Load Specifications
Bullet Manufacturer:North Fork
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:1:17.0
Load data in caliber .338 Weatherby RPM with .338 | 200gr | NorthFork Bonded Core 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% | 56,289 psi | 87% | 2713 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 58,479 psi | 90% | 2785 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 57,667 psi | 89% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,594 psi | 87% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 57,870 psi | 89% | 2769 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 57,203 psi | 88% | 2815 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,385 psi | 76% | 2779 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 82% | 55,448 psi | 85% | 2654 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,854 psi | 86% | 2680 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,230 psi | 85% | 2802 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 56,289 psi | 87% | 2799 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 82% | 56,710 psi | 87% | 2779 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 57,914 psi | 89% | 2808 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 58,450 psi | 90% | 2785 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,173 psi | 86% | 2864 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 58,523 psi | 90% | 2969 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,738 psi | 86% | 2822 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,970 psi | 86% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,507 psi | 87% | 2841 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,617 psi | 75% | 2785 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 2936 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 58,349 psi | 90% | 2700 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,013 psi | 85% | 2818 fps | 99.1% |
| Bofors RP3 | <<locked>> | 96% | 56,144 psi | 86% | 2835 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,826 psi | 87% | 2795 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,594 psi | 87% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 57,261 psi | 88% | 2841 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,172 psi | 85% | 2881 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 55,100 psi | 85% | 2756 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,434 psi | 87% | 2789 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 57,580 psi | 89% | 2844 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 2831 fps | 96.4% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 2851 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 90% | 55,709 psi | 86% | 2815 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,628 psi | 69% | 2667 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 58,421 psi | 90% | 2897 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,998 psi | 54% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,290 psi | 88% | 2818 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 55,303 psi | 85% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,840 psi | 86% | 2785 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,362 psi | 87% | 2766 fps | 96.8% |
| IMR 4198 | <<locked>> | 84% | 56,275 psi | 87% | 2677 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,434 psi | 85% | 2779 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,079 psi | 72% | 2723 fps | 97.9% |
| IMR 4895 | <<locked>> | 94% | 57,943 psi | 89% | 2874 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 57,914 psi | 89% | 2808 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 58,421 psi | 90% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 58,233 psi | 90% | 2831 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 58,682 psi | 90% | 2782 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 58,740 psi | 90% | 2828 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2772 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,663 psi | 79% | 2749 fps | 96.2% |
| Norma 201 | <<locked>> | 92% | 57,392 psi | 88% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 92% | 58,059 psi | 89% | 2805 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,651 psi | 86% | 2828 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 49,052 psi | 75% | 2769 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 94% | 56,173 psi | 86% | 2854 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,225 psi | 74% | 2759 fps | 96.2% |
| Ramshot TAC | <<locked>> | 90% | 58,552 psi | 90% | 2828 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 58,001 psi | 89% | 2848 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,622 psi | 86% | 2762 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,288 psi | 54% | 1719 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,783 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 58,160 psi | 89% | 2828 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,884 psi | 88% | 2910 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,304 psi | 87% | 2940 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,979 psi | 75% | 2799 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,922 psi | 77% | 2818 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 90% | 58,421 psi | 90% | 2782 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 57,725 psi | 89% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,028 psi | 86% | 2825 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,826 psi | 87% | 2795 fps | 96.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2772 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 58,233 psi | 90% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 58,740 psi | 90% | 2828 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,663 psi | 79% | 2749 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,696 psi | 89% | 2766 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 58,668 psi | 90% | 2444 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,826 psi | 87% | 2789 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 57,841 psi | 89% | 2884 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,913 psi | 88% | 2736 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,782 psi | 87% | 2802 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,290 psi | 88% | 2828 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,927 psi | 86% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,666 psi | 86% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2726 fps | 96.5% |
| Somchem S321 | <<locked>> | 86% | 55,738 psi | 86% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 58,465 psi | 90% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,188 psi | 86% | 2795 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 56,521 psi | 87% | 2825 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,830 psi | 67% | 2723 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 55,767 psi | 86% | 2667 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,912 psi | 86% | 2684 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,174 psi | 88% | 2762 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 58,407 psi | 90% | 2779 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 58,189 psi | 90% | 2805 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,634 psi | 79% | 2769 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 90% | 58,769 psi | 90% | 2812 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 56,637 psi | 87% | 2782 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,749 psi | 78% | 2776 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,605 psi | 81% | 2759 fps | 99.8% |
