Load Specifications
Bullet:.338 | 250gr | Hornady BTHP
Bullet Manufacturer:Hornady
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:1:12.5
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Hornady BTHP bullet and 108 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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>> | 86% | 56,724 psi | 87% | 2382 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,027 psi | 85% | 2408 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 58,740 psi | 90% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,159 psi | 88% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 58,204 psi | 90% | 2461 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 38,537 psi | 59% | 2277 fps | 95.9% |
| Accurate 4064 | <<locked>> | 94% | 58,247 psi | 90% | 2487 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 2526 fps | 99.8% |
| Accurate LT-30 | <<locked>> | 82% | 58,668 psi | 90% | 2362 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 55,782 psi | 86% | 2480 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,521 psi | 87% | 2477 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 58,392 psi | 90% | 2477 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,593 psi | 86% | 2408 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,579 psi | 87% | 2523 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,129 psi | 85% | 2589 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,275 psi | 87% | 2493 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,492 psi | 87% | 2382 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,217 psi | 88% | 2520 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 2530 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,884 psi | 88% | 2608 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,318 psi | 57% | 2306 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,263 psi | 63% | 2441 fps | 98% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 58,030 psi | 89% | 2369 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,419 psi | 85% | 2497 fps | 99.9% |
| Bofors RP3 | <<locked>> | 94% | 57,101 psi | 88% | 2513 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,276 psi | 88% | 2487 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,710 psi | 87% | 2418 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,551 psi | 89% | 2507 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,883 psi | 86% | 2552 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,463 psi | 85% | 2421 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,405 psi | 87% | 2451 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 58,218 psi | 90% | 2526 fps | 99.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,174 psi | 88% | 2572 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 98% | 58,262 psi | 90% | 2536 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 88% | 56,376 psi | 87% | 2487 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2421 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,434 psi | 85% | 2520 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 58,494 psi | 90% | 2615 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 54% | 1463 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,522 psi | 88% | 2487 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,217 psi | 86% | 2467 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,028 psi | 86% | 2461 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,347 psi | 87% | 2448 fps | 98.4% |
| IMR 4198 | <<locked>> | 82% | 56,521 psi | 87% | 2343 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,621 psi | 82% | 2464 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,782 psi | 86% | 2470 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,329 psi | 79% | 2474 fps | 99.7% |
| IMR 4895 | <<locked>> | 92% | 58,668 psi | 90% | 2546 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 58,392 psi | 90% | 2477 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 58,653 psi | 90% | 2464 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,390 psi | 85% | 2457 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 58,784 psi | 90% | 2454 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,956 psi | 86% | 2461 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2507 fps | 99.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,579 psi | 86% | 2493 fps | 98.6% |
| Norma 201 | <<locked>> | 90% | 57,928 psi | 89% | 2470 fps | 100% |
| Norma 202 | <<locked>> | 90% | 58,465 psi | 90% | 2470 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,376 psi | 87% | 2507 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,215 psi | 83% | 2507 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2513 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 92% | 56,913 psi | 88% | 2533 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,069 psi | 80% | 2513 fps | 98.7% |
| Ramshot TAC | <<locked>> | 88% | 58,711 psi | 90% | 2503 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 58,247 psi | 90% | 2516 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,579 psi | 86% | 2438 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,810 psi | 55% | 1496 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,725 psi | 89% | 2457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 58,436 psi | 90% | 2510 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,638 psi | 89% | 2579 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,942 psi | 88% | 2608 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 2546 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2572 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 86% | 55,666 psi | 86% | 2411 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 58,392 psi | 90% | 2467 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,652 psi | 87% | 2500 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,276 psi | 88% | 2487 fps | 98.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2507 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,390 psi | 85% | 2457 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,956 psi | 86% | 2461 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,579 psi | 86% | 2493 fps | 98.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,609 psi | 89% | 2438 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 58,479 psi | 90% | 2559 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,450 psi | 88% | 2402 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,014 psi | 88% | 2484 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,479 psi | 88% | 2500 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,246 psi | 87% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,144 psi | 86% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,332 psi | 85% | 2425 fps | 98.2% |
| Somchem S321 | <<locked>> | 84% | 55,956 psi | 86% | 2467 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,390 psi | 85% | 2372 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,579 psi | 87% | 2474 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 57,072 psi | 88% | 2500 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,645 psi | 73% | 2470 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,970 psi | 86% | 2336 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,391 psi | 87% | 2356 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 58,102 psi | 89% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,492 psi | 85% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 58,610 psi | 90% | 2477 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2513 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,245 psi | 85% | 2434 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,087 psi | 88% | 2454 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2520 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,379 psi | 62% | 2369 fps | 98.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,420 psi | 87% | 2493 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 58,668 psi | 90% | 2520 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2575 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,228 psi | 51% | 2303 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,435 psi | 88% | 2507 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% | 47,355 psi | 73% | 2267 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,401 psi | 79% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,856 psi | 61% | 2205 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,731 psi | 72% | 2336 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,759 psi | 69% | 2270 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 35,969 psi | 55% | 2228 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 37,710 psi | 58% | 2201 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,241 psi | 48% | 2142 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 55,434 psi | 85% | 2326 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 43,352 psi | 67% | 2300 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 36,912 psi | 57% | 2172 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,368 psi | 70% | 2303 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 45,687 psi | 70% | 2290 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,069 psi | 82% | 2477 fps | 100% |
