Load Specifications
Bullet:.338 | 225gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:16.5
Load data in caliber .338 Weatherby RPM with .338 | 225gr | Swift A-Frame 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 Alliant Reloder-17.
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% | 56,681 psi | 87% | 2549 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 58,798 psi | 90% | 2625 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 58,682 psi | 90% | 2615 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,029 psi | 88% | 2638 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 58,160 psi | 89% | 2621 fps | 97.5% |
| Accurate 4064 | <<locked>> | 94% | 58,247 psi | 90% | 2657 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,259 psi | 83% | 2694 fps | 99.6% |
| Accurate LT-30 | <<locked>> | 82% | 58,566 psi | 90% | 2533 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 55,477 psi | 85% | 2644 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,608 psi | 87% | 2644 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 58,073 psi | 89% | 2644 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,376 psi | 85% | 2575 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,608 psi | 87% | 2700 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,114 psi | 85% | 2759 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,405 psi | 87% | 2667 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,304 psi | 87% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,145 psi | 88% | 2687 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 2694 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,985 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,304 psi | 57% | 2451 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,278 psi | 64% | 2589 fps | 97.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,972 psi | 89% | 2533 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,230 psi | 85% | 2661 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 56,898 psi | 88% | 2680 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,159 psi | 88% | 2651 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,579 psi | 87% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,522 psi | 88% | 2677 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,883 psi | 86% | 2723 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 55,506 psi | 85% | 2592 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,420 psi | 87% | 2618 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 58,146 psi | 89% | 2694 fps | 99.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2740 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 98% | 58,305 psi | 90% | 2703 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 88% | 56,072 psi | 86% | 2654 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,588 psi | 75% | 2582 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,376 psi | 85% | 2687 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 58,508 psi | 90% | 2779 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,433 psi | 55% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,537 psi | 89% | 2657 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,028 psi | 86% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,057 psi | 86% | 2628 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,159 psi | 86% | 2612 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 56,347 psi | 87% | 2510 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,606 psi | 82% | 2625 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,608 psi | 86% | 2631 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,358 psi | 79% | 2635 fps | 99.4% |
| IMR 4895 | <<locked>> | 92% | 58,595 psi | 90% | 2717 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 58,073 psi | 89% | 2644 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 58,595 psi | 90% | 2635 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,216 psi | 85% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,405 psi | 85% | 2579 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,724 psi | 86% | 2625 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 2674 fps | 99.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2657 fps | 98.1% |
| Norma 201 | <<locked>> | 90% | 57,885 psi | 89% | 2641 fps | 100% |
| Norma 202 | <<locked>> | 90% | 58,363 psi | 90% | 2641 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,289 psi | 87% | 2677 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,244 psi | 83% | 2667 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 53,359 psi | 82% | 2680 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 56,869 psi | 87% | 2700 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,141 psi | 80% | 2674 fps | 98.2% |
| Ramshot TAC | <<locked>> | 88% | 58,755 psi | 90% | 2671 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 58,160 psi | 89% | 2687 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,550 psi | 85% | 2605 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 55% | 1617 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,769 psi | 89% | 2628 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 58,378 psi | 90% | 2677 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,696 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,058 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2713 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,882 psi | 83% | 2740 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 55,419 psi | 85% | 2575 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 58,204 psi | 90% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,753 psi | 87% | 2671 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,159 psi | 88% | 2651 fps | 97.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 58,291 psi | 90% | 2674 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,216 psi | 85% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,724 psi | 86% | 2625 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2657 fps | 98.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,392 psi | 88% | 2602 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 58,537 psi | 90% | 2730 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,232 psi | 88% | 2572 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,927 psi | 88% | 2648 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,580 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,072 psi | 86% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,985 psi | 86% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,230 psi | 85% | 2582 fps | 97.7% |
| Somchem S321 | <<locked>> | 84% | 55,912 psi | 86% | 2635 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 58,798 psi | 90% | 2579 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,463 psi | 87% | 2641 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 57,043 psi | 88% | 2667 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,630 psi | 73% | 2631 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,767 psi | 86% | 2500 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,217 psi | 86% | 2523 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,928 psi | 89% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,332 psi | 85% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 58,740 psi | 90% | 2648 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2677 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 55,100 psi | 85% | 2598 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,014 psi | 88% | 2621 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2680 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,292 psi | 62% | 2516 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,681 psi | 87% | 2661 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 58,581 psi | 90% | 2694 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,595 psi | 89% | 2746 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,214 psi | 51% | 2438 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,566 psi | 89% | 2677 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% | 47,065 psi | 72% | 2421 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,401 psi | 79% | 2530 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,798 psi | 61% | 2359 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,615 psi | 72% | 2493 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,848 psi | 74% | 2470 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 37,652 psi | 58% | 2352 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,446 psi | 51% | 2329 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 55,317 psi | 85% | 2490 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 43,352 psi | 67% | 2454 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 36,956 psi | 57% | 2316 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,397 psi | 70% | 2461 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 45,484 psi | 70% | 2448 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,055 psi | 82% | 2648 fps | 100% |
