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:1:12.0
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Nosler Custom Competition 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% | 55,637 psi | 86% | 2362 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,624 psi | 89% | 2431 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,406 psi | 88% | 2425 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,985 psi | 86% | 2448 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,014 psi | 88% | 2434 fps | 97.7% |
| Accurate 4064 | <<locked>> | 94% | 57,014 psi | 88% | 2464 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,924 psi | 81% | 2500 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 82% | 57,957 psi | 89% | 2346 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,407 psi | 90% | 2372 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 58,175 psi | 89% | 2500 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,521 psi | 85% | 2454 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,232 psi | 88% | 2454 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 57,899 psi | 89% | 2425 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,796 psi | 86% | 2507 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,740 psi | 89% | 2612 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 58,784 psi | 90% | 2516 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,317 psi | 85% | 2362 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,086 psi | 86% | 2497 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,140 psi | 79% | 2500 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,695 psi | 86% | 2585 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,434 psi | 56% | 2280 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,205 psi | 62% | 2411 fps | 97.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,985 psi | 88% | 2349 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,928 psi | 89% | 2520 fps | 99.9% |
| Bofors RP3 | <<locked>> | 94% | 55,651 psi | 86% | 2487 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,072 psi | 86% | 2461 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,840 psi | 86% | 2398 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,463 psi | 87% | 2487 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 58,668 psi | 90% | 2579 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 58,117 psi | 89% | 2444 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,506 psi | 85% | 2431 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,913 psi | 88% | 2503 fps | 99.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,970 psi | 86% | 2546 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 98% | 57,014 psi | 88% | 2510 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 90% | 58,726 psi | 90% | 2510 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,572 psi | 73% | 2398 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,899 psi | 89% | 2539 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,203 psi | 88% | 2585 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 54% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,420 psi | 87% | 2467 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 58,566 psi | 90% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 58,523 psi | 90% | 2484 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,361 psi | 85% | 2425 fps | 98.2% |
| IMR 4198 | <<locked>> | 84% | 58,697 psi | 90% | 2356 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,750 psi | 81% | 2441 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 98% | 58,088 psi | 89% | 2490 fps | 98.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 2448 fps | 99.5% |
| IMR 4895 | <<locked>> | 92% | 57,508 psi | 88% | 2523 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,232 psi | 88% | 2454 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,754 psi | 89% | 2444 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,812 psi | 89% | 2477 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,696 psi | 89% | 2434 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 58,088 psi | 89% | 2477 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,174 psi | 88% | 2484 fps | 99.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2467 fps | 98.3% |
| Norma 201 | <<locked>> | 90% | 56,724 psi | 87% | 2448 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,290 psi | 88% | 2448 fps | 100% |
| Norma 203B | <<locked>> | 94% | 58,552 psi | 90% | 2526 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2480 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 51,982 psi | 80% | 2490 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 55,637 psi | 86% | 2510 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,024 psi | 78% | 2487 fps | 98.4% |
| Ramshot TAC | <<locked>> | 88% | 57,725 psi | 89% | 2480 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,188 psi | 88% | 2497 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 58,218 psi | 90% | 2461 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,723 psi | 55% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,768 psi | 87% | 2438 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,551 psi | 89% | 2490 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,391 psi | 87% | 2556 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,680 psi | 86% | 2585 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,344 psi | 81% | 2523 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,562 psi | 81% | 2546 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 88% | 57,870 psi | 89% | 2428 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,203 psi | 88% | 2448 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,521 psi | 85% | 2480 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,072 psi | 86% | 2461 fps | 97.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,174 psi | 88% | 2484 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,812 psi | 89% | 2477 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 58,088 psi | 89% | 2477 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2467 fps | 98.3% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,434 psi | 87% | 2415 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,450 psi | 88% | 2539 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,579 psi | 87% | 2385 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,970 psi | 86% | 2461 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,434 psi | 87% | 2477 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 58,668 psi | 90% | 2392 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 58,407 psi | 90% | 2388 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 2444 fps | 98.4% |
| Somchem S321 | <<locked>> | 86% | 58,726 psi | 90% | 2490 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,682 psi | 89% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,274 psi | 85% | 2451 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 55,999 psi | 86% | 2477 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,702 psi | 72% | 2451 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 58,523 psi | 90% | 2356 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 58,726 psi | 90% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,753 psi | 87% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,928 psi | 89% | 2431 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,624 psi | 89% | 2457 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,824 psi | 84% | 2487 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 88% | 57,957 psi | 89% | 2457 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,738 psi | 86% | 2431 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,795 psi | 83% | 2497 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,204 psi | 60% | 2343 fps | 98.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,463 psi | 85% | 2474 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,464 psi | 88% | 2500 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,289 psi | 87% | 2549 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,489 psi | 50% | 2270 fps | 98.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,405 psi | 87% | 2487 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% | 46,282 psi | 71% | 2244 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,720 psi | 78% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,088 psi | 60% | 2188 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,759 psi | 70% | 2316 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,063 psi | 68% | 2247 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 36,956 psi | 57% | 2185 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 30,618 psi | 47% | 2123 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 54,636 psi | 84% | 2310 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 55,071 psi | 85% | 2333 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,656 psi | 66% | 2280 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 36,289 psi | 56% | 2152 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,730 psi | 69% | 2287 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,773 psi | 69% | 2274 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,214 psi | 80% | 2457 fps | 100% |
