Load Specifications
Bullet Manufacturer:Nosler
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 | Nosler AccuBond 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 ReloadSwiss RS 52.
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% | 55,869 psi | 86% | 2365 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,812 psi | 89% | 2434 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,653 psi | 89% | 2428 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,173 psi | 86% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,130 psi | 88% | 2438 fps | 97.7% |
| Accurate 4064 | <<locked>> | 94% | 57,188 psi | 88% | 2470 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,040 psi | 82% | 2507 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 82% | 58,160 psi | 89% | 2349 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,639 psi | 90% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 58,363 psi | 90% | 2507 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,666 psi | 86% | 2457 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,421 psi | 88% | 2461 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 58,146 psi | 89% | 2428 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,985 psi | 86% | 2510 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,899 psi | 89% | 2615 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,317 psi | 85% | 2477 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,521 psi | 85% | 2365 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,260 psi | 87% | 2500 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,561 psi | 79% | 2510 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,144 psi | 86% | 2592 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,550 psi | 56% | 2283 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,292 psi | 62% | 2411 fps | 97.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,435 psi | 88% | 2356 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 58,044 psi | 89% | 2523 fps | 99.9% |
| Bofors RP3 | <<locked>> | 94% | 56,159 psi | 86% | 2497 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,188 psi | 86% | 2464 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,028 psi | 86% | 2402 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,608 psi | 87% | 2490 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,868 psi | 84% | 2533 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 58,349 psi | 90% | 2451 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,695 psi | 86% | 2434 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,377 psi | 88% | 2510 fps | 99.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 2549 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 98% | 57,159 psi | 88% | 2516 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 88% | 55,347 psi | 85% | 2470 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,688 psi | 73% | 2402 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 58,131 psi | 89% | 2543 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,290 psi | 88% | 2589 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 54% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,594 psi | 87% | 2470 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 58,798 psi | 90% | 2490 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 58,682 psi | 90% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,506 psi | 85% | 2428 fps | 98.2% |
| IMR 4198 | <<locked>> | 82% | 55,869 psi | 86% | 2326 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,881 psi | 81% | 2444 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 98% | 58,204 psi | 90% | 2493 fps | 98.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,270 psi | 77% | 2451 fps | 99.5% |
| IMR 4895 | <<locked>> | 92% | 57,667 psi | 89% | 2526 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,421 psi | 88% | 2461 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,943 psi | 89% | 2451 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,986 psi | 89% | 2480 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,885 psi | 89% | 2434 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 58,262 psi | 90% | 2480 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,276 psi | 88% | 2487 fps | 99.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 2477 fps | 98.4% |
| Norma 201 | <<locked>> | 90% | 56,913 psi | 88% | 2451 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,493 psi | 88% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,405 psi | 85% | 2487 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2487 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 52,489 psi | 81% | 2497 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 55,767 psi | 86% | 2510 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,097 psi | 79% | 2490 fps | 98.4% |
| Ramshot TAC | <<locked>> | 88% | 57,914 psi | 89% | 2487 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,363 psi | 88% | 2500 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 58,711 psi | 90% | 2467 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 55% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,971 psi | 88% | 2441 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,653 psi | 89% | 2493 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,579 psi | 87% | 2559 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,825 psi | 86% | 2589 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,460 psi | 81% | 2526 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,939 psi | 81% | 2552 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 88% | 58,030 psi | 89% | 2431 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,392 psi | 88% | 2451 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,709 psi | 86% | 2484 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,188 psi | 86% | 2464 fps | 97.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,276 psi | 88% | 2487 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,986 psi | 89% | 2480 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 58,262 psi | 90% | 2480 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 2477 fps | 98.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,623 psi | 87% | 2418 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,653 psi | 89% | 2543 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,536 psi | 87% | 2385 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,144 psi | 86% | 2464 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,579 psi | 87% | 2480 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,506 psi | 85% | 2356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,187 psi | 85% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 58,015 psi | 89% | 2448 fps | 98.5% |
| Somchem S321 | <<locked>> | 84% | 55,056 psi | 85% | 2448 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,856 psi | 89% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,724 psi | 86% | 2457 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,159 psi | 86% | 2480 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,847 psi | 72% | 2451 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 58,726 psi | 90% | 2359 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,637 psi | 86% | 2343 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,971 psi | 88% | 2415 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 58,102 psi | 89% | 2434 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,783 psi | 89% | 2461 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,013 psi | 85% | 2490 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 88% | 58,146 psi | 89% | 2461 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,231 psi | 87% | 2438 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,954 psi | 83% | 2497 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,378 psi | 61% | 2346 fps | 98.