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:1:12.0
Load data in caliber .338 Weatherby RPM with .338 | 225gr | Nosler Expansion Tip 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, Hodgdon CFE223 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>> | 90% | 56,623 psi | 87% | 2516 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,261 psi | 88% | 2618 fps | 99.6% |
| Accurate 2230 | <<locked>> | 82% | 58,218 psi | 90% | 2628 fps | 99.8% |
| Accurate 2460 | <<locked>> | 86% | 55,129 psi | 85% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,145 psi | 88% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 56,840 psi | 87% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 96% | 58,682 psi | 90% | 2579 fps | 96.7% |
| Accurate 4064 | <<locked>> | 98% | 56,913 psi | 88% | 2615 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,629 psi | 70% | 2533 fps | 98% |
| Accurate LT-30 | <<locked>> | 84% | 56,811 psi | 87% | 2470 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,261 psi | 88% | 2493 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,753 psi | 86% | 2608 fps | 99.8% |
| ADI AR 2207 | <<locked>> | 82% | 58,494 psi | 90% | 2480 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 56,884 psi | 88% | 2605 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 84% | 57,493 psi | 88% | 2585 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 58,668 psi | 90% | 2612 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 58,624 psi | 90% | 2585 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,332 psi | 85% | 2717 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,898 psi | 86% | 2621 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,652 psi | 87% | 2523 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,971 psi | 88% | 2644 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,832 psi | 71% | 2543 fps | 98.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,939 psi | 81% | 2684 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,883 psi | 86% | 2474 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,506 psi | 85% | 2625 fps | 99.4% |
| Bofors RP3 | <<locked>> | 98% | 56,405 psi | 87% | 2638 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2552 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,290 psi | 88% | 2552 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 57,783 psi | 89% | 2648 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,782 psi | 86% | 2684 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 86% | 55,970 psi | 86% | 2566 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,305 psi | 88% | 2595 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 58,030 psi | 89% | 2651 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,661 psi | 76% | 2585 fps | 96.1% |
| Hodgdon H4198 | <<locked>> | 82% | 58,697 psi | 90% | 2513 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 56,231 psi | 87% | 2618 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,843 psi | 64% | 2434 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,143 psi | 85% | 2651 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 53% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 57,885 psi | 89% | 2621 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 55,680 psi | 86% | 2605 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,246 psi | 87% | 2589 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,014 psi | 88% | 2572 fps | 97.3% |
| IMR 4198 | <<locked>> | 86% | 57,087 psi | 88% | 2484 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2589 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,671 psi | 67% | 2484 fps | 97.7% |
| IMR 4895 | <<locked>> | 96% | 58,378 psi | 90% | 2674 fps | 100% |
| IMR 8208 XBR | <<locked>> | 92% | 58,668 psi | 90% | 2612 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,230 psi | 85% | 2556 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 58,653 psi | 90% | 2635 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,927 psi | 86% | 2543 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 55,419 psi | 85% | 2585 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,024 psi | 78% | 2530 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,457 psi | 75% | 2510 fps | 96% |
| Norma 200 | <<locked>> | 82% | 56,434 psi | 87% | 2497 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,870 psi | 89% | 2605 fps | 100% |
| Norma 202 | <<locked>> | 94% | 58,436 psi | 90% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,999 psi | 86% | 2635 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 45,919 psi | 71% | 2533 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 96% | 56,739 psi | 87% | 2661 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,382 psi | 70% | 2523 fps | 95.9% |
| Ramshot TAC | <<locked>> | 90% | 55,796 psi | 86% | 2589 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 92% | 58,537 psi | 90% | 2651 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,666 psi | 87% | 2575 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,780 psi | 54% | 1562 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 58,639 psi | 90% | 2602 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,940 psi | 85% | 2585 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,145 psi | 88% | 2710 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,637 psi | 87% | 2740 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,440 psi | 70% | 2552 fps | 97.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,891 psi | 72% | 2575 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 92% | 58,610 psi | 90% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 57,986 psi | 89% | 2595 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 2625 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2552 fps | 96.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,024 psi | 78% | 2530 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 94% | 58,653 psi | 90% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,419 psi | 85% | 2585 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,457 psi | 75% | 2510 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 58,755 psi | 90% | 2575 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,029 psi | 88% | 2234 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 57,827 psi | 89% | 2595 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2690 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,827 psi | 89% | 2543 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,551 psi | 89% | 2612 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 57,827 psi | 89% | 2631 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,869 psi | 87% | 2510 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,318 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 2490 fps | 96.3% |
| Somchem S321 | <<locked>> | 88% | 56,420 psi | 87% | 2605 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,492 psi | 85% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,797 psi | 87% | 2602 fps | 99.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2621 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,698 psi | 63% | 2480 fps | 99.5% |
| Vihtavuori N120 | <<locked>> | 82% | 58,262 psi | 90% | 2431 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 56,463 psi | 87% | 2474 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,840 psi | 87% | 2493 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,406 psi | 88% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,390 psi | 85% | 2543 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2566 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,399 psi | 74% | 2530 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 90% | 55,753 psi | 86% | 2569 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 57,000 psi | 88% | 2585 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,340 psi | 73% | 2536 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,559 psi | 76% | 2523 fps | 99.7% |
| Winchester 748 | <<locked>> | 92% | 58,697 psi | 90% | 2657 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 49,661 psi | 76% | 2585 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 94% | 57,537 psi | 89% | 2641 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% | 41,452 psi | 64% | 2313 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,592 psi | 82% | 2566 fps | 99.3% |
| Accurate 2230 | <<locked>> | 80% | 54,114 psi | 83% | 2575 fps | 99.5% |
