Load Specifications
Load data in caliber .338 Weatherby RPM with .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC 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 Power Pro 2000-MR, Hodgdon Superformance 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>> | 84% | 56,405 psi | 87% | 2402 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,421 psi | 90% | 2470 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,230 psi | 85% | 2428 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,942 psi | 88% | 2490 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,682 psi | 89% | 2484 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,916 psi | 64% | 2356 fps | 97.3% |
| Accurate 4064 | <<locked>> | 92% | 58,682 psi | 90% | 2513 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 58,668 psi | 90% | 2605 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 55,622 psi | 86% | 2503 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,521 psi | 87% | 2503 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,893 psi | 77% | 2490 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,088 psi | 89% | 2500 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,535 psi | 85% | 2428 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,013 psi | 85% | 2615 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,681 psi | 87% | 2526 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,043 psi | 88% | 2543 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 2608 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,406 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,689 psi | 75% | 2480 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,219 psi | 62% | 2385 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,860 psi | 69% | 2536 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,347 psi | 85% | 2523 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 57,392 psi | 88% | 2539 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,058 psi | 88% | 2516 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,289 psi | 87% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,566 psi | 89% | 2533 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,738 psi | 86% | 2575 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 58,668 psi | 90% | 2484 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 58,218 psi | 90% | 2556 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 98% | 57,711 psi | 89% | 2605 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 96% | 58,233 psi | 90% | 2569 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 86% | 56,173 psi | 86% | 2513 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,460 psi | 81% | 2497 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,608 psi | 86% | 2546 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 58,523 psi | 90% | 2648 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 55% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,363 psi | 88% | 2513 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,246 psi | 87% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,898 psi | 86% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,927 psi | 86% | 2474 fps | 98.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,406 psi | 88% | 2543 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,695 psi | 86% | 2500 fps | 98.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,274 psi | 85% | 2549 fps | 100% |
| IMR 4895 | <<locked>> | 90% | 58,508 psi | 90% | 2569 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 58,088 psi | 89% | 2500 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 58,334 psi | 90% | 2487 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,245 psi | 85% | 2477 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,305 psi | 90% | 2477 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,014 psi | 86% | 2484 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 58,421 psi | 90% | 2536 fps | 99.7% |
| Lovex S070 | <<locked>> | 98% | 55,970 psi | 86% | 2530 fps | 99% |
| Norma 201 | <<locked>> | 88% | 57,653 psi | 89% | 2493 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,262 psi | 90% | 2490 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,275 psi | 87% | 2533 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 2592 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 44,686 psi | 69% | 2493 fps | 96.8% |
| Norma URPᴾ | <<locked>> | 100% | 57,334 psi | 88% | 2592 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 56,985 psi | 88% | 2559 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,057 psi | 86% | 2595 fps | 99.4% |
| Ramshot TAC | <<locked>> | 86% | 58,334 psi | 90% | 2530 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,870 psi | 89% | 2539 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,100 psi | 85% | 2457 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 56% | 1529 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,363 psi | 88% | 2477 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 58,465 psi | 90% | 2539 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,943 psi | 89% | 2605 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,029 psi | 88% | 2635 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 2628 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2657 fps | 100% |
| Rottweil R 901 | <<locked>> | 86% | 58,711 psi | 90% | 2470 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 58,349 psi | 90% | 2493 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,014 psi | 88% | 2530 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,572 psi | 73% | 2467 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 96% | 57,058 psi | 88% | 2516 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 58,421 psi | 90% | 2536 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,245 psi | 85% | 2477 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,014 psi | 86% | 2484 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,970 psi | 86% | 2530 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,114 psi | 85% | 2543 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,840 psi | 87% | 2510 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,450 psi | 88% | 2523 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,912 psi | 86% | 2395 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,941 psi | 86% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,187 psi | 85% | 2451 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,137 psi | 73% | 2461 fps | 96% |
| Somchem S321 | <<locked>> | 82% | 55,666 psi | 86% | 2487 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,436 psi | 90% | 2431 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,420 psi | 87% | 2497 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,377 psi | 88% | 2526 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,808 psi | 80% | 2549 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,051 psi | 74% | 2448 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 82% | 55,434 psi | 85% | 2352 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,173 psi | 86% | 2379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,102 psi | 89% | 2454 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,230 psi | 85% | 2431 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,158 psi | 85% | 2464 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,550 psi | 87% | 2543 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 58,711 psi | 90% | 2500 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,898 psi | 88% | 2474 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,288 psi | 85% | 2549 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,193 psi | 68% | 2451 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,434 psi | 87% | 2523 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 58,552 psi | 90% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 58,001 psi | 89% | 2612 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,824 psi | 55% | 2398 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,348 psi | 88% | 2533 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% | 50,053 psi | 77% | 2323 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,810 psi | 84% | 2431 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,772 psi | 66% | 2267 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,792 psi | 77% | 2402 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,713 psi | 64% | 2244 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 34,301 psi | 53% | 2215 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,480 psi | 62% | 2267 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,689 psi | 46% | 2119 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 46,050 psi | 71% | 2365 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,204 psi | 60% | 2238 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 98% | 46,760 psi | 72% | 2441 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,124 psi | 74% | 2369 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,704 psi | 75% | 2346 fps | 100% |
