Load Specifications
Bullet:.338 | 230gr | Norma FMJ
Bullet Manufacturer:Norma
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:1:6.0
Load data in caliber .338 Weatherby RPM with .338 | 230gr | Norma FMJ bullet and 105 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 60 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% | 57,856 psi | 89% | 2536 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,115 psi | 86% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,333 psi | 87% | 2559 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 58,305 psi | 90% | 2625 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,506 psi | 85% | 2562 fps | 97.3% |
| Accurate 4064 | <<locked>> | 92% | 55,956 psi | 86% | 2602 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,651 psi | 86% | 2684 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 88% | 56,608 psi | 87% | 2635 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 57,725 psi | 89% | 2635 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,695 psi | 86% | 2589 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,681 psi | 87% | 2562 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,841 psi | 89% | 2687 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,333 psi | 87% | 2749 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,638 psi | 89% | 2654 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,159 psi | 88% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 58,349 psi | 90% | 2677 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,505 psi | 82% | 2687 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 58,610 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,189 psi | 59% | 2448 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,308 psi | 65% | 2589 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,391 psi | 87% | 2651 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 58,204 psi | 90% | 2667 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 58,291 psi | 90% | 2641 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,624 psi | 89% | 2572 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 58,755 psi | 90% | 2667 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 57,188 psi | 88% | 2713 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,362 psi | 87% | 2575 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 57,580 psi | 89% | 2605 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,753 psi | 86% | 2638 fps | 99.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 58,610 psi | 90% | 2733 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 96% | 55,912 psi | 86% | 2648 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 88% | 57,232 psi | 88% | 2641 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2572 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,637 psi | 87% | 2677 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,753 psi | 86% | 2720 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 54% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 58,668 psi | 90% | 2648 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 57,305 psi | 88% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,188 psi | 88% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,203 psi | 88% | 2602 fps | 98.3% |
| IMR 4198 | <<locked>> | 82% | 57,159 psi | 88% | 2490 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2621 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,710 psi | 87% | 2625 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 2628 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 56,043 psi | 86% | 2654 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,695 psi | 86% | 2589 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,956 psi | 86% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,478 psi | 87% | 2612 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,405 psi | 87% | 2566 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 56,884 psi | 88% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,970 psi | 86% | 2618 fps | 99.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 2651 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 55,492 psi | 85% | 2582 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,014 psi | 86% | 2582 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,508 psi | 88% | 2664 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 2667 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 54,665 psi | 84% | 2671 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 92% | 58,131 psi | 89% | 2690 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,563 psi | 82% | 2674 fps | 98.7% |
| Ramshot TAC | <<locked>> | 86% | 55,927 psi | 86% | 2608 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,579 psi | 86% | 2625 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,608 psi | 87% | 2592 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 55% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,114 psi | 85% | 2566 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,043 psi | 86% | 2621 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,085 psi | 85% | 2690 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 58,349 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,288 psi | 85% | 2707 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 2733 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 86% | 56,492 psi | 87% | 2562 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,883 psi | 86% | 2579 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 58,059 psi | 89% | 2661 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 58,291 psi | 90% | 2641 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,970 psi | 86% | 2618 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,478 psi | 87% | 2612 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,884 psi | 88% | 2612 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 2651 fps | 98.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 58,508 psi | 90% | 2592 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,231 psi | 87% | 2674 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 58,378 psi | 90% | 2559 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 58,102 psi | 89% | 2638 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 58,740 psi | 90% | 2657 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,130 psi | 88% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,072 psi | 88% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,333 psi | 87% | 2575 fps | 98.2% |
| Somchem S321 | <<locked>> | 84% | 57,058 psi | 88% | 2621 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,420 psi | 87% | 2523 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,638 psi | 89% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 58,262 psi | 90% | 2657 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,124 psi | 76% | 2628 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 56,840 psi | 87% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,290 psi | 88% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,521 psi | 85% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,478 psi | 87% | 2562 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,333 psi | 87% | 2592 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 57,319 psi | 88% | 2667 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 56,188 psi | 86% | 2589 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 58,175 psi | 89% | 2605 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2674 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,524 psi | 64% | 2516 fps | 98.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,812 psi | 89% | 2651 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,217 psi | 86% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,303 psi | 85% | 2687 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,171 psi | 53% | 2444 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 58,784 psi | 90% | 2667 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% | 48,051 psi | 74% | 2411 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,533 psi | 81% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,640 psi | 63% | 2346 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,529 psi | 73% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,701 psi | 70% | 2415 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,435 psi | 59% | 2339 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,111 psi | 49% | 2274 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 44,280 psi | 68% | 2448 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,579 psi | 58% | 2306 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,311 psi | 71% | 2451 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,630 psi | 72% | 2438 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 54,244 psi | 83% | 2638 fps | 100% |
