Load Specifications
Bullet:.338 | 225gr | Woodleigh HS
Bullet Manufacturer:Woodleigh
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:1:15.5
Load data in caliber .338 Weatherby RPM with .338 | 225gr | Woodleigh HS bullet and 107 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% | 56,101 psi | 86% | 2539 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,986 psi | 89% | 2608 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,812 psi | 89% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,492 psi | 87% | 2628 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,508 psi | 88% | 2608 fps | 97.3% |
| Accurate 4064 | <<locked>> | 94% | 57,682 psi | 89% | 2648 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,461 psi | 82% | 2677 fps | 99.5% |
| Accurate LT-30 | <<locked>> | 82% | 58,247 psi | 90% | 2523 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,740 psi | 90% | 2549 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 58,523 psi | 90% | 2680 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,927 psi | 86% | 2631 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,580 psi | 89% | 2635 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 58,552 psi | 90% | 2608 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,941 psi | 86% | 2687 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 58,320 psi | 90% | 2799 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,695 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,651 psi | 86% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,420 psi | 87% | 2674 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,750 psi | 80% | 2680 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,391 psi | 87% | 2769 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,840 psi | 57% | 2434 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,814 psi | 63% | 2575 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,595 psi | 89% | 2526 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 58,624 psi | 90% | 2700 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 56,420 psi | 87% | 2671 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,507 psi | 87% | 2638 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,086 psi | 86% | 2575 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,826 psi | 87% | 2664 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,071 psi | 85% | 2707 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 58,537 psi | 90% | 2628 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,869 psi | 86% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,421 psi | 88% | 2680 fps | 99.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2726 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 98% | 57,682 psi | 89% | 2690 fps | 97% |
| Hodgdon H4895 | <<locked>> | 88% | 55,521 psi | 85% | 2644 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,935 psi | 74% | 2569 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 58,494 psi | 90% | 2723 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,769 psi | 89% | 2762 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 54% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,797 psi | 87% | 2644 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,376 psi | 85% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,622 psi | 86% | 2618 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,782 psi | 86% | 2598 fps | 97.8% |
| IMR 4198 | <<locked>> | 82% | 55,680 psi | 86% | 2497 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,026 psi | 82% | 2612 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 58,450 psi | 90% | 2667 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,720 psi | 78% | 2621 fps | 99.3% |
| IMR 4895 | <<locked>> | 92% | 57,841 psi | 89% | 2703 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,580 psi | 89% | 2635 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 58,073 psi | 89% | 2625 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 58,363 psi | 90% | 2661 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 58,102 psi | 89% | 2612 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 58,798 psi | 90% | 2661 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,725 psi | 89% | 2661 fps | 99.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,013 psi | 85% | 2644 fps | 97.9% |
| Norma 201 | <<locked>> | 90% | 57,116 psi | 88% | 2628 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,841 psi | 89% | 2631 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,579 psi | 86% | 2661 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 52,692 psi | 81% | 2667 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 92% | 56,173 psi | 86% | 2687 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,547 psi | 79% | 2661 fps | 98% |
| Ramshot TAC | <<locked>> | 88% | 58,160 psi | 89% | 2661 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,508 psi | 88% | 2674 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,158 psi | 85% | 2592 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 55% | 1614 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,246 psi | 88% | 2618 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 58,088 psi | 89% | 2667 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,913 psi | 88% | 2740 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,072 psi | 86% | 2766 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,011 psi | 82% | 2700 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,142 psi | 82% | 2723 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 88% | 58,334 psi | 90% | 2608 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,754 psi | 89% | 2628 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,999 psi | 86% | 2657 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,507 psi | 87% | 2638 fps | 97.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,725 psi | 89% | 2661 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 58,363 psi | 90% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 58,798 psi | 90% | 2661 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,013 psi | 85% | 2644 fps | 97.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,927 psi | 88% | 2592 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,870 psi | 89% | 2717 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,579 psi | 87% | 2559 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,478 psi | 87% | 2638 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,869 psi | 87% | 2654 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,521 psi | 85% | 2526 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,521 psi | 85% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 58,392 psi | 90% | 2618 fps | 98.1% |
| Somchem S321 | <<locked>> | 84% | 55,434 psi | 85% | 2625 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 58,030 psi | 89% | 2566 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,014 psi | 86% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,289 psi | 87% | 2654 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,007 psi | 72% | 2618 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 58,769 psi | 90% | 2533 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,666 psi | 86% | 2513 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,305 psi | 88% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 58,421 psi | 90% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 58,030 psi | 89% | 2635 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,405 psi | 85% | 2664 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 88% | 58,204 psi | 90% | 2635 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,333 psi | 87% | 2608 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,273 psi | 83% | 2667 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,740 psi | 61% | 2503 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2648 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 58,073 psi | 89% | 2680 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,913 psi | 88% | 2730 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,822 psi | 50% | 2421 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,826 psi | 87% | 2664 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% | 46,702 psi | 72% | 2415 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,850 psi | 78% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,247 psi | 60% | 2346 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,093 psi | 71% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,253 psi | 73% | 2457 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 37,130 psi | 57% | 2339 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,996 psi | 51% | 2313 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 54,723 psi | 84% | 2480 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 55,158 psi | 85% | 2507 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,801 psi | 66% | 2441 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 36,506 psi | 56% | 2303 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,889 psi | 69% | 2448 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,860 psi | 69% | 2438 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,431 psi | 81% | 2638 fps | 100% |
