Load Specifications
Bullet Manufacturer:Barnes
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:1:14.5
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Barnes Banded Solid 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>> | 86% | 58,581 psi | 90% | 2415 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,739 psi | 87% | 2441 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,884 psi | 88% | 2438 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,332 psi | 85% | 2461 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,188 psi | 86% | 2451 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,335 psi | 62% | 2320 fps | 96.7% |
| Accurate 4064 | <<locked>> | 92% | 57,000 psi | 88% | 2484 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2569 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 57,377 psi | 88% | 2513 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 58,218 psi | 90% | 2513 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,507 psi | 87% | 2470 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,348 psi | 88% | 2438 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 58,682 psi | 90% | 2562 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,072 psi | 88% | 2628 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 58,363 psi | 90% | 2533 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,957 psi | 89% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,608 psi | 86% | 2513 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,331 psi | 84% | 2572 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,390 psi | 85% | 2602 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,711 psi | 60% | 2346 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,931 psi | 66% | 2487 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,305 psi | 88% | 2536 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 55,317 psi | 85% | 2503 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,550 psi | 85% | 2480 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,276 psi | 90% | 2451 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,825 psi | 86% | 2500 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 57,812 psi | 89% | 2589 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 57,087 psi | 88% | 2454 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,320 psi | 90% | 2484 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,608 psi | 87% | 2520 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 55,709 psi | 86% | 2566 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 96% | 56,492 psi | 87% | 2530 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 88% | 57,928 psi | 89% | 2523 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,604 psi | 78% | 2461 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,508 psi | 88% | 2556 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,652 psi | 87% | 2608 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 55% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,608 psi | 86% | 2480 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,189 psi | 90% | 2500 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,827 psi | 89% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,914 psi | 89% | 2484 fps | 98.8% |
| IMR 4198 | <<locked>> | 82% | 57,841 psi | 89% | 2369 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 2503 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,508 psi | 88% | 2510 fps | 98.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,447 psi | 82% | 2513 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 57,014 psi | 88% | 2536 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,507 psi | 87% | 2470 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,739 psi | 87% | 2454 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,319 psi | 88% | 2490 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,884 psi | 88% | 2448 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 57,783 psi | 89% | 2493 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,666 psi | 87% | 2500 fps | 99.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,580 psi | 89% | 2536 fps | 99% |
| Norma 201 | <<locked>> | 88% | 56,086 psi | 86% | 2464 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,623 psi | 87% | 2461 fps | 100% |
| Norma 203B | <<locked>> | 92% | 58,160 psi | 89% | 2543 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 56,275 psi | 87% | 2552 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 43,163 psi | 66% | 2451 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 55,448 psi | 85% | 2556 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 92% | 58,784 psi | 90% | 2569 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,157 psi | 83% | 2556 fps | 99.1% |
| Ramshot TAC | <<locked>> | 86% | 56,782 psi | 87% | 2493 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,217 psi | 86% | 2507 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,508 psi | 88% | 2474 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 56% | 1516 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,956 psi | 86% | 2448 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,724 psi | 87% | 2503 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,985 psi | 86% | 2572 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,187 psi | 85% | 2598 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,173 psi | 86% | 2592 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,724 psi | 86% | 2618 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 86% | 57,217 psi | 88% | 2441 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,782 psi | 87% | 2464 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 58,798 psi | 90% | 2539 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,550 psi | 85% | 2480 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,666 psi | 87% | 2500 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,319 psi | 88% | 2490 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 57,783 psi | 89% | 2493 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,580 psi | 89% | 2536 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,116 psi | 88% | 2556 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,216 psi | 85% | 2474 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,767 psi | 86% | 2490 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,682 psi | 89% | 2402 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,914 psi | 89% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,217 psi | 88% | 2464 fps | 98.7% |
| Somchem S321 | <<locked>> | 84% | 57,769 psi | 89% | 2500 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,913 psi | 88% | 2402 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 58,494 psi | 90% | 2510 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,680 psi | 86% | 2493 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,690 psi | 76% | 2510 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,485 psi | 72% | 2411 fps | 96.5% |
| Vihtavuori N130 | <<locked>> | 84% | 57,522 psi | 88% | 2365 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,870 psi | 89% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,347 psi | 87% | 2425 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,334 psi | 88% | 2444 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,942 psi | 88% | 2474 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 58,276 psi | 90% | 2552 fps | 100% |
| Vihtavuori N530 | <<locked>> | 86% | 57,145 psi | 88% | 2470 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,288 psi | 85% | 2444 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,927 psi | 88% | 2556 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,409 psi | 65% | 2415 fps | 99.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 58,523 psi | 90% | 2533 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,014 psi | 88% | 2513 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,927 psi | 86% | 2569 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,606 psi | 53% | 2356 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,637 psi | 86% | 2500 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% | 48,733 psi | 75% | 2297 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,156 psi | 82% | 2398 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,437 psi | 64% | 2238 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,399 psi | 74% | 2372 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,381 psi | 67% | 2260 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 35,172 psi | 54% | 2221 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,218 psi | 60% | 2238 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,632 psi | 47% | 2136 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,744 psi | 69% | 2333 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,159 psi | 59% | 2208 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,775 psi | 72% | 2336 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,253 psi | 73% | 2320 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 54,839 psi | 84% | 2513 fps | 100% |
