Load Specifications
Bullet Manufacturer:Alaska Bullet Works
Bullet Weight:200 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:1:16.0
Load data in caliber .338 Weatherby RPM with .338 | 200gr | Alaska Bullet Works Kodiak SP SPBC bullet and 104 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 ReloadSwiss RS 60.
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% | 55,390 psi | 85% | 2697 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 57,667 psi | 89% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,797 psi | 87% | 2759 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,593 psi | 86% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 57,101 psi | 88% | 2749 fps | 95.9% |
| Accurate 4064 | <<locked>> | 96% | 56,420 psi | 87% | 2802 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,443 psi | 75% | 2759 fps | 98% |
| Accurate LT-30 | <<locked>> | 84% | 58,334 psi | 90% | 2687 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 58,784 psi | 90% | 2713 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 57,972 psi | 89% | 2838 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 55,405 psi | 85% | 2782 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 55,825 psi | 86% | 2762 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 57,232 psi | 88% | 2792 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 57,203 psi | 88% | 2769 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,288 psi | 85% | 2844 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 57,667 psi | 89% | 2949 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 58,276 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 58,581 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,564 psi | 85% | 2822 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,877 psi | 74% | 2762 fps | 98.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 2913 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,421 psi | 88% | 2684 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 57,827 psi | 89% | 2851 fps | 99.3% |
| Bofors RP3 | <<locked>> | 96% | 55,187 psi | 85% | 2815 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2779 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,869 psi | 86% | 2730 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,318 psi | 87% | 2822 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 58,247 psi | 90% | 2917 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 86% | 58,044 psi | 89% | 2792 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,434 psi | 85% | 2766 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,710 psi | 87% | 2828 fps | 98.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,895 psi | 80% | 2808 fps | 96% |
| Hodgdon H4895 | <<locked>> | 92% | 58,479 psi | 90% | 2848 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,874 psi | 67% | 2648 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 57,421 psi | 88% | 2877 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 54% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,333 psi | 87% | 2799 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 58,044 psi | 89% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 58,421 psi | 90% | 2815 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,506 psi | 85% | 2743 fps | 96.5% |
| IMR 4198 | <<locked>> | 84% | 55,521 psi | 85% | 2661 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 58,030 psi | 89% | 2812 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2703 fps | 97.7% |
| IMR 4895 | <<locked>> | 94% | 56,942 psi | 88% | 2851 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 57,232 psi | 88% | 2792 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 57,638 psi | 89% | 2782 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 57,479 psi | 88% | 2815 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 58,030 psi | 89% | 2766 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 57,798 psi | 89% | 2808 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2749 fps | 97.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2730 fps | 95.9% |
| Norma 200 | <<locked>> | 82% | 58,508 psi | 90% | 2717 fps | 100% |
| Norma 201 | <<locked>> | 92% | 56,652 psi | 87% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 92% | 57,029 psi | 88% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 96% | 58,189 psi | 90% | 2861 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 48,254 psi | 74% | 2753 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 94% | 55,303 psi | 85% | 2838 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,384 psi | 73% | 2736 fps | 95.8% |
| Ramshot TAC | <<locked>> | 90% | 57,754 psi | 89% | 2808 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 90% | 57,116 psi | 88% | 2828 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 58,595 psi | 90% | 2795 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 54% | 1713 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,014 psi | 88% | 2779 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 57,334 psi | 88% | 2808 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,796 psi | 86% | 2887 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,216 psi | 85% | 2920 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,964 psi | 74% | 2772 fps | 97.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,023 psi | 75% | 2795 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 90% | 57,609 psi | 89% | 2766 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,971 psi | 88% | 2776 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 2858 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2779 fps | 96% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2749 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 57,479 psi | 88% | 2815 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 57,798 psi | 89% | 2808 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2730 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,710 psi | 87% | 2746 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 58,160 psi | 89% | 2434 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,057 psi | 86% | 2769 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 57,000 psi | 88% | 2867 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,173 psi | 86% | 2723 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,898 psi | 86% | 2782 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,391 psi | 87% | 2808 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 58,726 psi | 90% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 58,247 psi | 90% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,925 psi | 83% | 2703 fps | 96.2% |
| Somchem S321 | <<locked>> | 88% | 58,798 psi | 90% | 2828 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 57,725 psi | 89% | 2726 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,317 psi | 85% | 2776 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 55,593 psi | 86% | 2805 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,888 psi | 66% | 2700 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 88% | 58,407 psi | 90% | 2694 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 58,624 psi | 90% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,362 psi | 87% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,696 psi | 89% | 2766 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,261 psi | 88% | 2785 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,821 psi | 78% | 2749 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 90% | 57,783 psi | 89% | 2792 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,767 psi | 86% | 2762 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,734 psi | 77% | 2753 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,779 psi | 80% | 2740 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 57,406 psi | 88% | 2841 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,156 psi | 80% | 2812 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,072 psi | 86% | 2815 fps | 99.9% |
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% | 43,352 psi | 67% | 2520 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,108 psi | 72% | 2618 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,824 psi | 55% | 2434 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,453 psi | 65% | 2579 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 53,417 psi | 82% | 2694 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 33,837 psi | 52% | 2418 fps | 99.2% |
