Load Specifications
Bullet Manufacturer:Barnes
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 | Barnes TAC-TX BT 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% | 56,855 psi | 87% | 2520 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,203 psi | 88% | 2618 fps | 99.6% |
| Accurate 2230 | <<locked>> | 82% | 58,450 psi | 90% | 2631 fps | 99.8% |
| Accurate 2460 | <<locked>> | 86% | 55,347 psi | 85% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,725 psi | 89% | 2579 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,101 psi | 88% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,114 psi | 85% | 2533 fps | 96.1% |
| Accurate 4064 | <<locked>> | 98% | 57,101 psi | 88% | 2618 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,093 psi | 71% | 2539 fps | 98.1% |
| Accurate LT-30 | <<locked>> | 84% | 57,058 psi | 88% | 2474 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,508 psi | 88% | 2500 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,941 psi | 86% | 2615 fps | 99.8% |
| ADI AR 2207 | <<locked>> | 82% | 58,407 psi | 90% | 2480 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 57,072 psi | 88% | 2608 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 84% | 57,740 psi | 89% | 2589 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,245 psi | 85% | 2572 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,245 psi | 85% | 2549 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 57,159 psi | 88% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,463 psi | 85% | 2720 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,086 psi | 86% | 2628 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,869 psi | 87% | 2526 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 57,145 psi | 88% | 2651 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,977 psi | 71% | 2546 fps | 98.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,084 psi | 82% | 2687 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,057 psi | 86% | 2477 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,999 psi | 86% | 2631 fps | 99.4% |
| Bofors RP3 | <<locked>> | 98% | 56,565 psi | 87% | 2641 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,027 psi | 83% | 2562 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,479 psi | 88% | 2556 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 57,928 psi | 89% | 2651 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,028 psi | 86% | 2690 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 86% | 56,202 psi | 86% | 2569 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,493 psi | 88% | 2598 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 58,233 psi | 90% | 2654 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,777 psi | 77% | 2589 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 92% | 56,420 psi | 87% | 2621 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,974 psi | 65% | 2438 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,303 psi | 85% | 2654 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,534 psi | 53% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 58,059 psi | 89% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 55,912 psi | 86% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,434 psi | 87% | 2595 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,159 psi | 88% | 2575 fps | 97.3% |
| IMR 4198 | <<locked>> | 86% | 57,377 psi | 88% | 2487 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,057 psi | 86% | 2592 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,077 psi | 68% | 2490 fps | 97.8% |
| IMR 4895 | <<locked>> | 96% | 58,624 psi | 90% | 2680 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 55,245 psi | 85% | 2572 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,419 psi | 85% | 2562 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,085 psi | 85% | 2592 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,115 psi | 86% | 2546 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 55,608 psi | 86% | 2589 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,445 psi | 79% | 2536 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,646 psi | 75% | 2513 fps | 96% |
| Norma 200 | <<locked>> | 82% | 56,376 psi | 87% | 2497 fps | 100% |
| Norma 201 | <<locked>> | 94% | 58,059 psi | 89% | 2608 fps | 100% |
| Norma 202 | <<locked>> | 94% | 58,639 psi | 90% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,231 psi | 87% | 2638 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 46,064 psi | 71% | 2536 fps | 98% |
| Ramshot Big Game | <<locked>> | 96% | 56,869 psi | 87% | 2664 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,498 psi | 70% | 2526 fps | 96% |
| Ramshot TAC | <<locked>> | 90% | 55,941 psi | 86% | 2592 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 92% | 58,682 psi | 90% | 2654 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,826 psi | 87% | 2579 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,853 psi | 54% | 1565 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,216 psi | 85% | 2559 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,361 psi | 85% | 2592 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,363 psi | 88% | 2713 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,768 psi | 87% | 2743 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,818 psi | 70% | 2559 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,007 psi | 72% | 2579 fps | 97.3% |
| Rottweil R 901 | <<locked>> | 90% | 55,463 psi | 85% | 2546 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 58,175 psi | 89% | 2598 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 2628 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,027 psi | 83% | 2562 fps | 96.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,445 psi | 79% | 2536 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,085 psi | 85% | 2592 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,608 psi | 86% | 2589 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,646 psi | 75% | 2513 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,897 psi | 84% | 2533 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,014 psi | 88% | 2238 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 58,030 psi | 89% | 2598 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 58,523 psi | 90% | 2694 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 58,102 psi | 89% | 2549 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,696 psi | 89% | 2618 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 57,972 psi | 89% | 2635 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,101 psi | 88% | 2513 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,507 psi | 87% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,909 psi | 80% | 2493 fps | 96.4% |
| Somchem S321 | <<locked>> | 88% | 56,594 psi | 87% | 2608 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,680 psi | 86% | 2510 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,246 psi | 88% | 2612 fps | 99.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,869 psi | 87% | 2631 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,872 psi | 63% | 2487 fps | 99.5% |
| Vihtavuori N120 | <<locked>> | 82% | 58,233 psi | 90% | 2434 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 56,681 psi | 87% | 2477 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 57,029 psi | 88% | 2497 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,624 psi | 89% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,608 psi | 86% | 2546 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,984 psi | 85% | 2569 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,805 psi | 75% | 2536 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 90% | 55,941 psi | 86% | 2572 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 57,145 psi | 88% | 2589 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,485 psi | 73% | 2539 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,922 psi | 77% | 2530 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 55,172 psi | 85% | 2615 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,053 psi | 77% | 2595 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 94% | 57,754 psi | 89% | 2644 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% | 41,684 psi | 64% | 2316 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,490 psi | 82% | 2566 fps | 99.3% |
