Load Specifications
Bullet Manufacturer:TWENTY-NINE
Bullet Weight:224 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:1:11.5
Load data in caliber .338 Weatherby RPM with .338 | 224gr | TWENTY-NINE ERTP 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 52 and Hodgdon LEVERevolution.
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% | 58,030 psi | 89% | 2533 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 58,088 psi | 89% | 2631 fps | 99.6% |
| Accurate 2460 | <<locked>> | 86% | 56,637 psi | 87% | 2566 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,651 psi | 86% | 2552 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 58,349 psi | 90% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,188 psi | 86% | 2549 fps | 96.2% |
| Accurate 4064 | <<locked>> | 98% | 58,798 psi | 90% | 2635 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,094 psi | 72% | 2556 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 84% | 57,537 psi | 89% | 2480 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,957 psi | 89% | 2507 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 57,014 psi | 88% | 2628 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 98% | 57,682 psi | 89% | 2618 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 84% | 58,726 psi | 90% | 2598 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,202 psi | 86% | 2582 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 56,333 psi | 87% | 2562 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 58,233 psi | 90% | 2684 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 56,420 psi | 87% | 2733 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 57,188 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 58,001 psi | 89% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 58,204 psi | 90% | 2664 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,891 psi | 72% | 2562 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,041 psi | 83% | 2700 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,594 psi | 87% | 2484 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,637 psi | 87% | 2641 fps | 99.4% |
| Bofors RP3 | <<locked>> | 98% | 57,870 psi | 89% | 2657 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 2572 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 90% | 58,407 psi | 90% | 2569 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 58,798 psi | 90% | 2661 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 57,000 psi | 88% | 2703 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 57,101 psi | 88% | 2582 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 58,189 psi | 90% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,593 psi | 86% | 2621 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 50,807 psi | 78% | 2605 fps | 96.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 55,724 psi | 86% | 2621 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 92% | 57,508 psi | 88% | 2638 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,004 psi | 66% | 2454 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 56,347 psi | 87% | 2667 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 54% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,332 psi | 85% | 2592 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 56,971 psi | 88% | 2621 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 57,377 psi | 88% | 2605 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 58,073 psi | 89% | 2589 fps | 97.4% |
| IMR 4198 | <<locked>> | 86% | 58,146 psi | 89% | 2497 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,971 psi | 88% | 2605 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,947 psi | 69% | 2503 fps | 97.9% |
| IMR 4895 | <<locked>> | 94% | 56,014 psi | 86% | 2644 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 56,202 psi | 86% | 2582 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 56,739 psi | 87% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 56,347 psi | 87% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 57,029 psi | 88% | 2559 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 56,768 psi | 87% | 2602 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,286 psi | 80% | 2549 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2530 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 57,711 psi | 89% | 2510 fps | 100% |
| Norma 201 | <<locked>> | 92% | 55,622 psi | 86% | 2575 fps | 100% |
| Norma 202 | <<locked>> | 92% | 56,057 psi | 86% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 96% | 57,290 psi | 88% | 2651 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 47,123 psi | 72% | 2552 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 96% | 57,914 psi | 89% | 2680 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,514 psi | 72% | 2543 fps | 96.2% |
| Ramshot TAC | <<locked>> | 90% | 56,884 psi | 88% | 2605 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,043 psi | 86% | 2621 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 57,522 psi | 88% | 2589 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,172 psi | 54% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,898 psi | 86% | 2569 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 56,115 psi | 86% | 2602 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 58,450 psi | 90% | 2726 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 2756 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,949 psi | 72% | 2575 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,950 psi | 74% | 2595 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 90% | 56,927 psi | 88% | 2562 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,072 psi | 86% | 2572 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 57,392 psi | 88% | 2644 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 2572 fps | 96.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,286 psi | 80% | 2549 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 56,347 psi | 87% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,768 psi | 87% | 2602 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2530 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,883 psi | 86% | 2543 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,769 psi | 89% | 2244 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,201 psi | 85% | 2566 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,550 psi | 85% | 2654 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,579 psi | 86% | 2520 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,926 psi | 85% | 2579 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,361 psi | 85% | 2602 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,783 psi | 89% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 57,435 psi | 88% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,040 psi | 82% | 2510 fps | 96.5% |
| Somchem S321 | <<locked>> | 88% | 57,711 psi | 89% | 2621 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,782 psi | 87% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,928 psi | 89% | 2618 fps | 99.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,740 psi | 89% | 2641 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,901 psi | 64% | 2503 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 88% | 57,653 psi | 89% | 2490 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 57,682 psi | 89% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 58,784 psi | 90% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,666 psi | 87% | 2559 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,086 psi | 86% | 2579 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,574 psi | 76% | 2549 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 90% | 56,971 psi | 88% | 2585 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 58,218 psi | 90% | 2602 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,588 psi | 75% | 2556 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,099 psi | 54% | 2382 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,604 psi | 78% | 2536 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 56,188 psi | 86% | 2628 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,807 psi | 78% | 2605 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 94% | 58,769 psi | 90% | 2657 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% | 42,641 psi | 66% | 2329 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 54,447 psi | 84% | 2582 fps | 99.4% |