| Alliant Power Pro 2000-MR | 51.2 gr | 80% | 39,334 psi | 61% | 2329 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,579 psi | 56% | 2195 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,982 psi | 82% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,073 psi | 60% | 2244 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,111 psi | 49% | 2156 fps | 95.6% |
| Alliant Reloder-17 | 50.4 gr | 80% | 31,430 psi | 48% | 2169 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,688 psi | 43% | 2077 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 33,576 psi | 52% | 2274 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,505 psi | 84% | 2329 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,438 psi | 65% | 2306 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 36,071 psi | 55% | 2198 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 42,119 psi | 65% | 2260 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,253 psi | 73% | 2293 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,150 psi | 68% | 2326 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,646 psi | 75% | 2451 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 52,011 psi | 80% | 2382 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,707 psi | 81% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,898 psi | 57% | 2198 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 90% | 41,394 psi | 64% | 2333 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 90% | 45,179 psi | 70% | 2349 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,700 psi | 67% | 2306 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,586 psi | 42% | 2021 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,711 psi | 61% | 2287 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 92% | 44,135 psi | 68% | 2398 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 41% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,076 psi | 65% | 2267 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 43,323 psi | 67% | 2300 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,754 psi | 60% | 2198 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,263 psi | 63% | 2218 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 53,287 psi | 82% | 2303 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 42,061 psi | 65% | 2283 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,118 psi | 63% | 2244 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 30,545 psi | 47% | 2106 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,030 psi | 62% | 2270 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 45,368 psi | 70% | 2303 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 51,213 psi | 79% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,395 psi | 65% | 2283 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,555 psi | 67% | 2244 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 38,609 psi | 59% | 2201 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 36,027 psi | 55% | 2159 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 40,944 psi | 63% | 2270 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,583 psi | 66% | 2257 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,917 psi | 66% | 2267 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,493 psi | 59% | 2234 fps | 98.7% |
| Norma 204 | <<locked>> | 98% | 50,821 psi | 78% | 2461 fps | 95.7% |
| Norma URP | <<locked>> | 84% | 31,981 psi | 49% | 2146 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 38,000 psi | 58% | 2251 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 37,855 psi | 58% | 2274 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,281 psi | 70% | 2313 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,643 psi | 69% | 2329 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,052 psi | 75% | 2349 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,716 psi | 41% | 1339 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,981 psi | 78% | 2372 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,798 psi | 61% | 2231 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,944 psi | 63% | 2333 fps | 98.8% |
| ReloadSwiss RS 60 | 50.4 gr | 80% | 33,431 psi | 51% | 2224 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,344 psi | 51% | 2205 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,042 psi | 55% | 2260 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,499 psi | 72% | 2287 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,509 psi | 62% | 2218 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 33,881 psi | 52% | 2146 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 42,119 psi | 65% | 2260 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,027 psi | 55% | 2159 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,395 psi | 65% | 2283 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,609 psi | 59% | 2201 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 90% | 40,944 psi | 63% | 2270 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,853 psi | 83% | 2392 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,780 psi | 54% | 2192 fps | 97.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,853 psi | 83% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,439 psi | 67% | 2290 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,872 psi | 64% | 2274 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,932 psi | 68% | 2211 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,477 psi | 56% | 2103 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,001 psi | 62% | 2198 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,994 psi | 75% | 2375 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,598 psi | 67% | 2218 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,250 psi | 67% | 2290 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 34,824 psi | 54% | 2152 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 25,266 psi | 39% | 2011 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 49,617 psi | 76% | 2260 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,251 psi | 68% | 2205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,900 psi | 61% | 2198 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,509 psi | 62% | 2208 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,025 psi | 51% | 2100 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 31,299 psi | 48% | 2100 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,600 psi | 70% | 2303 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,015 psi | 60% | 2205 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,706 psi | 50% | 2149 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 29,356 psi | 45% | 2139 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,341 psi | 45% | 2037 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 45,034 psi | 69% | 2343 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,394 psi | 64% | 2333 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,572 psi | 42% | 2136 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,365 psi | 64% | 2280 fps | 99.5% |
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 108 powders for .338 Weatherby RPM loaded with the .338 | 250gr | Hornady BTHP. Hodgdon Superformance delivers the highest muzzle velocity at 2,615 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,615 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, Alliant Reloder-17 rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Hornady BTHP 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.