Load Specifications
Bullet Manufacturer:RWS
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:1:6.0
Load data in caliber .338 Weatherby RPM with .338 | 250gr | RWS Scorion HPBT-Match 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 Power Pro 2000-MR, Hodgdon Superformance and Alliant Reloder-17.
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% | 57,928 psi | 89% | 2428 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,985 psi | 88% | 2457 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,013 psi | 85% | 2477 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,651 psi | 86% | 2474 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,729 psi | 67% | 2398 fps | 97.9% |
| Accurate 4064 | <<locked>> | 90% | 56,956 psi | 88% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,014 psi | 88% | 2598 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 57,145 psi | 88% | 2536 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,885 psi | 89% | 2536 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,561 psi | 79% | 2533 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,869 psi | 86% | 2487 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,217 psi | 88% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,913 psi | 88% | 2651 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2526 fps | 96.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2526 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 58,131 psi | 89% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 58,813 psi | 90% | 2579 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 2644 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,550 psi | 85% | 2628 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,314 psi | 77% | 2520 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,611 psi | 64% | 2425 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,695 psi | 56% | 2336 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,615 psi | 72% | 2579 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,884 psi | 88% | 2556 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 55,550 psi | 85% | 2530 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 58,769 psi | 90% | 2552 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,537 psi | 89% | 2467 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,535 psi | 85% | 2520 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,624 psi | 89% | 2612 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,231 psi | 87% | 2543 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 55,854 psi | 86% | 2595 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 56,405 psi | 87% | 2559 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 86% | 57,725 psi | 89% | 2543 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2530 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,392 psi | 88% | 2579 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,391 psi | 87% | 2635 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 55% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,347 psi | 85% | 2500 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,856 psi | 89% | 2516 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,696 psi | 89% | 2523 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,450 psi | 88% | 2510 fps | 99.1% |
| IMR 4350 | <<locked>> | 98% | 55,448 psi | 85% | 2530 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,087 psi | 88% | 2533 fps | 99% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2585 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,753 psi | 87% | 2559 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,869 psi | 86% | 2487 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,072 psi | 88% | 2510 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,318 psi | 87% | 2467 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,479 psi | 88% | 2513 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,579 psi | 87% | 2526 fps | 99.7% |
| Lovex S070 | <<locked>> | 98% | 57,638 psi | 89% | 2562 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,361 psi | 56% | 2267 fps | 96% |
| Norma 201 | <<locked>> | 86% | 55,709 psi | 86% | 2480 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,275 psi | 87% | 2480 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,972 psi | 89% | 2566 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,231 psi | 87% | 2582 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 46,412 psi | 71% | 2536 fps | 97.5% |
| Norma URP | <<locked>> | 98% | 55,767 psi | 86% | 2582 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 55,042 psi | 85% | 2546 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 58,175 psi | 89% | 2635 fps | 99.7% |
| Ramshot TAC | <<locked>> | 84% | 56,115 psi | 86% | 2513 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,738 psi | 86% | 2523 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,695 psi | 87% | 2490 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,376 psi | 56% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,420 psi | 87% | 2530 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,927 psi | 86% | 2595 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,245 psi | 85% | 2621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,550 psi | 87% | 2618 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,738 psi | 86% | 2644 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 56,898 psi | 88% | 2461 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,347 psi | 87% | 2480 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,434 psi | 85% | 2520 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2507 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,110 psi | 76% | 2503 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 96% | 58,769 psi | 90% | 2552 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,579 psi | 87% | 2526 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,072 psi | 88% | 2510 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,479 psi | 88% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,638 psi | 89% | 2562 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,913 psi | 88% | 2575 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 58,494 psi | 90% | 2543 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,347 psi | 85% | 2510 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,261 psi | 88% | 2421 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,363 psi | 88% | 2421 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,782 psi | 87% | 2487 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,631 psi | 75% | 2500 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 57,058 psi | 88% | 2516 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,492 psi | 87% | 2418 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 58,044 psi | 89% | 2530 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,506 psi | 85% | 2516 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,983 psi | 83% | 2585 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,777 psi | 77% | 2487 fps | 97.6% |
| Vihtavuori N130 | <<locked>> | 82% | 56,942 psi | 88% | 2382 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,551 psi | 89% | 2405 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,231 psi | 87% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,000 psi | 88% | 2464 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,000 psi | 88% | 2497 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 58,305 psi | 90% | 2579 fps | 100% |
| Vihtavuori N530 | <<locked>> | 84% | 56,347 psi | 87% | 2487 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 58,523 psi | 90% | 2503 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,232 psi | 88% | 2585 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,934 psi | 71% | 2487 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 58,349 psi | 90% | 2556 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,521 psi | 87% | 2530 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,130 psi | 86% | 2598 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,246 psi | 57% | 2448 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,448 psi | 85% | 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% | 51,329 psi | 79% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,048 psi | 68% | 2293 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,416 psi | 79% | 2431 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,975 psi | 66% | 2280 fps | 95.8% |