| Accurate 2460 | <<locked>> | 80% | 45,005 psi | 69% | 2408 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,475 psi | 51% | 2228 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,219 psi | 62% | 2365 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 51,547 psi | 79% | 2484 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 31,705 psi | 49% | 2215 fps | 99.2% |
| Accurate 4350 | <<locked>> | 94% | 36,927 psi | 57% | 2379 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 50,198 psi | 77% | 2388 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,604 psi | 78% | 2408 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,000 psi | 58% | 2320 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 80% | 55,042 psi | 85% | 2441 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 34,577 psi | 53% | 2234 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 50,314 psi | 77% | 2493 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,089 psi | 62% | 2336 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 39,291 psi | 60% | 2336 fps | 100% |
| Alliant Power Pro 2000-MR | 51.5 gr | 82% | 36,782 psi | 57% | 2385 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,444 psi | 48% | 2205 fps | 96.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,166 psi | 73% | 2402 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,895 psi | 52% | 2257 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 35,839 psi | 55% | 2343 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 84% | 30,966 psi | 48% | 2257 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,008 psi | 75% | 2385 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,970 psi | 57% | 2320 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 30,589 psi | 47% | 2198 fps | 96.2% |
| Bofors RP7 | <<locked>> | 98% | 50,459 psi | 78% | 2507 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,206 psi | 65% | 2333 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,116 psi | 59% | 2349 fps | 99% |
| Hodgdon CFE223 | 51.4 gr | 80% | 42,105 psi | 65% | 2470 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 45,992 psi | 71% | 2431 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,688 psi | 72% | 2454 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 38,928 psi | 60% | 2352 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 46,485 psi | 72% | 2536 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 55,274 psi | 85% | 2470 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 38,290 psi | 59% | 2333 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,501 psi | 47% | 2198 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,229 psi | 53% | 2297 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,657 psi | 39% | 1362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,057 psi | 57% | 2293 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 37,492 psi | 58% | 2339 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,113 psi | 52% | 2218 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,355 psi | 73% | 2431 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 48,022 psi | 74% | 2369 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,499 psi | 72% | 2448 fps | 95% |
| IMR 4831 | <<locked>> | 94% | 35,824 psi | 55% | 2336 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 34,693 psi | 53% | 2283 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 40,089 psi | 62% | 2336 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 44,846 psi | 69% | 2415 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 36,347 psi | 56% | 2303 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 39,015 psi | 60% | 2277 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 33,649 psi | 52% | 2224 fps | 97.5% |
| Lovex S065 | <<locked>> | 94% | 42,496 psi | 65% | 2392 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 45,426 psi | 70% | 2461 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 52,895 psi | 81% | 2454 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,188 psi | 57% | 2283 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 37,449 psi | 58% | 2297 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,301 psi | 51% | 2247 fps | 96% |
| Norma URP | <<locked>> | 92% | 35,389 psi | 54% | 2333 fps | 95% |
| Ramshot Big Game | 50.2 gr | 80% | 32,808 psi | 50% | 2254 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 98% | 42,322 psi | 65% | 2467 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 39,958 psi | 61% | 2333 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,175 psi | 60% | 2352 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,482 psi | 67% | 2379 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,817 psi | 40% | 1394 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,266 psi | 70% | 2418 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 45,324 psi | 70% | 2438 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,085 psi | 54% | 2343 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,892 psi | 44% | 2211 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 36,985 psi | 57% | 2395 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 40,944 psi | 63% | 2464 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 40,872 psi | 63% | 2329 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,433 psi | 55% | 2241 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 28,631 psi | 44% | 2146 fps | 95% |
| Rottweil R 907 | <<locked>> | 98% | 50,459 psi | 78% | 2507 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 42,496 psi | 65% | 2392 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,347 psi | 56% | 2303 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 33,649 psi | 52% | 2224 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 98% | 45,426 psi | 70% | 2461 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,747 psi | 73% | 2431 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,070 psi | 83% | 2201 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,647 psi | 78% | 2503 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,169 psi | 49% | 2244 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,080 psi | 74% | 2421 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 37,927 psi | 58% | 2303 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,724 psi | 56% | 2297 fps | 97% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,088 psi | 60% | 2254 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,024 psi | 49% | 2133 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,298 psi | 74% | 2441 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 42,960 psi | 66% | 2405 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 38,406 psi | 59% | 2254 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,623 psi | 58% | 2306 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 29,863 psi | 46% | 2159 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 27,717 psi | 43% | 2182 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 54,897 psi | 84% | 2395 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 44,411 psi | 68% | 2320 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,276 psi | 60% | 2254 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,432 psi | 53% | 2234 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,273 psi | 54% | 2238 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 28,282 psi | 44% | 2106 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 37,260 psi | 57% | 2336 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 40,132 psi | 62% | 2333 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 33,953 psi | 52% | 2228 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 36,376 psi | 56% | 2339 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,053 psi | 48% | 2175 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 38,928 psi | 60% | 2369 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 46,485 psi | 72% | 2536 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,752 psi | 55% | 2293 fps | 97.4% |
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 | 225gr | Nosler Expansion Tip. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,740 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,740 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 53–90 %, leaving at least 10 % headroom. The 225.0 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-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, Hodgdon CFE223, Ramshot Big Game rank at the top here: for .338 Weatherby RPM with the .338 | 225gr | Nosler Expansion Tip 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.