| Winchester 748 | <<locked>> | 90% | 58,088 psi | 89% | 2854 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 2831 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,956 psi | 88% | 2835 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% | 44,005 psi | 68% | 2536 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,935 psi | 74% | 2638 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,622 psi | 56% | 2454 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,004 psi | 66% | 2592 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 54,215 psi | 83% | 2713 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 34,635 psi | 53% | 2438 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 37,507 psi | 58% | 2559 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 52,141 psi | 80% | 2612 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,533 psi | 81% | 2635 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,364 psi | 62% | 2546 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 36,579 psi | 56% | 2448 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 52,982 psi | 82% | 2730 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,395 psi | 65% | 2559 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 41,974 psi | 65% | 2559 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,226 psi | 76% | 2753 fps | 99.5% |
| Alliant Power Pro 2000-MR | 58.5 gr | 82% | 38,928 psi | 60% | 2608 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,591 psi | 52% | 2415 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,661 psi | 76% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,245 psi | 56% | 2474 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,159 psi | 59% | 2572 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 33,199 psi | 51% | 2480 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,358 psi | 79% | 2608 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,320 psi | 60% | 2539 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 32,996 psi | 51% | 2415 fps | 96.4% |
| Bofors RP7 | <<locked>> | 98% | 53,461 psi | 82% | 2746 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,396 psi | 68% | 2556 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,756 psi | 63% | 2575 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,831 psi | 69% | 2707 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 48,559 psi | 75% | 2661 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,255 psi | 76% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,856 psi | 60% | 2523 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 98% | 49,472 psi | 76% | 2776 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 98% | 54,186 psi | 83% | 2795 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 40,712 psi | 63% | 2556 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,764 psi | 50% | 2415 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,550 psi | 56% | 2520 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 40% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,073 psi | 60% | 2510 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 39,871 psi | 61% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,013 psi | 55% | 2428 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,792 psi | 77% | 2661 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 50,053 psi | 77% | 2595 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 49,168 psi | 76% | 2680 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 36,303 psi | 56% | 2513 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 37,101 psi | 57% | 2507 fps | 96.7% |
| IMR 8208 XBR | <<locked>> | 80% | 42,395 psi | 65% | 2559 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 47,645 psi | 73% | 2644 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 39,102 psi | 60% | 2530 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 41,017 psi | 63% | 2493 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 35,940 psi | 55% | 2441 fps | 97.6% |
| Lovex S065 | <<locked>> | 92% | 42,496 psi | 65% | 2569 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 48,617 psi | 75% | 2700 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 39,740 psi | 61% | 2507 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 39,653 psi | 61% | 2516 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 35,636 psi | 55% | 2464 fps | 96.2% |
| Norma URP | <<locked>> | 92% | 37,971 psi | 58% | 2559 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 35,027 psi | 54% | 2470 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 98% | 45,223 psi | 70% | 2703 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 42,293 psi | 65% | 2552 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,539 psi | 64% | 2575 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,847 psi | 71% | 2605 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,223 psi | 40% | 1535 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,688 psi | 73% | 2644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 45,034 psi | 69% | 2615 fps | 95% |
| ReloadSwiss RS 52 | 55.4 gr | 80% | 37,565 psi | 58% | 2569 fps | 96.1% |
| ReloadSwiss RS 60 | 56.2 gr | 80% | 30,893 psi | 48% | 2428 fps | 97.1% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 39,929 psi | 61% | 2628 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,482 psi | 67% | 2697 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 43,381 psi | 67% | 2552 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,724 psi | 58% | 2457 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 31,024 psi | 48% | 2359 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 98% | 53,461 psi | 82% | 2746 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,496 psi | 65% | 2569 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,102 psi | 60% | 2530 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 35,940 psi | 55% | 2441 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 48,617 psi | 75% | 2700 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,285 psi | 77% | 2661 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 55,753 psi | 86% | 2411 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,258 psi | 82% | 2736 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,418 psi | 53% | 2461 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,372 psi | 77% | 2648 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,306 psi | 62% | 2523 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,986 psi | 60% | 2516 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,176 psi | 63% | 2470 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,997 psi | 52% | 2339 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 48,138 psi | 74% | 2621 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 45,614 psi | 70% | 2638 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 40,828 psi | 63% | 2474 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,103 psi | 62% | 2530 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 32,227 psi | 50% | 2372 fps | 95.5% |
| Somchem S365 | <<locked>> | 88% | 29,892 psi | 46% | 2402 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 46,644 psi | 72% | 2539 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,350 psi | 64% | 2467 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,796 psi | 57% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,521 psi | 58% | 2454 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 30,414 psi | 47% | 2310 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 92% | 39,929 psi | 61% | 2562 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 42,395 psi | 65% | 2556 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 36,201 psi | 56% | 2441 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 39,044 psi | 60% | 2562 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,141 psi | 51% | 2385 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 41,510 psi | 64% | 2595 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 49,705 psi | 76% | 2779 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,101 psi | 59% | 2513 fps | 97.5% |
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 | NorthFork Bonded Core. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,969 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 1:17.0 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 | NorthFork Bonded Core 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.