| Alliant Power Pro 2000-MR | 56 gr | 80% | 40,074 psi | 62% | 2474 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,188 psi | 57% | 2329 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,896 psi | 83% | 2493 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,972 psi | 61% | 2385 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,837 psi | 51% | 2290 fps | 95.3% |
| Alliant Reloder-17 | 55.1 gr | 80% | 31,966 psi | 49% | 2297 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,878 psi | 46% | 2247 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,476 psi | 53% | 2415 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,366 psi | 67% | 2451 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 36,709 psi | 56% | 2333 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 45,701 psi | 70% | 2451 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,095 psi | 74% | 2441 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,976 psi | 69% | 2470 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,647 psi | 76% | 2605 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,866 psi | 81% | 2533 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,896 psi | 83% | 2559 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,608 psi | 58% | 2336 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 90% | 42,322 psi | 65% | 2477 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 49,197 psi | 76% | 2546 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 44,657 psi | 69% | 2454 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,166 psi | 43% | 2146 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,509 psi | 62% | 2431 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 45,049 psi | 69% | 2546 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 41% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,772 psi | 66% | 2408 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 44,280 psi | 68% | 2448 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,421 psi | 61% | 2336 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,003 psi | 65% | 2356 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 53,853 psi | 83% | 2451 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 45,527 psi | 70% | 2474 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,872 psi | 64% | 2382 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 33,359 psi | 51% | 2287 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 40,959 psi | 63% | 2415 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 46,311 psi | 71% | 2451 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 52,344 psi | 81% | 2526 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,337 psi | 67% | 2428 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,222 psi | 68% | 2385 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,320 psi | 60% | 2343 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 36,637 psi | 56% | 2290 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 41,771 psi | 64% | 2411 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,279 psi | 67% | 2398 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 43,569 psi | 67% | 2405 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,363 psi | 61% | 2375 fps | 98.6% |
| Norma 204 | <<locked>> | 98% | 51,982 psi | 80% | 2612 fps | 95.6% |
| Norma URP | <<locked>> | 84% | 32,663 psi | 50% | 2280 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,769 psi | 60% | 2388 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 38,783 psi | 60% | 2415 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,151 psi | 71% | 2457 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,658 psi | 70% | 2477 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,792 psi | 77% | 2497 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 41% | 1430 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,779 psi | 80% | 2523 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,712 psi | 63% | 2372 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,930 psi | 65% | 2480 fps | 98.6% |
| ReloadSwiss RS 60 | 55.1 gr | 80% | 34,026 psi | 52% | 2359 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,171 psi | 53% | 2343 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,811 psi | 57% | 2402 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 47,253 psi | 73% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,307 psi | 64% | 2359 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,635 psi | 53% | 2283 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 45,701 psi | 70% | 2451 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,637 psi | 56% | 2290 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,337 psi | 67% | 2428 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,320 psi | 60% | 2343 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 41,771 psi | 64% | 2411 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 54,694 psi | 84% | 2543 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,563 psi | 55% | 2326 fps | 97.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,737 psi | 84% | 2513 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,396 psi | 68% | 2434 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,670 psi | 66% | 2418 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,701 psi | 69% | 2356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,159 psi | 57% | 2234 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,598 psi | 67% | 2382 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 49,995 psi | 77% | 2526 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,251 psi | 68% | 2356 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,179 psi | 68% | 2434 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,462 psi | 55% | 2287 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 25,773 psi | 40% | 2133 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 50,444 psi | 78% | 2408 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,020 psi | 69% | 2349 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,669 psi | 63% | 2339 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,263 psi | 63% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,707 psi | 52% | 2231 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 34,127 psi | 53% | 2280 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 46,224 psi | 71% | 2444 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,682 psi | 61% | 2339 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,562 psi | 52% | 2283 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 30,124 psi | 46% | 2270 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,950 psi | 46% | 2162 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 45,847 psi | 71% | 2487 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 42,482 psi | 65% | 2480 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,253 psi | 43% | 2267 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,047 psi | 65% | 2421 fps | 99.4% |
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 105 powders for .338 Weatherby RPM loaded with the .338 | 230gr | Norma FMJ. Alliant Reloder-17 delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,562 fps to 2,776 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 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 230.0 gr projectile in 0.338" calls for a 1:6.0 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .338 Weatherby RPM with the .338 | 230gr | Norma FMJ 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.