| Accurate 2460 | <<locked>> | 80% | 46,514 psi | 72% | 2428 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,317 psi | 54% | 2257 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,655 psi | 64% | 2388 fps | 99.9% |
| Accurate 2700 | <<locked>> | 92% | 52,692 psi | 81% | 2500 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 33,388 psi | 51% | 2244 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 35,810 psi | 55% | 2352 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 51,169 psi | 79% | 2402 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,561 psi | 79% | 2425 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,233 psi | 60% | 2343 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 33,417 psi | 51% | 2205 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 51,227 psi | 79% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,249 psi | 63% | 2356 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 40,582 psi | 62% | 2356 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,790 psi | 74% | 2533 fps | 99.5% |
| Alliant Power Pro 2000-MR | 50.4 gr | 80% | 35,346 psi | 54% | 2349 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,489 psi | 50% | 2224 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,240 psi | 74% | 2415 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,128 psi | 54% | 2280 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,898 psi | 57% | 2365 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,039 psi | 49% | 2283 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,009 psi | 77% | 2402 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,029 psi | 59% | 2339 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 31,836 psi | 49% | 2224 fps | 96.6% |
| Bofors RP7 | <<locked>> | 98% | 51,677 psi | 80% | 2526 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,308 psi | 67% | 2352 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,421 psi | 61% | 2372 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,279 psi | 67% | 2490 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 47,137 psi | 73% | 2448 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,601 psi | 73% | 2467 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 37,492 psi | 58% | 2323 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 98% | 47,659 psi | 73% | 2556 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 98% | 52,286 psi | 80% | 2572 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,508 psi | 61% | 2352 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,647 psi | 49% | 2224 fps | 95.5% |
| Hodgdon LEVERevolution | 49.4 gr | 80% | 35,331 psi | 54% | 2320 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,831 psi | 40% | 1365 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,145 psi | 59% | 2313 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 38,566 psi | 59% | 2356 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,027 psi | 54% | 2238 fps | 95.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,211 psi | 74% | 2444 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 48,834 psi | 75% | 2382 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,500 psi | 73% | 2464 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 34,766 psi | 53% | 2313 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 35,911 psi | 55% | 2310 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 41,249 psi | 63% | 2356 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 46,050 psi | 71% | 2431 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 37,565 psi | 58% | 2323 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 39,856 psi | 61% | 2290 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 34,751 psi | 53% | 2244 fps | 97.8% |
| Lovex S065 | <<locked>> | 92% | 41,104 psi | 63% | 2365 fps | 95.3% |
| Lovex S070 | <<locked>> | 98% | 46,717 psi | 72% | 2484 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 54,462 psi | 84% | 2474 fps | 100% |
| Norma 201 | <<locked>> | 80% | 38,537 psi | 59% | 2306 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 38,479 psi | 59% | 2316 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 34,490 psi | 53% | 2270 fps | 96.3% |
| Norma URP | <<locked>> | 92% | 36,550 psi | 56% | 2356 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 33,924 psi | 52% | 2277 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 98% | 43,468 psi | 67% | 2487 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 41,089 psi | 63% | 2352 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,118 psi | 62% | 2369 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,614 psi | 69% | 2398 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,049 psi | 40% | 1398 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,195 psi | 71% | 2431 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 43,424 psi | 67% | 2405 fps | 95% |
| ReloadSwiss RS 52 | 48.8 gr | 80% | 36,129 psi | 56% | 2362 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,979 psi | 46% | 2238 fps | 97.3% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,261 psi | 59% | 2418 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,003 psi | 65% | 2484 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 42,250 psi | 65% | 2349 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,651 psi | 56% | 2260 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 29,994 psi | 46% | 2175 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 98% | 51,677 psi | 80% | 2526 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 41,104 psi | 63% | 2365 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,565 psi | 58% | 2323 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 34,751 psi | 53% | 2244 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 98% | 46,717 psi | 72% | 2484 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,921 psi | 75% | 2448 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,795 psi | 84% | 2211 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,605 psi | 79% | 2516 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,272 psi | 51% | 2267 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,965 psi | 75% | 2434 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,972 psi | 60% | 2323 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,652 psi | 58% | 2313 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,045 psi | 62% | 2270 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,953 psi | 51% | 2149 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 46,296 psi | 71% | 2411 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 44,179 psi | 68% | 2428 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 39,653 psi | 61% | 2277 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,783 psi | 60% | 2326 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 31,140 psi | 48% | 2185 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 28,892 psi | 44% | 2211 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 45,382 psi | 70% | 2333 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,205 psi | 62% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,578 psi | 55% | 2254 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,477 psi | 56% | 2260 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 29,472 psi | 45% | 2129 fps | 96.6% |
| Vihtavuori N160 | <<locked>> | 90% | 36,013 psi | 55% | 2310 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 41,104 psi | 63% | 2349 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 34,954 psi | 54% | 2247 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 37,608 psi | 58% | 2362 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 98% | 32,880 psi | 51% | 2333 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,053 psi | 49% | 2198 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 40,147 psi | 62% | 2388 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 47,659 psi | 73% | 2556 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,927 psi | 57% | 2316 fps | 97.6% |
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 | 224gr | TWENTY-NINE ERTP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,756 fps; across all powders the maximum-charge window runs from 1,532 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 54–90 %, leaving at least 10 % headroom. The 224.0 gr projectile in 0.338" calls for a 1:11.5 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 52, Hodgdon LEVERevolution rank at the top here: for .338 Weatherby RPM with the .338 | 224gr | TWENTY-NINE ERTP 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.