| Accurate 2230 | <<locked>> | 80% | 54,360 psi | 84% | 2579 fps | 99.6% |
| Accurate 2460 | <<locked>> | 80% | 45,208 psi | 70% | 2411 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,649 psi | 52% | 2231 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,408 psi | 62% | 2369 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 51,692 psi | 80% | 2487 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 31,894 psi | 49% | 2218 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 34,505 psi | 53% | 2329 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 50,430 psi | 78% | 2392 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,836 psi | 78% | 2415 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,203 psi | 59% | 2326 fps | 97.5% |
| ADI AR 2207 | <<locked>> | 80% | 54,984 psi | 85% | 2441 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 34,766 psi | 53% | 2238 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 50,546 psi | 78% | 2497 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,277 psi | 62% | 2339 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 39,508 psi | 61% | 2339 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,731 psi | 72% | 2520 fps | 99.5% |
| Alliant Power Pro 2000-MR | 51.7 gr | 82% | 36,941 psi | 57% | 2388 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,459 psi | 48% | 2205 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,152 psi | 73% | 2402 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,084 psi | 52% | 2260 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 35,984 psi | 55% | 2349 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,096 psi | 48% | 2260 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,182 psi | 76% | 2388 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,130 psi | 57% | 2323 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 30,589 psi | 47% | 2201 fps | 96.2% |
| Bofors RP7 | <<locked>> | 98% | 50,604 psi | 78% | 2510 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,424 psi | 65% | 2339 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,319 psi | 59% | 2352 fps | 99% |
| Hodgdon CFE223 | 51.6 gr | 80% | 42,293 psi | 65% | 2474 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 46,209 psi | 71% | 2434 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,905 psi | 72% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,564 psi | 56% | 2306 fps | 95% |
| Hodgdon H414 | <<locked>> | 98% | 46,630 psi | 72% | 2539 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 38,464 psi | 59% | 2336 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,647 psi | 47% | 2201 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,403 psi | 53% | 2303 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,556 psi | 39% | 1362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,246 psi | 57% | 2297 fps | 97.7% |
| IMR 3031 | <<locked>> | 80% | 37,507 psi | 58% | 2339 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,084 psi | 52% | 2221 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,529 psi | 73% | 2434 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 48,037 psi | 74% | 2372 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,644 psi | 72% | 2451 fps | 95.1% |
| IMR 4831 | <<locked>> | 94% | 35,969 psi | 55% | 2339 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 34,853 psi | 54% | 2287 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 80% | 40,277 psi | 62% | 2339 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 45,034 psi | 69% | 2418 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 36,564 psi | 56% | 2310 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 38,986 psi | 60% | 2277 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 33,634 psi | 52% | 2224 fps | 97.5% |
| Lovex S065 | <<locked>> | 92% | 40,001 psi | 62% | 2349 fps | 95% |
| Lovex S070 | <<locked>> | 98% | 45,571 psi | 70% | 2464 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 53,127 psi | 82% | 2457 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,362 psi | 57% | 2287 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 37,434 psi | 58% | 2300 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,460 psi | 51% | 2251 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 35,549 psi | 55% | 2336 fps | 95.1% |
| Ramshot Big Game | 50.4 gr | 80% | 32,967 psi | 51% | 2257 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 98% | 42,714 psi | 66% | 2477 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 40,118 psi | 62% | 2336 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,363 psi | 61% | 2359 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,656 psi | 67% | 2382 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,918 psi | 40% | 1398 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,223 psi | 70% | 2418 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 45,469 psi | 70% | 2444 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,288 psi | 54% | 2346 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,008 psi | 45% | 2215 fps | 96.9% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,333 psi | 57% | 2402 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,089 psi | 63% | 2467 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 41,089 psi | 63% | 2333 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,462 psi | 55% | 2241 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 28,805 psi | 44% | 2149 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 98% | 50,604 psi | 78% | 2510 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,001 psi | 62% | 2349 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,564 psi | 56% | 2310 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 33,634 psi | 52% | 2224 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 98% | 45,571 psi | 70% | 2464 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,950 psi | 74% | 2434 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,056 psi | 83% | 2201 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,865 psi | 78% | 2507 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,300 psi | 50% | 2247 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,051 psi | 74% | 2421 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,058 psi | 59% | 2310 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,869 psi | 57% | 2300 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,073 psi | 60% | 2254 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,010 psi | 49% | 2133 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,443 psi | 75% | 2444 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 43,120 psi | 66% | 2411 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 38,609 psi | 59% | 2260 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,797 psi | 58% | 2310 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 30,037 psi | 46% | 2162 fps | 95.3% |
| Somchem S365 | <<locked>> | 88% | 27,847 psi | 43% | 2188 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 54,882 psi | 84% | 2395 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 44,396 psi | 68% | 2320 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,276 psi | 60% | 2257 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,432 psi | 53% | 2234 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,462 psi | 55% | 2244 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 28,442 psi | 44% | 2110 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 37,405 psi | 58% | 2343 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 40,118 psi | 62% | 2336 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 34,113 psi | 52% | 2231 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 36,506 psi | 56% | 2343 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,169 psi | 48% | 2178 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 39,146 psi | 60% | 2372 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 46,630 psi | 72% | 2539 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,926 psi | 55% | 2300 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 | Barnes TAC-TX BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,743 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 | Barnes TAC-TX BT 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.