| Accurate 3100 | <<locked>> | 94% | 35,795 psi | 55% | 2254 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,713 psi | 64% | 2297 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,850 psi | 47% | 2156 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 47,355 psi | 73% | 2398 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,205 psi | 62% | 2267 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 45,223 psi | 70% | 2428 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,458 psi | 76% | 2398 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,401 psi | 78% | 2375 fps | 100% |
| Alliant Power Pro 2000-MR | 56.3 gr | 80% | 43,178 psi | 66% | 2441 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 45,150 psi | 69% | 2431 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 45,150 psi | 69% | 2431 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,089 psi | 62% | 2290 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,033 psi | 66% | 2346 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,183 psi | 48% | 2169 fps | 96% |
| Alliant Reloder-17 | 55.5 gr | 80% | 34,693 psi | 53% | 2280 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 44,556 psi | 69% | 2425 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,108 psi | 42% | 2093 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,432 psi | 53% | 2283 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,953 psi | 51% | 2300 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,601 psi | 72% | 2408 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 40,001 psi | 62% | 2300 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 40,625 psi | 63% | 2274 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,024 psi | 78% | 2382 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,414 psi | 74% | 2425 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,882 psi | 83% | 2562 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,538 psi | 62% | 2300 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 37,724 psi | 58% | 2297 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 43,932 psi | 68% | 2369 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,834 psi | 74% | 2408 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,703 psi | 44% | 2083 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,048 psi | 68% | 2392 fps | 100% |
| Hodgdon Superformance | 63 gr | 86% | 39,566 psi | 61% | 2356 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 41% | 1342 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,774 psi | 70% | 2362 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 47,834 psi | 74% | 2392 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,250 psi | 65% | 2297 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,686 psi | 69% | 2320 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 40,886 psi | 63% | 2303 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,740 psi | 61% | 2257 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 29,950 psi | 46% | 2119 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 44,092 psi | 68% | 2372 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 49,458 psi | 76% | 2398 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,833 psi | 72% | 2379 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,152 psi | 73% | 2339 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 42,438 psi | 65% | 2303 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,751 psi | 53% | 2165 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 37,347 psi | 57% | 2238 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 34,214 psi | 53% | 2221 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,311 psi | 71% | 2352 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,731 psi | 72% | 2352 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,395 psi | 65% | 2339 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 46,021 psi | 71% | 2428 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 38,116 psi | 59% | 2379 fps | 95% |
| Norma URP | <<locked>> | 80% | 31,198 psi | 48% | 2156 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 41,959 psi | 65% | 2352 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 34,693 psi | 53% | 2241 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 49,182 psi | 76% | 2415 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,965 psi | 75% | 2431 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,243 psi | 82% | 2448 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 42% | 1378 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,872 psi | 63% | 2287 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,600 psi | 70% | 2444 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,941 psi | 57% | 2333 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,545 psi | 47% | 2169 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 32,706 psi | 50% | 2224 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,386 psi | 78% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,208 psi | 68% | 2313 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,579 psi | 58% | 2247 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 50,024 psi | 77% | 2457 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 43,163 psi | 66% | 2405 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 40,625 psi | 63% | 2274 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,751 psi | 53% | 2165 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,833 psi | 72% | 2379 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,438 psi | 65% | 2303 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 37,347 psi | 57% | 2238 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,450 psi | 59% | 2293 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,659 psi | 73% | 2395 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,745 psi | 70% | 2372 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,572 psi | 73% | 2300 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,798 psi | 61% | 2185 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,769 psi | 60% | 2211 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 42,772 psi | 66% | 2402 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 53,519 psi | 82% | 2470 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,137 psi | 73% | 2300 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,413 psi | 73% | 2388 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 38,261 psi | 59% | 2251 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 27,992 psi | 43% | 2119 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 41,002 psi | 63% | 2343 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 53,548 psi | 82% | 2343 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,993 psi | 74% | 2290 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,888 psi | 68% | 2287 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,324 psi | 68% | 2297 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,434 psi | 56% | 2195 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,532 psi | 50% | 2159 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 80% | 49,676 psi | 76% | 2398 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,583 psi | 66% | 2290 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,981 psi | 49% | 2159 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 27,412 psi | 42% | 2113 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,097 psi | 49% | 2139 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 49,647 psi | 76% | 2441 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 37,724 psi | 58% | 2297 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,469 psi | 39% | 2110 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,440 psi | 70% | 2379 fps | 100% |
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 | RWS Scorion HPBT-Match. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,651 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,651 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 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | RWS Scorion HPBT-Match 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.