Load Specifications
Bullet Manufacturer:Rhino Bullets
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:1:15.0
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Rhino Solid Shank bullet and 107 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% | 55,579 psi | 86% | 2385 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,435 psi | 88% | 2454 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,638 psi | 89% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,709 psi | 86% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,681 psi | 87% | 2464 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,785 psi | 63% | 2329 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 57,392 psi | 88% | 2493 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,203 psi | 88% | 2579 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 58,001 psi | 89% | 2526 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 58,784 psi | 90% | 2523 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,826 psi | 87% | 2477 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 58,146 psi | 89% | 2448 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,624 psi | 89% | 2638 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 48,341 psi | 74% | 2461 fps | 95.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 48,341 psi | 74% | 2461 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,564 psi | 85% | 2503 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 58,450 psi | 90% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,927 psi | 86% | 2520 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 2582 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,173 psi | 86% | 2618 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,291 psi | 60% | 2362 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,511 psi | 67% | 2500 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,827 psi | 89% | 2546 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 55,927 psi | 86% | 2513 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,057 psi | 86% | 2493 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,624 psi | 90% | 2457 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,434 psi | 87% | 2510 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 58,479 psi | 90% | 2602 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 57,827 psi | 89% | 2467 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,624 psi | 90% | 2490 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,159 psi | 88% | 2533 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 98% | 56,449 psi | 87% | 2582 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 96% | 57,246 psi | 88% | 2546 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 88% | 58,610 psi | 90% | 2533 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,111 psi | 79% | 2470 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,131 psi | 89% | 2569 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 57,305 psi | 88% | 2621 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 55% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,217 psi | 86% | 2490 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,653 psi | 90% | 2507 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,450 psi | 90% | 2510 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,450 psi | 90% | 2497 fps | 98.9% |
| IMR 4198 | <<locked>> | 82% | 58,320 psi | 90% | 2379 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,188 psi | 86% | 2520 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,986 psi | 89% | 2520 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,983 psi | 83% | 2523 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 57,363 psi | 88% | 2546 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,826 psi | 87% | 2477 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,363 psi | 88% | 2467 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,943 psi | 89% | 2503 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,464 psi | 88% | 2457 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 58,117 psi | 89% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,159 psi | 88% | 2513 fps | 99.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 2546 fps | 99.1% |
| Norma 201 | <<locked>> | 88% | 56,739 psi | 87% | 2474 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,290 psi | 88% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 92% | 58,755 psi | 90% | 2552 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 2566 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 43,758 psi | 67% | 2464 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 56,014 psi | 86% | 2566 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,637 psi | 86% | 2533 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2569 fps | 99.2% |
| Ramshot TAC | <<locked>> | 86% | 57,305 psi | 88% | 2507 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,753 psi | 87% | 2516 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,725 psi | 89% | 2484 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 56% | 1519 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,347 psi | 87% | 2457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,203 psi | 88% | 2516 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,652 psi | 87% | 2582 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,014 psi | 86% | 2612 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,695 psi | 87% | 2602 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 2628 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 86% | 57,624 psi | 89% | 2451 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,072 psi | 88% | 2470 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,796 psi | 86% | 2507 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,057 psi | 86% | 2493 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,159 psi | 88% | 2513 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,943 psi | 89% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,117 psi | 89% | 2503 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 2546 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,667 psi | 89% | 2566 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,782 psi | 86% | 2487 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,347 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 58,320 psi | 90% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,508 psi | 90% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,711 psi | 89% | 2474 fps | 98.8% |
| Somchem S321 | <<locked>> | 84% | 58,305 psi | 90% | 2510 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,537 psi | 89% | 2411 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,085 psi | 85% | 2474 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,188 psi | 86% | 2507 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,502 psi | 78% | 2523 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,963 psi | 72% | 2421 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 84% | 57,957 psi | 89% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,508 psi | 90% | 2395 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,043 psi | 88% | 2434 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,638 psi | 89% | 2451 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,783 psi | 89% | 2487 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 58,784 psi | 90% | 2562 fps | 100% |
| Vihtavuori N530 | <<locked>> | 86% | 57,479 psi | 88% | 2477 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,854 psi | 86% | 2454 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,696 psi | 89% | 2572 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,917 psi | 66% | 2425 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,448 psi | 85% | 2500 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,609 psi | 89% | 2523 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,449 psi | 87% | 2582 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,070 psi | 54% | 2372 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,202 psi | 86% | 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% | 49,197 psi | 76% | 2306 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,795 psi | 83% | 2411 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,930 psi | 65% | 2247 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,820 psi | 75% | 2382 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,918 psi | 68% | 2274 fps | 95.6% |
