Load Specifications
Bullet Manufacturer:Prvi Partizan
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 | Prvi Partizan FMJ-BT bullet and 108 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 57,159 psi | 88% | 2388 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,434 psi | 85% | 2418 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,492 psi | 85% | 2415 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,551 psi | 89% | 2477 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 58,494 psi | 90% | 2467 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 38,783 psi | 60% | 2283 fps | 96% |
| Accurate 4064 | <<locked>> | 92% | 55,376 psi | 85% | 2457 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2536 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 88% | 56,144 psi | 86% | 2490 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,884 psi | 88% | 2484 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 58,755 psi | 90% | 2487 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,057 psi | 86% | 2415 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,072 psi | 88% | 2533 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,463 psi | 85% | 2595 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,898 psi | 88% | 2507 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,623 psi | 87% | 2388 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,537 psi | 89% | 2526 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,620 psi | 81% | 2536 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,479 psi | 88% | 2618 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,565 psi | 58% | 2313 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,669 psi | 64% | 2451 fps | 98.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 58,349 psi | 90% | 2375 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,709 psi | 86% | 2507 fps | 99.9% |
| Bofors RP3 | <<locked>> | 94% | 57,493 psi | 88% | 2520 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,522 psi | 88% | 2497 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,072 psi | 88% | 2428 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,914 psi | 89% | 2516 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,275 psi | 87% | 2559 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,927 psi | 86% | 2431 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,768 psi | 87% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 58,508 psi | 90% | 2533 fps | 99.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 2582 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 98% | 58,798 psi | 90% | 2549 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 88% | 56,739 psi | 87% | 2497 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,805 psi | 75% | 2428 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,782 psi | 86% | 2526 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,926 psi | 85% | 2572 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 55% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,914 psi | 89% | 2497 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,681 psi | 87% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,391 psi | 87% | 2467 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,652 psi | 87% | 2457 fps | 98.5% |
| IMR 4198 | <<locked>> | 82% | 56,710 psi | 87% | 2346 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,114 psi | 83% | 2474 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,043 psi | 86% | 2477 fps | 98.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,648 psi | 79% | 2484 fps | 99.7% |
| IMR 4895 | <<locked>> | 90% | 55,521 psi | 85% | 2510 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 58,755 psi | 90% | 2487 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,187 psi | 85% | 2428 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,767 psi | 86% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,680 psi | 86% | 2421 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 56,289 psi | 87% | 2467 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2513 fps | 99.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,159 psi | 86% | 2503 fps | 98.7% |
| Norma 201 | <<locked>> | 90% | 58,291 psi | 90% | 2480 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,361 psi | 85% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,681 psi | 87% | 2516 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 2520 fps | 96.6% |
| Norma URPᴾ | <<locked>> | 100% | 53,911 psi | 83% | 2526 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 92% | 57,232 psi | 88% | 2539 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,591 psi | 81% | 2523 fps | 98.8% |
| Ramshot TAC | <<locked>> | 86% | 55,288 psi | 85% | 2464 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 58,523 psi | 90% | 2523 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,173 psi | 86% | 2448 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,940 psi | 55% | 1503 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 58,088 psi | 89% | 2464 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,245 psi | 85% | 2474 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,986 psi | 89% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,174 psi | 88% | 2615 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,143 psi | 83% | 2556 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,259 psi | 83% | 2585 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 86% | 55,767 psi | 86% | 2415 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 58,740 psi | 90% | 2477 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,363 psi | 88% | 2513 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,522 psi | 88% | 2497 fps | 98.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2513 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,767 psi | 86% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,289 psi | 87% | 2467 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,159 psi | 86% | 2503 fps | 98.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,972 psi | 89% | 2444 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,245 psi | 85% | 2523 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,653 psi | 89% | 2408 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,363 psi | 88% | 2490 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,769 psi | 89% | 2507 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,666 psi | 87% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,478 psi | 87% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,579 psi | 86% | 2431 fps | 98.3% |
| Somchem S321 | <<locked>> | 84% | 56,347 psi | 87% | 2474 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,753 psi | 86% | 2379 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,884 psi | 88% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 57,392 psi | 88% | 2507 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,182 psi | 74% | 2480 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 44,962 psi | 69% | 2379 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 84% | 56,405 psi | 87% | 2346 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,811 psi | 87% | 2365 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 58,523 psi | 90% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,840 psi | 86% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,622 psi | 86% | 2448 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,405 psi | 87% | 2520 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 55,622 psi | 86% | 2441 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,363 psi | 88% | 2461 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 2526 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,698 psi | 63% | 2379 fps | 98.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,884 psi | 88% | 2503 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,477 psi | 85% | 2487 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 2589 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,518 psi | 52% | 2316 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,740 psi | 89% | 2516 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% | 47,543 psi | 73% | 2274 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,808 psi | 80% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,248 psi | 62% | 2215 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,862 psi | 72% | 2343 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,049 psi | 69% | 2280 fps | 95.5% |
