Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:225 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:1:13.5
Load data in caliber .338 Weatherby RPM with .338 | 225gr | Nosler AccuBond bullet and 107 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, ReloadSwiss RS 60 and Ramshot Big Game.
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>> | 88% | 56,855 psi | 87% | 2530 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,361 psi | 85% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 58,363 psi | 90% | 2592 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 57,116 psi | 88% | 2615 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 58,639 psi | 90% | 2595 fps | 97% |
| Accurate 4064 | <<locked>> | 96% | 57,943 psi | 89% | 2635 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,893 psi | 77% | 2608 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 56,043 psi | 86% | 2477 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,463 psi | 87% | 2500 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,854 psi | 86% | 2625 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 56,565 psi | 87% | 2618 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 57,159 psi | 88% | 2592 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 58,581 psi | 90% | 2625 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,317 psi | 85% | 2556 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,855 psi | 87% | 2677 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,172 psi | 85% | 2730 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,173 psi | 86% | 2638 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,710 psi | 87% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 57,188 psi | 88% | 2664 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,921 psi | 75% | 2612 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,029 psi | 88% | 2756 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,737 psi | 53% | 2365 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 58,697 psi | 90% | 2516 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,550 psi | 85% | 2638 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 56,782 psi | 87% | 2654 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2621 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,956 psi | 88% | 2562 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 57,667 psi | 89% | 2657 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,941 psi | 86% | 2700 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 55,666 psi | 86% | 2572 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,753 psi | 87% | 2602 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 58,349 psi | 90% | 2671 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,214 psi | 82% | 2654 fps | 97.2% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 58,218 psi | 90% | 2674 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 90% | 56,391 psi | 87% | 2635 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,107 psi | 69% | 2503 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,100 psi | 85% | 2661 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,534 psi | 84% | 2690 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,998 psi | 54% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,653 psi | 89% | 2635 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,898 psi | 86% | 2615 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,391 psi | 87% | 2605 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,811 psi | 87% | 2589 fps | 97.6% |
| IMR 4198 | <<locked>> | 84% | 56,913 psi | 88% | 2493 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,386 psi | 78% | 2546 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,927 psi | 86% | 2605 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,442 psi | 73% | 2552 fps | 98.6% |
| IMR 4895 | <<locked>> | 94% | 58,697 psi | 90% | 2690 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 58,581 psi | 90% | 2625 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,361 psi | 85% | 2569 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,230 psi | 85% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,796 psi | 86% | 2556 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 55,883 psi | 86% | 2602 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2598 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2579 fps | 97.1% |
| Norma 201 | <<locked>> | 92% | 58,044 psi | 89% | 2618 fps | 100% |
| Norma 202 | <<locked>> | 92% | 58,465 psi | 90% | 2618 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,333 psi | 87% | 2651 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 49,647 psi | 76% | 2602 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 94% | 56,652 psi | 87% | 2674 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,834 psi | 75% | 2595 fps | 97.2% |
| Ramshot TAC | <<locked>> | 88% | 55,463 psi | 85% | 2598 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 58,508 psi | 90% | 2664 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,188 psi | 86% | 2585 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 54% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 58,363 psi | 90% | 2612 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,143 psi | 85% | 2602 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 57,566 psi | 89% | 2726 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,869 psi | 87% | 2756 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,588 psi | 76% | 2631 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,386 psi | 78% | 2651 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 55,854 psi | 86% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 58,436 psi | 90% | 2615 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,623 psi | 87% | 2644 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2621 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2598 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,230 psi | 85% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,883 psi | 86% | 2602 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2579 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 58,233 psi | 90% | 2585 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 57,377 psi | 88% | 2602 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 58,523 psi | 90% | 2703 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 57,696 psi | 89% | 2552 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,261 psi | 88% | 2625 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,783 psi | 89% | 2644 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,637 psi | 87% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,362 psi | 87% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 2556 fps | 97.3% |
| Somchem S321 | <<locked>> | 86% | 56,434 psi | 87% | 2615 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,666 psi | 86% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,739 psi | 87% | 2618 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 56,956 psi | 88% | 2641 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,164 psi | 68% | 2552 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 56,521 psi | 87% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,637 psi | 87% | 2503 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,769 psi | 89% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,448 psi | 85% | 2556 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 58,726 psi | 90% | 2625 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,069 psi | 80% | 2598 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 55,463 psi | 85% | 2579 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 57,029 psi | 88% | 2598 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,227 psi | 79% | 2605 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,028 psi | 57% | 2434 fps | 96.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,968 psi | 81% | 2585 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,071 psi | 85% | 2625 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,490 psi | 82% | 2661 fps | 97.3% |
