Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:230 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:1:14.5
Load data in caliber .338 Weatherby RPM with .338 | 230gr | Nosler CT FailSafe 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% | 55,550 psi | 85% | 2493 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,435 psi | 88% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,985 psi | 88% | 2552 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,492 psi | 85% | 2572 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,884 psi | 88% | 2559 fps | 97.2% |
| Accurate 4064 | <<locked>> | 94% | 56,695 psi | 87% | 2595 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,547 psi | 81% | 2625 fps | 99.4% |
| Accurate LT-30 | <<locked>> | 82% | 57,696 psi | 89% | 2474 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 58,131 psi | 89% | 2503 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 57,827 psi | 89% | 2631 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 58,653 psi | 90% | 2625 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,087 psi | 88% | 2585 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 57,740 psi | 89% | 2559 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,390 psi | 85% | 2635 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,334 psi | 88% | 2743 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 58,508 psi | 90% | 2648 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 58,653 psi | 90% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,782 psi | 86% | 2625 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,140 psi | 79% | 2631 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,390 psi | 85% | 2713 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,187 psi | 56% | 2385 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,001 psi | 62% | 2520 fps | 96.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,869 psi | 87% | 2477 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,682 psi | 89% | 2648 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 55,608 psi | 86% | 2618 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,883 psi | 86% | 2585 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 88% | 58,798 psi | 90% | 2566 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,246 psi | 87% | 2618 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 58,378 psi | 90% | 2710 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 57,856 psi | 89% | 2575 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,100 psi | 85% | 2559 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,739 psi | 87% | 2628 fps | 99.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2671 fps | 98% |
| Hodgdon H4350 | <<locked>> | 98% | 56,826 psi | 87% | 2638 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 90% | 58,363 psi | 90% | 2638 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,079 psi | 72% | 2516 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,450 psi | 88% | 2671 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 56,913 psi | 88% | 2710 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 54% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,101 psi | 86% | 2595 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 58,189 psi | 90% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 58,305 psi | 90% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 58,581 psi | 90% | 2595 fps | 98.2% |
| IMR 4198 | <<locked>> | 84% | 58,552 psi | 90% | 2490 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,286 psi | 80% | 2559 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,870 psi | 89% | 2618 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,864 psi | 77% | 2572 fps | 99.2% |
| IMR 4895 | <<locked>> | 92% | 57,188 psi | 88% | 2651 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,087 psi | 88% | 2585 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,348 psi | 88% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,406 psi | 88% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,609 psi | 89% | 2562 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 57,812 psi | 89% | 2605 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 2608 fps | 99% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,215 psi | 83% | 2592 fps | 97.8% |
| Norma 201 | <<locked>> | 90% | 56,579 psi | 87% | 2579 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,058 psi | 88% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 94% | 58,305 psi | 90% | 2657 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 51,837 psi | 80% | 2615 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 92% | 55,201 psi | 85% | 2635 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,720 psi | 78% | 2608 fps | 97.9% |
| Ramshot TAC | <<locked>> | 88% | 57,464 psi | 88% | 2608 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,695 psi | 87% | 2621 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,957 psi | 89% | 2589 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,781 psi | 55% | 1581 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,623 psi | 87% | 2569 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,159 psi | 88% | 2615 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,202 psi | 86% | 2687 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,288 psi | 85% | 2713 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,069 psi | 80% | 2644 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,402 psi | 81% | 2671 fps | 99% |
| Rottweil R 901 | <<locked>> | 88% | 57,609 psi | 89% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,956 psi | 88% | 2575 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,187 psi | 85% | 2608 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,883 psi | 86% | 2585 fps | 97.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,782 psi | 87% | 2608 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,406 psi | 88% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 57,812 psi | 89% | 2605 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,215 psi | 83% | 2592 fps | 97.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,101 psi | 86% | 2539 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,956 psi | 88% | 2664 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,101 psi | 86% | 2513 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,738 psi | 86% | 2589 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,289 psi | 87% | 2608 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 58,305 psi | 90% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 58,262 psi | 90% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2566 fps | 98% |
| Somchem S321 | <<locked>> | 86% | 58,334 psi | 90% | 2618 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,551 psi | 89% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,274 psi | 85% | 2579 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 55,811 psi | 86% | 2605 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,195 psi | 71% | 2569 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 58,247 psi | 90% | 2484 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 58,363 psi | 90% | 2503 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,434 psi | 87% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,421 psi | 88% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,363 psi | 88% | 2589 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 2612 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 88% | 57,725 psi | 89% | 2585 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,535 psi | 85% | 2559 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 2618 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,131 psi | 60% | 2457 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,216 psi | 85% | 2598 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,130 psi | 88% | 2628 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2674 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,271 psi | 50% | 2369 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,057 psi | 86% | 2615 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% | 46,006 psi | 71% | 2365 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,183 psi | 77% | 2470 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,638 