| Accurate 3100 | <<locked>> | 98% | 36,245 psi | 56% | 2238 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,087 psi | 59% | 2211 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,589 psi | 49% | 2152 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 43,700 psi | 67% | 2306 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,260 psi | 57% | 2182 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,745 psi | 70% | 2313 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 45,876 psi | 71% | 2293 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,519 psi | 82% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | 51.6 gr | 80% | 39,653 psi | 61% | 2339 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,724 psi | 56% | 2201 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,490 psi | 82% | 2349 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,465 psi | 61% | 2254 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,387 psi | 50% | 2165 fps | 95.8% |
| Alliant Reloder-17 | 50.8 gr | 80% | 31,705 psi | 49% | 2178 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,876 psi | 43% | 2083 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 33,953 psi | 52% | 2287 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,839 psi | 84% | 2336 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,757 psi | 66% | 2313 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 36,230 psi | 56% | 2205 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 42,424 psi | 65% | 2270 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,630 psi | 73% | 2303 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,483 psi | 68% | 2336 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,037 psi | 75% | 2461 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 52,489 psi | 81% | 2388 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,098 psi | 82% | 2411 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,260 psi | 57% | 2208 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 90% | 41,698 psi | 64% | 2343 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 90% | 45,701 psi | 70% | 2362 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 44,063 psi | 68% | 2316 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,862 psi | 43% | 2031 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,045 psi | 62% | 2297 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 92% | 44,338 psi | 68% | 2408 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 41% | 1309 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,438 psi | 65% | 2277 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 43,787 psi | 67% | 2310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,073 psi | 60% | 2208 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,582 psi | 64% | 2228 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 53,519 psi | 82% | 2310 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 42,366 psi | 65% | 2293 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,394 psi | 64% | 2254 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 30,864 psi | 47% | 2116 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,437 psi | 62% | 2280 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 45,745 psi | 70% | 2313 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 51,590 psi | 79% | 2382 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,743 psi | 66% | 2290 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,903 psi | 68% | 2251 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 39,001 psi | 60% | 2211 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 36,143 psi | 56% | 2162 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 38,754 psi | 60% | 2234 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 42,975 psi | 66% | 2267 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 43,076 psi | 66% | 2270 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,856 psi | 60% | 2244 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 47,906 psi | 74% | 2418 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 32,271 psi | 50% | 2156 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,319 psi | 59% | 2260 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 38,116 psi | 59% | 2280 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 45,585 psi | 70% | 2323 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,976 psi | 69% | 2339 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,356 psi | 76% | 2356 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 41% | 1339 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,372 psi | 79% | 2382 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 37,695 psi | 58% | 2192 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,336 psi | 64% | 2346 fps | 98.9% |
| ReloadSwiss RS 60 | 50.8 gr | 80% | 33,721 psi | 52% | 2234 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 31,560 psi | 49% | 2169 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,274 psi | 56% | 2270 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 46,905 psi | 72% | 2297 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,915 psi | 63% | 2228 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,200 psi | 53% | 2156 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 42,424 psi | 65% | 2270 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,143 psi | 56% | 2162 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,743 psi | 66% | 2290 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,001 psi | 60% | 2211 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 38,754 psi | 60% | 2234 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 54,230 psi | 83% | 2398 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,099 psi | 54% | 2201 fps | 97.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,360 psi | 84% | 2369 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,772 psi | 67% | 2300 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,221 psi | 65% | 2283 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,367 psi | 68% | 2221 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,840 psi | 57% | 2110 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,292 psi | 62% | 2208 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 49,342 psi | 76% | 2382 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,961 psi | 68% | 2224 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,584 psi | 67% | 2297 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 35,186 psi | 54% | 2165 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 25,512 psi | 39% | 2021 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 42,221 psi | 65% | 2333 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,053 psi | 77% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,657 psi | 69% | 2215 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,306 psi | 62% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,857 psi | 63% | 2218 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,344 psi | 51% | 2110 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 31,560 psi | 49% | 2110 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 45,730 psi | 70% | 2306 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,320 psi | 60% | 2211 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,996 psi | 51% | 2156 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 29,631 psi | 46% | 2149 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,559 psi | 45% | 2044 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 45,440 psi | 70% | 2352 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 39,146 psi | 60% | 2293 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,746 psi | 43% | 2146 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,481 psi | 64% | 2287 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 | Prvi Partizan FMJ-BT. Alliant Reloder-17 delivers the highest muzzle velocity at 2,618 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,618 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 52–90 %, 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Prvi Partizan FMJ-BT 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.