| Accurate 3100 | <<locked>> | 96% | 35,650 psi | 55% | 2234 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 39,653 psi | 61% | 2247 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,966 psi | 48% | 2146 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,295 psi | 70% | 2346 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,551 psi | 59% | 2218 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,398 psi | 73% | 2349 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,747 psi | 73% | 2329 fps | 100% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 41,017 psi | 63% | 2382 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 45,542 psi | 70% | 2415 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 45,542 psi | 70% | 2415 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,101 psi | 59% | 2238 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 55,013 psi | 85% | 2379 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,031 psi | 63% | 2293 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,647 psi | 49% | 2159 fps | 95.8% |
| Alliant Reloder-17 | 52.7 gr | 80% | 32,866 psi | 51% | 2218 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,311 psi | 42% | 2080 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,069 psi | 51% | 2280 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,396 psi | 68% | 2352 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 37,826 psi | 58% | 2244 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 41,191 psi | 63% | 2264 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,023 psi | 75% | 2336 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,035 psi | 71% | 2369 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,981 psi | 78% | 2503 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 54,099 psi | 83% | 2421 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 54,998 psi | 85% | 2448 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,696 psi | 60% | 2247 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 88% | 40,596 psi | 62% | 2336 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 88% | 44,469 psi | 68% | 2356 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 45,759 psi | 70% | 2356 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,166 psi | 42% | 2024 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,611 psi | 64% | 2336 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 43,134 psi | 66% | 2402 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 41% | 1322 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,772 psi | 67% | 2313 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 45,571 psi | 70% | 2346 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,451 psi | 62% | 2247 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,946 psi | 66% | 2267 fps | 96.2% |
| IMR 4198 | <<locked>> | 80% | 55,143 psi | 85% | 2343 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 41,205 psi | 63% | 2287 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,219 psi | 62% | 2244 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 30,226 psi | 47% | 2113 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,032 psi | 65% | 2323 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,398 psi | 73% | 2349 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,490 psi | 82% | 2421 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,425 psi | 68% | 2326 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,223 psi | 70% | 2287 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,422 psi | 62% | 2251 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,317 psi | 54% | 2159 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 37,768 psi | 58% | 2228 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,411 psi | 68% | 2303 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,556 psi | 69% | 2306 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,408 psi | 62% | 2283 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 46,673 psi | 72% | 2415 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 40,988 psi | 63% | 2411 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 31,575 psi | 49% | 2152 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,740 psi | 61% | 2297 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 37,275 psi | 57% | 2277 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,137 psi | 73% | 2362 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,644 psi | 72% | 2375 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,039 psi | 79% | 2395 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1358 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,823 psi | 81% | 2411 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,044 psi | 60% | 2231 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,134 psi | 66% | 2385 fps | 99.3% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 34,983 psi | 54% | 2274 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 30,806 psi | 47% | 2159 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,418 psi | 54% | 2267 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 48,501 psi | 75% | 2333 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,322 psi | 65% | 2264 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,563 psi | 55% | 2195 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 41,191 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% | 44,425 psi | 68% | 2326 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,422 psi | 62% | 2251 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 37,768 psi | 58% | 2228 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,477 psi | 56% | 2241 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,426 psi | 70% | 2339 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,700 psi | 67% | 2320 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,614 psi | 70% | 2254 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,000 psi | 58% | 2142 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,305 psi | 60% | 2201 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 51,126 psi | 79% | 2421 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,339 psi | 70% | 2257 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,208 psi | 70% | 2336 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 36,506 psi | 56% | 2201 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 26,498 psi | 41% | 2060 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 41,307 psi | 64% | 2329 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,430 psi | 79% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,977 psi | 71% | 2244 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,756 psi | 64% | 2238 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,279 psi | 65% | 2251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,606 psi | 53% | 2142 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 30,879 psi | 48% | 2103 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,384 psi | 73% | 2346 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,785 psi | 63% | 2247 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,256 psi | 50% | 2152 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 29,124 psi | 45% | 2146 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,632 psi | 47% | 2083 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 47,094 psi | 72% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 38,203 psi | 59% | 2290 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,267 psi | 42% | 2149 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,163 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 107 powders for .338 Weatherby RPM loaded with the .338 | 250gr | Rhino Solid Shank. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,638 fps; across all powders the maximum-charge window runs from 1,486 fps to 2,638 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, 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, Alliant Power Pro Varmint 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 | Rhino Solid Shank 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.