psi | 59% | 2300 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,498 psi | 70% | 2434 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,673 psi | 72% | 2408 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 36,521 psi | 56% | 2293 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,460 psi | 50% | 2270 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 54,346 psi | 84% | 2434 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 54,766 psi | 84% | 2461 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,308 psi | 65% | 2392 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,187 psi | 56% | 2260 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,382 psi | 68% | 2402 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,338 psi | 68% | 2392 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,793 psi | 80% | 2585 fps | 100% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 38,276 psi | 59% | 2415 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,505 psi | 55% | 2280 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,924 psi | 80% | 2451 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,116 psi | 59% | 2336 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,344 psi | 51% | 2283 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,632 psi | 47% | 2244 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,240 psi | 47% | 2238 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,246 psi | 57% | 2461 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,519 psi | 82% | 2438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,481 psi | 64% | 2398 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 35,012 psi | 54% | 2280 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 46,470 psi | 71% | 2444 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,383 psi | 71% | 2395 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,902 psi | 66% | 2421 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,311 psi | 73% | 2552 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 50,850 psi | 78% | 2487 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,692 psi | 80% | 2513 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,868 psi | 55% | 2280 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 42,931 psi | 66% | 2470 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 94% | 50,154 psi | 77% | 2539 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 42,699 psi | 66% | 2405 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,601 psi | 44% | 2142 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,638 psi | 59% | 2379 fps | 99% |
| Hodgdon Superformance | <<locked>> | 94% | 45,963 psi | 71% | 2539 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 40% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,147 psi | 63% | 2362 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 42,134 psi | 65% | 2398 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,956 psi | 58% | 2290 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,047 psi | 66% | 2356 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 52,011 psi | 80% | 2411 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,441 psi | 71% | 2467 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,368 psi | 70% | 2428 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 33,779 psi | 52% | 2283 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,030 psi | 60% | 2362 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,382 psi | 68% | 2402 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,082 psi | 77% | 2480 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,307 psi | 64% | 2379 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,786 psi | 66% | 2339 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 37,797 psi | 58% | 2297 fps | 99% |
| Lovex S065 | <<locked>> | 88% | 39,624 psi | 61% | 2333 fps | 95.7% |
| Lovex S070 | <<locked>> | 92% | 42,308 psi | 65% | 2402 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 41,481 psi | 64% | 2352 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 41,742 psi | 64% | 2362 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,507 psi | 58% | 2326 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 35,389 psi | 54% | 2326 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 36,927 psi | 57% | 2336 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 39,204 psi | 60% | 2405 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 44,338 psi | 68% | 2408 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,700 psi | 67% | 2428 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,863 psi | 74% | 2448 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 41% | 1411 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,777 psi | 77% | 2477 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,524 psi | 64% | 2369 fps | 95.4% |
| ReloadSwiss RS 52 | 51.9 gr | 80% | 39,784 psi | 61% | 2428 fps | 98% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 32,590 psi | 50% | 2306 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,650 psi | 53% | 2336 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,492 psi | 58% | 2395 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 45,469 psi | 70% | 2388 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,508 psi | 61% | 2310 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,953 psi | 51% | 2231 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 46,470 psi | 71% | 2444 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,624 psi | 61% | 2333 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,307 psi | 64% | 2379 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,797 psi | 58% | 2297 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 42,308 psi | 65% | 2402 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,547 psi | 81% | 2493 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,939 psi | 52% | 2277 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,721 psi | 81% | 2470 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,453 psi | 65% | 2382 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,930 psi | 63% | 2369 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,047 psi | 66% | 2313 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,636 psi | 55% | 2192 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,353 psi | 68% | 2375 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 47,964 psi | 74% | 2477 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,511 psi | 65% | 2313 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,235 psi | 65% | 2382 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 33,823 psi | 52% | 2238 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 26,107 psi | 40% | 2129 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,631 psi | 75% | 2365 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,294 psi | 67% | 2306 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,870 psi | 60% | 2297 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,552 psi | 61% | 2303 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,184 psi | 50% | 2182 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 34,693 psi | 53% | 2277 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,483 psi | 68% | 2398 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 37,971 psi | 58% | 2293 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,011 psi | 52% | 2280 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 32,285 psi | 50% | 2310 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,689 psi | 44% | 2113 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 43,888 psi | 68% | 2441 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 42,931 psi | 66% | 2470 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,298 psi | 47% | 2310 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,263 psi | 62% | 2372 fps | 98.9% |
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 | 230gr | Nosler CT FailSafe. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,743 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 230.0 gr projectile in 0.338" calls for a 1:14.5 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 | 230gr | Nosler CT FailSafe 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.