228 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,237 psi | 68% | 2300 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,614 psi | 69% | 2306 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,248 psi | 62% | 2280 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 46,528 psi | 72% | 2411 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 40,872 psi | 63% | 2411 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 31,430 psi | 48% | 2146 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 39,769 psi | 61% | 2297 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 37,333 psi | 57% | 2280 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,166 psi | 73% | 2362 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,746 psi | 72% | 2379 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,821 psi | 78% | 2392 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1358 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,910 psi | 81% | 2415 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,073 psi | 60% | 2231 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,163 psi | 66% | 2385 fps | 99.3% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 35,012 psi | 54% | 2274 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,967 psi | 51% | 2211 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,273 psi | 54% | 2264 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 48,327 psi | 74% | 2329 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,148 psi | 65% | 2260 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,621 psi | 55% | 2195 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 41,234 psi | 63% | 2264 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,317 psi | 54% | 2159 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,498 psi | 68% | 2329 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,451 psi | 62% | 2251 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 37,797 psi | 58% | 2228 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,521 psi | 56% | 2241 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,469 psi | 70% | 2339 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,729 psi | 67% | 2323 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,658 psi | 70% | 2254 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,029 psi | 59% | 2142 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,146 psi | 60% | 2198 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,198 psi | 79% | 2421 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,165 psi | 69% | 2254 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,252 psi | 70% | 2336 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 36,332 psi | 56% | 2198 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 26,527 psi | 41% | 2064 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 41,133 psi | 63% | 2326 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 51,459 psi | 79% | 2300 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,006 psi | 71% | 2244 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,785 psi | 64% | 2241 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,308 psi | 65% | 2251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,635 psi | 53% | 2142 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 30,748 psi | 47% | 2103 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 47,427 psi | 73% | 2346 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,625 psi | 63% | 2244 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,271 psi | 50% | 2152 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 29,182 psi | 45% | 2146 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,647 psi | 47% | 2083 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 47,152 psi | 73% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 38,261 psi | 59% | 2290 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,166 psi | 42% | 2142 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,221 psi | 66% | 2326 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 124 powders for .338 Weatherby RPM loaded with the .338 | 250gr | Nosler Partition Gold. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,641 fps; across all powders the maximum-charge window runs from 1,486 fps to 2,641 fps. Accurate 3100 gives the best case fill at 100 %, and 124 of the 124 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 250.0 gr projectile in 0.338" calls for a 1:15.0 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 Gold they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.