| Alliant Power Pro 2000-MR | 53 gr | 80% | 40,698 psi | 63% | 2369 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,710 psi | 58% | 2228 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,505 psi | 84% | 2372 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,422 psi | 62% | 2280 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,357 psi | 48% | 2149 fps | 95.5% |
| Alliant Reloder-17 | 52.2 gr | 80% | 32,561 psi | 50% | 2208 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,977 psi | 42% | 2067 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 32,721 psi | 50% | 2267 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,859 psi | 67% | 2343 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 37,420 psi | 58% | 2234 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 43,439 psi | 67% | 2300 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,631 psi | 75% | 2326 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,672 psi | 70% | 2362 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,357 psi | 77% | 2487 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 53,650 psi | 83% | 2411 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 54,621 psi | 84% | 2441 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,145 psi | 59% | 2234 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 88% | 40,118 psi | 62% | 2323 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 88% | 43,990 psi | 68% | 2343 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,121 psi | 69% | 2343 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,890 psi | 41% | 2014 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,263 psi | 63% | 2326 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 42,540 psi | 65% | 2385 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 41% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,424 psi | 67% | 2303 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 45,092 psi | 69% | 2333 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,074 psi | 62% | 2234 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,424 psi | 65% | 2254 fps | 96% |
| IMR 4198 | <<locked>> | 80% | 54,650 psi | 84% | 2333 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 43,453 psi | 67% | 2323 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 39,943 psi | 61% | 2234 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 29,921 psi | 46% | 2103 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 41,423 psi | 64% | 2306 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 46,775 psi | 72% | 2336 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,142 psi | 82% | 2411 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,048 psi | 68% | 2320 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,860 psi | 69% | 2277 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,016 psi | 62% | 2238 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 34,969 psi | 54% | 2149 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 39,769 psi | 61% | 2260 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,034 psi | 68% | 2293 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,164 psi | 68% | 2297 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,842 psi | 61% | 2270 fps | 99.1% |
| Norma 204 | <<locked>> | 96% | 49,139 psi | 76% | 2451 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 40,408 psi | 62% | 2398 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 31,111 psi | 48% | 2136 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 39,392 psi | 61% | 2287 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 36,883 psi | 57% | 2267 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 46,601 psi | 72% | 2349 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,340 psi | 71% | 2369 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,459 psi | 78% | 2382 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 41% | 1352 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,460 psi | 81% | 2405 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,522 psi | 59% | 2218 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,685 psi | 66% | 2375 fps | 99.2% |
| ReloadSwiss RS 60 | 52.2 gr | 80% | 34,664 psi | 53% | 2264 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,474 psi | 50% | 2198 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,027 psi | 54% | 2254 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 48,080 psi | 74% | 2323 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,930 psi | 65% | 2254 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,201 psi | 54% | 2185 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 43,439 psi | 67% | 2300 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,969 psi | 54% | 2149 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,048 psi | 68% | 2320 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,016 psi | 62% | 2238 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 39,769 psi | 61% | 2260 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,158 psi | 56% | 2231 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,107 psi | 69% | 2329 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,337 psi | 67% | 2310 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,194 psi | 70% | 2244 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,637 psi | 58% | 2133 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 38,827 psi | 60% | 2188 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 50,546 psi | 78% | 2408 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,962 psi | 69% | 2247 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,643 psi | 69% | 2323 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 36,143 psi | 56% | 2192 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 26,208 psi | 40% | 2051 fps | 96.8% |
| Somchem S385 | <<locked>> | 98% | 43,468 psi | 67% | 2362 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 50,995 psi | 78% | 2290 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,542 psi | 70% | 2234 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,292 psi | 64% | 2231 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,858 psi | 64% | 2241 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,287 psi | 53% | 2133 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 82% | 32,547 psi | 50% | 2139 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 47,036 psi | 72% | 2336 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,234 psi | 62% | 2234 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,952 psi | 49% | 2139 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 28,848 psi | 44% | 2136 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,284 psi | 47% | 2070 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 46,731 psi | 72% | 2379 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,321 psi | 62% | 2326 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,948 psi | 41% | 2133 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,844 psi | 66% | 2316 fps | 99.7% |
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 | Barnes Banded Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,628 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 53–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:14.5 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. Alliant Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Barnes Banded Solid 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.