| Winchester StaBALL Match | <<locked>> | 92% | 57,551 psi | 89% | 2654 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% | 44,527 psi | 69% | 2365 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,501 psi | 75% | 2467 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,130 psi | 57% | 2293 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,540 psi | 67% | 2428 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 51,372 psi | 79% | 2497 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 35,114 psi | 54% | 2283 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 35,447 psi | 55% | 2352 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 52,721 psi | 81% | 2434 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,127 psi | 82% | 2457 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,799 psi | 63% | 2382 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 34,882 psi | 54% | 2251 fps | 95.9% |
| ADI AR 2219 | <<locked>> | 80% | 53,388 psi | 82% | 2543 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,844 psi | 66% | 2395 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 42,438 psi | 65% | 2388 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,864 psi | 77% | 2579 fps | 99.8% |
| Alliant Power Pro 2000-MR | 52.4 gr | 80% | 36,782 psi | 57% | 2398 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,055 psi | 52% | 2267 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,328 psi | 77% | 2454 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,651 psi | 56% | 2323 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,129 psi | 56% | 2362 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 82% | 31,328 psi | 48% | 2277 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,850 psi | 47% | 2267 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,880 psi | 80% | 2434 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,842 psi | 61% | 2385 fps | 97% |
| Bofors RP3 | <<locked>> | 80% | 33,547 psi | 52% | 2270 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 47,645 psi | 73% | 2480 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,889 psi | 69% | 2388 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,147 psi | 63% | 2411 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,353 psi | 70% | 2539 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 49,052 psi | 75% | 2487 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,734 psi | 77% | 2507 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 36,927 psi | 57% | 2320 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 43,961 psi | 68% | 2507 fps | 95% |
| Hodgdon H4350 | <<locked>> | 96% | 51,213 psi | 79% | 2572 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 41,147 psi | 63% | 2395 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,125 psi | 48% | 2221 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,999 psi | 57% | 2365 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 96% | 47,369 psi | 73% | 2575 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 40% | 1381 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,682 psi | 61% | 2352 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 40,553 psi | 62% | 2398 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,535 psi | 56% | 2280 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,036 psi | 72% | 2441 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 50,720 psi | 78% | 2415 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 47,398 psi | 73% | 2500 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 46,499 psi | 72% | 2461 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 34,330 psi | 53% | 2313 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 37,521 psi | 58% | 2349 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 42,844 psi | 66% | 2395 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 48,182 psi | 74% | 2470 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,479 psi | 61% | 2365 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 41,365 psi | 64% | 2333 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 36,361 psi | 56% | 2287 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 40,466 psi | 62% | 2365 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 43,265 psi | 67% | 2434 fps | 95% |
| Norma 201 | <<locked>> | 80% | 40,190 psi | 62% | 2346 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 40,176 psi | 62% | 2352 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,042 psi | 55% | 2313 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 36,100 psi | 56% | 2356 fps | 95.6% |
| Ramshot Big Game | 52.4 gr | 80% | 35,404 psi | 54% | 2320 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 96% | 42,830 psi | 66% | 2490 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 42,815 psi | 66% | 2398 fps | 96.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,974 psi | 65% | 2415 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,470 psi | 71% | 2441 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,339 psi | 41% | 1414 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,109 psi | 74% | 2474 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 42,670 psi | 66% | 2405 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,927 psi | 58% | 2408 fps | 97.1% |
| ReloadSwiss RS 60 | 51.6 gr | 80% | 31,256 psi | 48% | 2287 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,288 psi | 54% | 2365 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,493 psi | 59% | 2428 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 44,048 psi | 68% | 2388 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,232 psi | 59% | 2303 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 31,531 psi | 49% | 2218 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 47,645 psi | 73% | 2480 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,466 psi | 62% | 2365 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,479 psi | 61% | 2365 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 36,361 psi | 56% | 2287 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 43,265 psi | 67% | 2434 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,691 psi | 78% | 2487 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,809 psi | 83% | 2556 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,503 psi | 50% | 2260 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,082 psi | 79% | 2470 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,785 psi | 63% | 2369 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,305 psi | 60% | 2356 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,756 psi | 64% | 2310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,490 psi | 53% | 2188 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 45,527 psi | 70% | 2411 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 46,180 psi | 71% | 2470 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,263 psi | 63% | 2313 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,596 psi | 62% | 2372 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 32,648 psi | 50% | 2228 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 26,643 psi | 41% | 2159 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,239 psi | 73% | 2369 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,959 psi | 65% | 2306 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,391 psi | 58% | 2293 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,058 psi | 59% | 2297 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,864 psi | 47% | 2172 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 35,534 psi | 55% | 2310 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 42,946 psi | 66% | 2392 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 36,579 psi | 56% | 2287 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 37,028 psi | 57% | 2362 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 32,634 psi | 50% | 2336 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,357 psi | 48% | 2192 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 41,989 psi | 65% | 2428 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 43,961 psi | 68% | 2507 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,609 psi | 59% | 2359 fps | 98.3% |
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 107 powders for .338 Weatherby RPM loaded with the .338 | 225gr | Nosler AccuBond. Alliant Reloder-17 delivers the highest muzzle velocity at 2,756 fps; across all powders the maximum-charge window runs from 1,549 fps to 2,756 fps. Accurate 4350 gives the best case fill at 100 %, and 107 of the 107 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 225.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 60, Ramshot Big Game rank at the top here: for .338 Weatherby RPM with the .338 | 225gr | 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.