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,564 psi | 85% | 2477 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,682 psi | 89% | 2503 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 2552 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,590 psi | 50% | 2277 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,550 psi | 87% | 2490 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% | 46,514 psi | 72% | 2251 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,647 psi | 78% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,276 psi | 60% | 2192 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,963 psi | 71% | 2320 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,222 psi | 68% | 2254 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 37,159 psi | 57% | 2188 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 30,618 psi | 47% | 2119 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 54,578 psi | 84% | 2310 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 55,013 psi | 85% | 2333 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,859 psi | 66% | 2283 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,492 psi | 56% | 2156 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,875 psi | 69% | 2290 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,744 psi | 69% | 2274 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,431 psi | 81% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | 50.4 gr | 80% | 38,769 psi | 60% | 2310 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,911 psi | 55% | 2175 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,344 psi | 81% | 2326 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,595 psi | 59% | 2228 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,618 psi | 49% | 2136 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,922 psi | 48% | 2149 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,848 psi | 44% | 2100 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,259 psi | 54% | 2306 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,911 psi | 83% | 2313 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,843 psi | 64% | 2290 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 35,389 psi | 54% | 2178 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 44,048 psi | 68% | 2287 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,818 psi | 72% | 2280 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,468 psi | 67% | 2310 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,616 psi | 73% | 2431 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 51,155 psi | 79% | 2362 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,011 psi | 80% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,289 psi | 56% | 2178 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 40,625 psi | 63% | 2313 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 47,558 psi | 73% | 2379 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,207 psi | 66% | 2293 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,238 psi | 42% | 2005 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,030 psi | 60% | 2270 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 43,337 psi | 67% | 2375 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 40% | 1296 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,408 psi | 64% | 2251 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 42,714 psi | 66% | 2283 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,247 psi | 59% | 2182 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,640 psi | 63% | 2198 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,591 psi | 81% | 2290 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,048 psi | 68% | 2310 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,163 psi | 66% | 2274 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 32,039 psi | 49% | 2136 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,537 psi | 61% | 2254 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,875 psi | 69% | 2290 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,488 psi | 78% | 2359 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,626 psi | 64% | 2264 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,076 psi | 66% | 2228 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 38,145 psi | 59% | 2188 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 35,433 psi | 55% | 2139 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 40,190 psi | 62% | 2251 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,119 psi | 65% | 2244 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,163 psi | 65% | 2247 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,014 psi | 58% | 2221 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 49,922 psi | 77% | 2438 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 31,430 psi | 48% | 2126 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 37,362 psi | 57% | 2231 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 37,188 psi | 57% | 2254 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 44,672 psi | 69% | 2297 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,019 psi | 68% | 2313 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,414 psi | 74% | 2333 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 41% | 1329 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,198 psi | 77% | 2356 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,247 psi | 60% | 2211 fps | 95.4% |
| ReloadSwiss RS 52 | 48.8 gr | 80% | 40,161 psi | 62% | 2316 fps | 98.5% |
| ReloadSwiss RS 60 | 49.6 gr | 80% | 32,909 psi | 51% | 2205 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,837 psi | 51% | 2188 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,447 psi | 55% | 2241 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 45,905 psi | 71% | 2274 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,030 psi | 62% | 2201 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,402 psi | 51% | 2133 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 44,048 psi | 68% | 2287 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,433 psi | 55% | 2139 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,626 psi | 64% | 2264 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,145 psi | 59% | 2188 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 40,190 psi | 62% | 2251 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,113 psi | 82% | 2375 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,229 psi | 53% | 2172 fps | 97.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,185 psi | 82% | 2346 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,801 psi | 66% | 2270 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,205 psi | 63% | 2257 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,410 psi | 67% | 2198 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,027 psi | 55% | 2087 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,916 psi | 64% | 2224 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 48,327 psi | 74% | 2359 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,091 psi | 66% | 2205 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,627 psi | 66% | 2270 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 34,345 psi | 53% | 2139 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 24,772 psi | 38% | 1991 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 49,081 psi | 76% | 2247 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,700 psi | 67% | 2192 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,276 psi | 60% | 2185 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,001 psi | 62% | 2195 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,590 psi | 50% | 2083 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 32,808 psi | 50% | 2126 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,904 psi | 69% | 2287 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,363 psi | 59% | 2185 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,155 psi | 49% | 2129 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 30,603 psi | 47% | 2162 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,935 psi | 45% | 2021 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 44,309 psi | 68% | 2326 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,625 psi | 63% | 2313 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,834 psi | 44% | 2169 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,727 psi | 63% | 2264 fps | 99.3% |
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 | Nosler AccuBond. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,615 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,615 fps. Accurate 4350 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 50–90 %, 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 4350, Alliant Reloder-16, Alliant Reloder-23 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, ReloadSwiss RS 52 rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Nosler AccuBond 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.