| Alliant Power Pro 2000-MR | 55.8 gr | 80% | 39,175 psi | 60% | 2477 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,318 psi | 56% | 2333 fps | 98.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,823 psi | 81% | 2507 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,102 psi | 60% | 2395 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,156 psi | 53% | 2343 fps | 95.5% |
| Alliant Reloder-17 | 55 gr | 80% | 31,401 psi | 48% | 2303 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,356 psi | 45% | 2251 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,984 psi | 55% | 2470 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,491 psi | 84% | 2493 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,409 psi | 65% | 2457 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 35,969 psi | 55% | 2339 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 44,759 psi | 69% | 2457 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,195 psi | 73% | 2451 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,005 psi | 68% | 2480 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,457 psi | 75% | 2612 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 51,808 psi | 80% | 2546 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,779 psi | 81% | 2572 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,738 psi | 57% | 2339 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 92% | 43,976 psi | 68% | 2530 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 48,138 psi | 74% | 2552 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,700 psi | 67% | 2464 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,298 psi | 45% | 2198 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,523 psi | 61% | 2434 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 94% | 47,369 psi | 73% | 2608 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 41% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,901 psi | 64% | 2418 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 43,221 psi | 66% | 2457 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,798 psi | 60% | 2349 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,801 psi | 67% | 2415 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 53,098 psi | 82% | 2470 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 47,413 psi | 73% | 2526 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,830 psi | 67% | 2441 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 32,619 psi | 50% | 2293 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,016 psi | 62% | 2421 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 45,397 psi | 70% | 2461 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 51,213 psi | 79% | 2539 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,337 psi | 65% | 2434 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,584 psi | 67% | 2398 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 38,638 psi | 59% | 2352 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 38,072 psi | 59% | 2343 fps | 95.3% |
| Lovex S070 | <<locked>> | 92% | 43,424 psi | 67% | 2464 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,583 psi | 66% | 2411 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 42,612 psi | 66% | 2418 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,464 psi | 59% | 2382 fps | 98.2% |
| Norma 204 | <<locked>> | 98% | 50,836 psi | 78% | 2618 fps | 95% |
| Norma URP | <<locked>> | 86% | 33,982 psi | 52% | 2329 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 37,840 psi | 58% | 2392 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 40,321 psi | 62% | 2467 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,237 psi | 70% | 2467 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,672 psi | 69% | 2487 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,878 psi | 75% | 2503 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 41% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,792 psi | 78% | 2536 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,380 psi | 65% | 2425 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,843 psi | 63% | 2487 fps | 98.2% |
| ReloadSwiss RS 60 | 55 gr | 80% | 33,431 psi | 51% | 2365 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,679 psi | 55% | 2398 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,464 psi | 59% | 2457 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,470 psi | 71% | 2448 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,408 psi | 62% | 2365 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,765 psi | 52% | 2287 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 44,759 psi | 69% | 2457 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,072 psi | 59% | 2343 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,337 psi | 65% | 2434 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,638 psi | 59% | 2352 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 43,424 psi | 67% | 2464 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,650 psi | 83% | 2552 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,708 psi | 53% | 2333 fps | 97% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,911 psi | 83% | 2530 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,410 psi | 67% | 2441 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,800 psi | 64% | 2425 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,019 psi | 68% | 2369 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,535 psi | 56% | 2247 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,627 psi | 66% | 2388 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,979 psi | 75% | 2536 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,569 psi | 67% | 2372 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,192 psi | 66% | 2441 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 34,809 psi | 54% | 2297 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 26,774 psi | 41% | 2185 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 49,705 psi | 76% | 2425 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,309 psi | 68% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,900 psi | 61% | 2352 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,379 psi | 62% | 2359 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,924 psi | 51% | 2234 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 33,344 psi | 51% | 2283 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,484 psi | 70% | 2457 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 38,812 psi | 60% | 2349 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,012 psi | 54% | 2339 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 92% | 31,270 psi | 48% | 2320 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,327 psi | 45% | 2165 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 45,020 psi | 69% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 44,208 psi | 68% | 2536 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,269 psi | 45% | 2316 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,307 psi | 64% | 2431 fps | 99.1% |
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 | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,785 fps; across all powders the maximum-charge window runs from 1,581 fps to 2,785 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 51–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:16.5 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, Alliant Reloder-17 rank at the top here: for .338 Weatherby RPM with the .338 | 225gr | Swift A-Frame 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.