Load Specifications
Load data in caliber .338 Weatherby RPM with .338 | 180gr | Impala LW CFN bullet and 91 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>> | 88% | 56,666 psi | 87% | 2835 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,448 psi | 85% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,709 psi | 86% | 2864 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,449 psi | 87% | 2913 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 58,320 psi | 90% | 2946 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,298 psi | 76% | 2881 fps | 97% |
| Accurate LT-30 | <<locked>> | 84% | 58,320 psi | 90% | 2812 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 58,726 psi | 90% | 2835 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 58,392 psi | 90% | 2963 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 96% | 55,535 psi | 85% | 2897 fps | 98.5% |
| ADI AR 2219 | <<locked>> | 82% | 55,927 psi | 86% | 2890 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 57,551 psi | 89% | 2917 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 90% | 57,435 psi | 88% | 2904 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,796 psi | 86% | 2976 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 57,377 psi | 88% | 3064 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 58,494 psi | 90% | 2976 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,188 psi | 86% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,014 psi | 86% | 2946 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,240 psi | 74% | 2874 fps | 96.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 3035 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,551 psi | 89% | 2808 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 57,667 psi | 89% | 2966 fps | 98.5% |
| Bofors RP3 | <<locked>> | 96% | 55,985 psi | 86% | 2946 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,130 psi | 86% | 2851 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,724 psi | 87% | 2949 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 88% | 57,957 psi | 89% | 3038 fps | 99% |
| Hodgdon H322 | <<locked>> | 86% | 58,015 psi | 89% | 2920 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,796 psi | 86% | 2897 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 57,116 psi | 88% | 2946 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 90% | 55,564 psi | 85% | 2927 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,541 psi | 69% | 2762 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,159 psi | 88% | 2999 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,331 psi | 54% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,420 psi | 87% | 2920 fps | 99.4% |
| IMR 3031 | <<locked>> | 92% | 58,001 psi | 89% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 58,552 psi | 90% | 2933 fps | 99% |
| IMR 4198 | <<locked>> | 86% | 58,711 psi | 90% | 2835 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,876 psi | 72% | 2818 fps | 96.6% |
| IMR 4895 | <<locked>> | 94% | 57,334 psi | 88% | 2979 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 90% | 57,551 psi | 89% | 2917 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 55,042 psi | 85% | 2861 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 58,030 psi | 89% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 58,073 psi | 89% | 2884 fps | 99.3% |
| Lovex S062 | <<locked>> | 96% | 58,436 psi | 90% | 2940 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,259 psi | 83% | 2871 fps | 96.5% |
| Norma 201 | <<locked>> | 92% | 57,769 psi | 89% | 2917 fps | 99.8% |
| Norma 202 | <<locked>> | 92% | 57,580 psi | 89% | 2920 fps | 100% |
| Norma 203B | <<locked>> | 96% | 58,421 psi | 90% | 2982 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 48,704 psi | 75% | 2867 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 96% | 58,769 psi | 90% | 3009 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 57,957 psi | 89% | 2923 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 90% | 57,188 psi | 88% | 2949 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,303 psi | 85% | 2864 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 55% | 1801 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,217 psi | 88% | 2904 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,537 psi | 89% | 2923 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,593 psi | 86% | 3009 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,332 psi | 85% | 3041 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,631 psi | 75% | 2890 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 88% | 56,202 psi | 86% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 58,146 psi | 89% | 2910 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 98% | 55,840 psi | 86% | 2933 fps | 99.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,259 psi | 83% | 2871 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 58,030 psi | 89% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 58,436 psi | 90% | 2940 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,174 psi | 88% | 2871 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 58,697 psi | 90% | 2562 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,579 psi | 87% | 2904 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,710 psi | 87% | 2986 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,362 psi | 87% | 2854 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,507 psi | 87% | 2904 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,565 psi | 87% | 2930 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,869 psi | 86% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 58,407 psi | 90% | 2844 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 55,463 psi | 85% | 2904 fps | 99.8% |
| Somchem S335 | <<locked>> | 92% | 58,581 psi | 90% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,535 psi | 85% | 2897 fps | 98.9% |
| Somchem S355 | <<locked>> | 98% | 56,217 psi | 86% | 2930 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,714 psi | 67% | 2818 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 86% | 55,753 psi | 86% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,550 psi | 85% | 2795 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,666 psi | 87% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,711 psi | 89% | 2890 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2910 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,981 psi | 78% | 2864 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 90% | 58,131 psi | 89% | 2917 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 94% | 56,144 psi | 86% | 2890 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,357 psi | 77% | 2871 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2851 fps | 99% |
| Winchester 748 | <<locked>> | 90% | 57,348 psi | 88% | 2966 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,217 psi | 86% | 2940 fps | 99.5% |
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% | 45,092 psi | 69% | 2654 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,979 psi | 75% | 2756 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 38,972 psi | 60% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,947 psi | 68% | 2707 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 36,753 psi | 57% | 2569 fps | 99% |