| Alliant Power Pro 2000-MR | 55.2 gr | 80% | 38,754 psi | 60% | 2464 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,998 psi | 55% | 2326 fps | 98.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,446 psi | 81% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,609 psi | 59% | 2379 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,823 psi | 52% | 2329 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,038 psi | 48% | 2290 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,748 psi | 47% | 2287 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,549 psi | 55% | 2454 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,056 psi | 83% | 2484 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,974 psi | 65% | 2444 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 35,476 psi | 55% | 2326 fps | 98.3% |
| Bofors RP7 | <<locked>> | 92% | 47,036 psi | 72% | 2493 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,702 psi | 72% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,526 psi | 67% | 2470 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,935 psi | 74% | 2598 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 51,445 psi | 79% | 2536 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,272 psi | 80% | 2562 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,463 psi | 56% | 2329 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 92% | 43,598 psi | 67% | 2520 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 94% | 50,865 psi | 78% | 2592 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 43,207 psi | 66% | 2451 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,095 psi | 45% | 2188 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,044 psi | 60% | 2425 fps | 99% |
| Hodgdon Superformance | <<locked>> | 94% | 46,630 psi | 72% | 2589 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 41% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,611 psi | 64% | 2408 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 42,801 psi | 66% | 2448 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,305 psi | 59% | 2333 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,584 psi | 67% | 2405 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,692 psi | 81% | 2461 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 47,050 psi | 72% | 2516 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,178 psi | 66% | 2425 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 34,243 psi | 53% | 2326 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,537 psi | 61% | 2408 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,889 psi | 69% | 2448 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,720 psi | 78% | 2526 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,785 psi | 64% | 2425 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,076 psi | 66% | 2382 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 38,130 psi | 59% | 2339 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 37,681 psi | 58% | 2329 fps | 95% |
| Lovex S070 | <<locked>> | 92% | 43,062 psi | 66% | 2451 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 42,032 psi | 65% | 2398 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 42,308 psi | 65% | 2408 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,000 psi | 58% | 2369 fps | 98% |
| Norma URP | <<locked>> | 86% | 33,591 psi | 52% | 2320 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,420 psi | 58% | 2382 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 39,987 psi | 62% | 2457 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 44,831 psi | 69% | 2454 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,222 psi | 68% | 2474 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,443 psi | 75% | 2493 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 41% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,241 psi | 77% | 2523 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,959 psi | 65% | 2411 fps | 95.5% |
| ReloadSwiss RS 52 | 53.5 gr | 80% | 40,277 psi | 62% | 2474 fps | 98% |
| ReloadSwiss RS 60 | 54.4 gr | 80% | 33,054 psi | 51% | 2352 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,099 psi | 54% | 2382 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,014 psi | 58% | 2444 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,948 psi | 71% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,103 psi | 62% | 2356 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 33,475 psi | 51% | 2277 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 47,036 psi | 72% | 2493 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,681 psi | 58% | 2329 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,785 psi | 64% | 2425 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,130 psi | 59% | 2339 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 43,062 psi | 66% | 2451 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,127 psi | 82% | 2543 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,330 psi | 53% | 2320 fps | 96.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,243 psi | 82% | 2516 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,975 psi | 66% | 2428 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,321 psi | 64% | 2411 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,482 psi | 67% | 2356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,071 psi | 55% | 2234 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,875 psi | 69% | 2421 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,515 psi | 75% | 2523 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,076 psi | 66% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,757 psi | 66% | 2428 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 34,316 psi | 53% | 2283 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 26,411 psi | 41% | 2169 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 49,139 psi | 76% | 2411 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,772 psi | 67% | 2352 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,334 psi | 61% | 2339 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,074 psi | 62% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,648 psi | 50% | 2224 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 35,114 psi | 54% | 2320 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 45,005 psi | 69% | 2444 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 38,566 psi | 59% | 2339 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,447 psi | 53% | 2323 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 32,793 psi | 50% | 2356 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,037 psi | 45% | 2156 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 44,498 psi | 68% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,598 psi | 67% | 2520 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,893 psi | 48% | 2362 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,843 psi | 63% | 2418 fps | 99% |
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 | Woodleigh HS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,799 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,799 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 50–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 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 | 225gr | Woodleigh HS 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.