| Alliant Power Pro 2000-MR | 54.7 gr | 80% | 42,047 psi | 65% | 2408 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,015 psi | 60% | 2260 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,756 psi | 64% | 2313 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,356 psi | 47% | 2133 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,562 psi | 52% | 2241 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 98% | 45,919 psi | 71% | 2434 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,295 psi | 40% | 2060 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 90% | 31,807 psi | 49% | 2257 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,252 psi | 70% | 2375 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 38,711 psi | 60% | 2267 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 41,959 psi | 65% | 2283 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,763 psi | 77% | 2352 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,181 psi | 73% | 2395 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,982 psi | 80% | 2523 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 55,245 psi | 85% | 2444 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,363 psi | 61% | 2267 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 38,972 psi | 60% | 2313 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 45,455 psi | 70% | 2379 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 46,470 psi | 71% | 2375 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,731 psi | 43% | 2047 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,540 psi | 65% | 2356 fps | 99.9% |
| Hodgdon Superformance | 62.6 gr | 88% | 41,191 psi | 63% | 2375 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 41% | 1332 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,512 psi | 68% | 2333 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 46,470 psi | 71% | 2362 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,191 psi | 63% | 2267 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,569 psi | 67% | 2287 fps | 96.6% |
| IMR 4350 | <<locked>> | 90% | 42,134 psi | 65% | 2313 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 38,696 psi | 60% | 2224 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 31,024 psi | 48% | 2136 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 42,743 psi | 66% | 2339 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 48,124 psi | 74% | 2369 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 54,723 psi | 84% | 2441 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,440 psi | 70% | 2349 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,919 psi | 71% | 2306 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 41,133 psi | 63% | 2270 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 33,866 psi | 52% | 2136 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 38,682 psi | 60% | 2251 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,165 psi | 69% | 2323 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,556 psi | 70% | 2326 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,147 psi | 63% | 2303 fps | 99.4% |
| Norma 204 | <<locked>> | 94% | 47,776 psi | 74% | 2441 fps | 95.6% |
| Norma MRP | <<locked>> | 96% | 39,334 psi | 61% | 2388 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 30,284 psi | 47% | 2126 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 40,770 psi | 63% | 2323 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 35,810 psi | 55% | 2254 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 47,906 psi | 74% | 2382 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,543 psi | 73% | 2398 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,851 psi | 80% | 2415 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 41% | 1365 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,853 psi | 83% | 2434 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,827 psi | 61% | 2254 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,193 psi | 68% | 2411 fps | 99.5% |
| ReloadSwiss RS 60 | 53.8 gr | 80% | 35,723 psi | 55% | 2297 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,502 psi | 48% | 2185 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,794 psi | 52% | 2238 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 49,342 psi | 76% | 2352 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,120 psi | 66% | 2283 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,477 psi | 56% | 2218 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 98% | 44,512 psi | 68% | 2415 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 41,959 psi | 65% | 2283 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,866 psi | 52% | 2136 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,440 psi | 70% | 2349 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,133 psi | 63% | 2270 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 38,682 psi | 60% | 2251 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,318 psi | 57% | 2264 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,499 psi | 72% | 2362 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,527 psi | 69% | 2343 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,398 psi | 71% | 2270 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,725 psi | 60% | 2159 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,045 psi | 62% | 2221 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 44,106 psi | 68% | 2411 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 52,054 psi | 80% | 2441 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,079 psi | 71% | 2274 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,050 psi | 71% | 2356 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,188 psi | 57% | 2221 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 27,050 psi | 42% | 2083 fps | 97.4% |
| Somchem S385 | <<locked>> | 96% | 42,177 psi | 65% | 2352 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,272 psi | 80% | 2316 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,789 psi | 72% | 2264 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,583 psi | 66% | 2257 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,221 psi | 66% | 2270 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,447 psi | 55% | 2165 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 31,488 psi | 48% | 2126 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 48,341 psi | 74% | 2369 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,423 psi | 64% | 2264 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 30,908 psi | 48% | 2126 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 28,094 psi | 43% | 2123 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,183 psi | 48% | 2106 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 48,080 psi | 74% | 2408 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 39,160 psi | 60% | 2316 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,165 psi | 40% | 2119 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,034 psi | 68% | 2346 fps | 99.9% |
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 124 powders for .338 Weatherby RPM loaded with the .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,657 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,657 fps. Accurate 3100 gives the best case fill at 100 %, and 124 of the 124 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Accurate MAGPRO 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .338 Weatherby RPM with the .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.