| Accurate 4350 | <<locked>> | 94% | 39,218 psi | 60% | 2589 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 51,547 psi | 79% | 2595 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,938 psi | 80% | 2618 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,842 psi | 61% | 2526 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 36,071 psi | 55% | 2431 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 52,127 psi | 80% | 2710 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,829 psi | 64% | 2543 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 41,234 psi | 63% | 2546 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,588 psi | 75% | 2736 fps | 99.3% |
| Alliant Power Pro 2000-MR | 57.6 gr | 82% | 38,348 psi | 59% | 2589 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,069 psi | 51% | 2398 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,936 psi | 75% | 2615 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,737 psi | 55% | 2457 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,463 psi | 58% | 2546 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,751 psi | 53% | 2513 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,676 psi | 78% | 2595 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,682 psi | 60% | 2523 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 32,503 psi | 50% | 2398 fps | 96.1% |
| Bofors RP7 | <<locked>> | 98% | 52,649 psi | 81% | 2726 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,859 psi | 67% | 2539 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,045 psi | 62% | 2556 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,874 psi | 67% | 2684 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 47,645 psi | 73% | 2644 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,486 psi | 75% | 2667 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,886 psi | 63% | 2559 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 98% | 48,718 psi | 75% | 2753 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,147 psi | 62% | 2539 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,156 psi | 53% | 2444 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,911 psi | 55% | 2500 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,947 psi | 40% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,595 psi | 59% | 2493 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 39,204 psi | 60% | 2546 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,491 psi | 55% | 2411 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,936 psi | 75% | 2638 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,313 psi | 76% | 2579 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,430 psi | 79% | 2710 fps | 95.6% |
| IMR 4831 | <<locked>> | 94% | 37,913 psi | 58% | 2543 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,535 psi | 56% | 2490 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 80% | 41,829 psi | 64% | 2543 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 46,905 psi | 72% | 2625 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 38,319 psi | 59% | 2510 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 40,466 psi | 62% | 2477 fps | 97.4% |
| Lovex S062 | <<locked>> | 80% | 35,389 psi | 54% | 2421 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 44,570 psi | 69% | 2602 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 47,761 psi | 73% | 2677 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 55,013 psi | 85% | 2674 fps | 100% |
| Norma 201 | <<locked>> | 80% | 38,972 psi | 60% | 2484 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 39,073 psi | 60% | 2500 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,099 psi | 54% | 2448 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 39,842 psi | 61% | 2592 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 34,418 psi | 53% | 2451 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 98% | 44,512 psi | 68% | 2684 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 41,684 psi | 64% | 2536 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,872 psi | 63% | 2559 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,179 psi | 70% | 2585 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,107 psi | 40% | 1526 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,905 psi | 72% | 2628 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 47,268 psi | 73% | 2648 fps | 95.5% |
| ReloadSwiss RS 52 | 54.5 gr | 80% | 36,811 psi | 57% | 2546 fps | 95.7% |
| ReloadSwiss RS 60 | 55.4 gr | 80% | 30,516 psi | 47% | 2411 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 39,218 psi | 60% | 2608 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,931 psi | 66% | 2677 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 42,801 psi | 66% | 2536 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,188 psi | 57% | 2438 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 32,561 psi | 50% | 2392 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 98% | 52,649 psi | 81% | 2726 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,570 psi | 69% | 2602 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,319 psi | 59% | 2510 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 35,389 psi | 54% | 2421 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 47,761 psi | 73% | 2677 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,530 psi | 76% | 2641 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 55,201 psi | 85% | 2398 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,518 psi | 81% | 2720 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,808 psi | 52% | 2441 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,632 psi | 76% | 2635 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,711 psi | 61% | 2507 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,334 psi | 59% | 2497 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,611 psi | 62% | 2454 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,460 psi | 51% | 2323 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,502 psi | 78% | 2654 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,918 psi | 69% | 2618 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,074 psi | 62% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,450 psi | 61% | 2510 fps | 97% |
| Somchem S355 | <<locked>> | 80% | 31,531 psi | 49% | 2352 fps | 95% |
| Somchem S365 | <<locked>> | 88% | 29,254 psi | 45% | 2375 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 45,992 psi | 71% | 2523 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,785 psi | 63% | 2454 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,143 psi | 56% | 2434 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,956 psi | 57% | 2438 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,950 psi | 46% | 2293 fps | 96% |
| Vihtavuori N160 | <<locked>> | 92% | 39,175 psi | 60% | 2543 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 41,843 psi | 64% | 2539 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 35,534 psi | 55% | 2421 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 92% | 38,305 psi | 59% | 2543 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,735 psi | 50% | 2369 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 40,944 psi | 63% | 2579 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 48,718 psi | 75% | 2753 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,623 psi | 58% | 2497 fps | 97.3% |
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 104 powders for .338 Weatherby RPM loaded with the .338 | 200gr | Alaska Bullet Works Kodiak SP SPBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,949 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 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 200.0 gr projectile in 0.338" calls for a 1:16.0 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, ReloadSwiss RS 52, ReloadSwiss RS 60 rank at the top here: for .338 Weatherby RPM with the .338 | 200gr | Alaska Bullet Works Kodiak SP SPBC 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.