| Alliant Power Pro 2000-MR | 50.2 gr | 80% | 38,609 psi | 59% | 2306 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,708 psi | 55% | 2172 fps | 98.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,098 psi | 80% | 2323 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,450 psi | 59% | 2224 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,633 psi | 49% | 2133 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,792 psi | 47% | 2142 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,703 psi | 44% | 2096 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,157 psi | 54% | 2303 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,751 psi | 83% | 2313 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,669 psi | 64% | 2283 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 35,186 psi | 54% | 2172 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 43,888 psi | 68% | 2283 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,601 psi | 72% | 2274 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,279 psi | 67% | 2306 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,413 psi | 73% | 2428 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 50,981 psi | 78% | 2359 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,808 psi | 80% | 2385 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,114 psi | 56% | 2175 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 40,495 psi | 62% | 2306 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 47,152 psi | 73% | 2372 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,018 psi | 66% | 2290 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,122 psi | 42% | 2001 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,841 psi | 60% | 2264 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 92% | 42,989 psi | 66% | 2369 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,368 psi | 41% | 1299 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,234 psi | 63% | 2247 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 42,496 psi | 65% | 2280 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,101 psi | 59% | 2178 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,698 psi | 63% | 2198 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,359 psi | 81% | 2287 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,685 psi | 67% | 2303 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,004 psi | 66% | 2270 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 31,879 psi | 49% | 2133 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,349 psi | 61% | 2251 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,730 psi | 69% | 2287 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,314 psi | 77% | 2356 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,452 psi | 64% | 2260 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,888 psi | 66% | 2224 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 37,942 psi | 58% | 2185 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,391 psi | 58% | 2178 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 40,045 psi | 62% | 2247 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 41,887 psi | 64% | 2241 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 41,974 psi | 65% | 2244 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,811 psi | 58% | 2215 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 49,777 psi | 77% | 2431 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 33,359 psi | 51% | 2172 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 37,260 psi | 57% | 2228 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 92% | 39,465 psi | 61% | 2297 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 44,512 psi | 68% | 2293 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,830 psi | 67% | 2306 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,240 psi | 74% | 2329 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 41% | 1329 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,038 psi | 77% | 2352 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,088 psi | 60% | 2208 fps | 95.3% |
| ReloadSwiss RS 52 | 48.6 gr | 80% | 39,943 psi | 61% | 2310 fps | 98.5% |
| ReloadSwiss RS 60 | 49.4 gr | 80% | 32,764 psi | 50% | 2201 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,706 psi | 50% | 2182 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,317 psi | 54% | 2238 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,716 psi | 70% | 2270 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,842 psi | 61% | 2198 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,199 psi | 51% | 2129 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 43,888 psi | 68% | 2283 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,391 psi | 58% | 2178 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,452 psi | 64% | 2260 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,942 psi | 58% | 2185 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 40,045 psi | 62% | 2247 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,910 psi | 81% | 2372 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,055 psi | 52% | 2169 fps | 97.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,939 psi | 81% | 2343 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,656 psi | 66% | 2267 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,046 psi | 63% | 2251 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,207 psi | 66% | 2195 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,839 psi | 55% | 2083 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,771 psi | 64% | 2221 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 48,167 psi | 74% | 2356 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,902 psi | 66% | 2198 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,453 psi | 65% | 2267 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 34,185 psi | 53% | 2133 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 24,671 psi | 38% | 1985 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,834 psi | 75% | 2244 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,482 psi | 67% | 2188 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,088 psi | 60% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,813 psi | 61% | 2192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,416 psi | 50% | 2080 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 32,851 psi | 51% | 2126 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,686 psi | 69% | 2280 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,203 psi | 59% | 2182 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,010 psi | 49% | 2126 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 30,487 psi | 47% | 2159 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,834 psi | 44% | 2018 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 44,106 psi | 68% | 2323 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,495 psi | 62% | 2306 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,732 psi | 44% | 2162 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,538 psi | 62% | 2260 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 Custom Competition. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,612 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,612 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 1:12.0 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 Custom Competition 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.