| Accurate 4350 | <<locked>> | 96% | 43,279 psi | 67% | 2769 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 51,851 psi | 80% | 2720 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,214 psi | 80% | 2740 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,176 psi | 63% | 2651 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 39,392 psi | 61% | 2598 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 52,460 psi | 81% | 2838 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,830 psi | 66% | 2664 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 42,206 psi | 65% | 2677 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,327 psi | 76% | 2864 fps | 98.7% |
| Alliant Power Pro 2000-MR | 59.5 gr | 84% | 41,872 psi | 64% | 2766 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,650 psi | 53% | 2526 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,140 psi | 77% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 39,407 psi | 61% | 2635 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 96% | 43,149 psi | 66% | 2769 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 38,334 psi | 59% | 2690 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,184 psi | 79% | 2717 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 42,293 psi | 65% | 2694 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 34,563 psi | 53% | 2533 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,802 psi | 69% | 2661 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,481 psi | 64% | 2687 fps | 98.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,643 psi | 69% | 2805 fps | 96.7% |
| Hodgdon H322 | <<locked>> | 80% | 48,240 psi | 74% | 2772 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,081 psi | 76% | 2792 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 44,904 psi | 69% | 2736 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,408 psi | 64% | 2664 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 37,681 psi | 58% | 2615 fps | 95.6% |
| Hodgdon LEVERevolution | 55.6 gr | 80% | 37,260 psi | 57% | 2625 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,537 psi | 61% | 2612 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 40,379 psi | 62% | 2677 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 39,059 psi | 60% | 2582 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 49,748 psi | 77% | 2707 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 41,510 psi | 64% | 2717 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,029 psi | 59% | 2618 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 42,830 psi | 66% | 2664 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 48,675 psi | 75% | 2759 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 40,103 psi | 62% | 2644 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 41,553 psi | 64% | 2595 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 37,202 psi | 57% | 2552 fps | 96.7% |
| Lovex S065 | <<locked>> | 96% | 48,501 psi | 75% | 2772 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 40,901 psi | 63% | 2618 fps | 97.6% |
| Norma 202 | <<locked>> | 80% | 40,495 psi | 62% | 2628 fps | 99.3% |
| Norma 203B | <<locked>> | 80% | 36,680 psi | 56% | 2575 fps | 95% |
| Norma URP | <<locked>> | 96% | 43,294 psi | 67% | 2762 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 82% | 38,029 psi | 59% | 2628 fps | 95% |
| Ramshot TAC | <<locked>> | 84% | 48,225 psi | 74% | 2762 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,814 psi | 64% | 2677 fps | 96.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,238 psi | 71% | 2707 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 41% | 1614 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,645 psi | 73% | 2749 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,099 psi | 83% | 2867 fps | 95.6% |
| ReloadSwiss RS 52 | 56.3 gr | 82% | 40,509 psi | 62% | 2726 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,024 psi | 49% | 2533 fps | 95.7% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 45,658 psi | 70% | 2835 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 45,136 psi | 69% | 2677 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 39,175 psi | 60% | 2572 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 82% | 34,577 psi | 53% | 2526 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 48,501 psi | 75% | 2772 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,103 psi | 62% | 2644 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 37,202 psi | 57% | 2552 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,386 psi | 78% | 2766 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 55,898 psi | 86% | 2526 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,011 psi | 82% | 2848 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 39,610 psi | 61% | 2671 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,183 psi | 77% | 2762 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 46,731 psi | 72% | 2740 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,465 psi | 61% | 2615 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,930 psi | 65% | 2579 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,838 psi | 54% | 2444 fps | 99.1% |
| Somchem S321 | <<locked>> | 80% | 46,180 psi | 71% | 2746 fps | 98.9% |
| Somchem S335 | <<locked>> | 80% | 41,698 psi | 64% | 2585 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 40,625 psi | 63% | 2631 fps | 96.1% |
| Somchem S355 | <<locked>> | 82% | 35,418 psi | 54% | 2533 fps | 95.1% |
| Somchem S365 | <<locked>> | 90% | 32,895 psi | 51% | 2556 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,065 psi | 72% | 2651 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,843 psi | 64% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,753 psi | 58% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,290 psi | 59% | 2562 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 80% | 31,691 psi | 49% | 2421 fps | 95.3% |
| Vihtavuori N160 | <<locked>> | 94% | 42,656 psi | 66% | 2707 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 42,902 psi | 66% | 2661 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 37,144 psi | 57% | 2552 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 96% | 44,469 psi | 68% | 2766 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,172 psi | 56% | 2533 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 41,829 psi | 64% | 2700 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,783 psi | 60% | 2618 fps | 96.3% |
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 91 powders for .338 Weatherby RPM loaded with the .338 | 180gr | Impala LW CFN. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,064 fps. Accurate 4350 gives the best case fill at 100 %, and 91 of the 91 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 180.0 gr projectile in 0.338" calls for a 1:15.5 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 | 180gr | Impala LW CFN 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.