Load Specifications
Bullet Manufacturer:North Fork
Bullet Weight:240 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:1:10.5
Load data in caliber .338 Weatherby RPM with .338 | 240gr | NorthFork Bonded Core bullet and 110 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, Hodgdon CFE223 and Ramshot Big Game.
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>> | 90% | 57,203 psi | 88% | 2405 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,551 psi | 89% | 2500 fps | 99.7% |
| Accurate 2230 | <<locked>> | 82% | 58,682 psi | 90% | 2513 fps | 99.9% |
| Accurate 2460 | <<locked>> | 86% | 55,970 psi | 86% | 2438 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 58,059 psi | 89% | 2461 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,464 psi | 88% | 2490 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,259 psi | 85% | 2418 fps | 96.3% |
| Accurate 4064 | <<locked>> | 98% | 57,653 psi | 89% | 2500 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,209 psi | 71% | 2431 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 84% | 57,087 psi | 88% | 2359 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,493 psi | 88% | 2382 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,217 psi | 86% | 2497 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 98% | 56,971 psi | 88% | 2490 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 84% | 57,899 psi | 89% | 2467 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,564 psi | 85% | 2457 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,477 psi | 85% | 2431 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 57,290 psi | 88% | 2549 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,651 psi | 86% | 2598 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,217 psi | 86% | 2510 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 57,145 psi | 88% | 2408 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 57,276 psi | 88% | 2530 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,282 psi | 71% | 2438 fps | 98.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,258 psi | 82% | 2569 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,590 psi | 50% | 2201 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,057 psi | 86% | 2359 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,753 psi | 86% | 2510 fps | 99.5% |
| Bofors RP3 | <<locked>> | 98% | 56,855 psi | 87% | 2526 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,157 psi | 83% | 2448 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,595 psi | 89% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 58,001 psi | 89% | 2530 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,318 psi | 87% | 2572 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 56,260 psi | 87% | 2451 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,377 psi | 88% | 2477 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 58,552 psi | 90% | 2539 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2474 fps | 96.4% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2493 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 92% | 56,724 psi | 87% | 2507 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,293 psi | 65% | 2336 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,317 psi | 85% | 2533 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,737 psi | 53% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 58,102 psi | 89% | 2507 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 56,086 psi | 86% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,449 psi | 87% | 2474 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,392 psi | 88% | 2461 fps | 97.5% |
| IMR 4198 | <<locked>> | 86% | 57,508 psi | 88% | 2369 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,086 psi | 86% | 2474 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,121 psi | 68% | 2382 fps | 98% |
| IMR 4895 | <<locked>> | 96% | 58,668 psi | 90% | 2559 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 55,564 psi | 85% | 2457 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,637 psi | 86% | 2444 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,172 psi | 85% | 2474 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,347 psi | 87% | 2431 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 56,101 psi | 86% | 2474 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,619 psi | 79% | 2425 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,950 psi | 75% | 2405 fps | 96.3% |
| Norma 200 | <<locked>> | 82% | 57,116 psi | 88% | 2385 fps | 100% |
| Norma 201 | <<locked>> | 94% | 58,465 psi | 90% | 2490 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,390 psi | 85% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,318 psi | 87% | 2520 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2425 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 96% | 56,681 psi | 87% | 2543 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,658 psi | 70% | 2418 fps | 96.3% |
| Ramshot TAC | <<locked>> | 90% | 56,144 psi | 86% | 2477 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,187 psi | 85% | 2490 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 57,000 psi | 88% | 2464 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,172 psi | 54% | 1486 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 58,784 psi | 90% | 2484 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,347 psi | 85% | 2474 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,464 psi | 88% | 2592 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 2621 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,876 psi | 71% | 2448 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,152 psi | 73% | 2467 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 90% | 56,014 psi | 86% | 2431 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 58,682 psi | 90% | 2484 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,362 psi | 87% | 2513 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,157 psi | 83% | 2448 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,619 psi | 79% | 2425 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,172 psi | 85% | 2474 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,101 psi | 86% | 2474 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,950 psi | 75% | 2405 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,158 psi | 85% | 2418 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,305 psi | 88% | 2126 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 58,305 psi | 90% | 2484 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 58,392 psi | 90% | 2572 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 58,189 psi | 90% | 2428 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,928 psi | 89% | 2500 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 58,102 psi | 89% | 2516 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,058 psi | 88% | 2395 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,782 psi | 87% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,909 psi | 80% | 2382 fps | 96.5% |
| Somchem S321 | <<locked>> | 88% | 56,913 psi | 88% | 2490 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,072 psi | 86% | 2395 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,985 psi | 88% | 2490 fps | 99.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,927 psi | 88% | 2510 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,191 psi | 63% | 2382 fps | 99.7% |
| Vihtavuori N120 | <<locked>> | 82% | 58,813 psi | 90% | 2320 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 57,145 psi | 88% | 2365 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,942 psi | 88% | 2379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,725 psi | 89% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,637 psi | 86% | 2431 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 2454 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,820 psi | 75% | 2425 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 90% | 56,057 psi | 86% | 2454 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 57,159 psi | 88% | 2470 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,761 psi | 73% | 2431 fps | 98.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,301 psi | 53% | 2264 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,922 psi | 77% | 2415 fps | 99.8% |
| Winchester 748 | <<locked>> | 90% | 55,288 psi | 85% | 2500 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,067 psi | 77% | 2480 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 94% | 57,812 psi | 89% | 2526 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% | 42,279 psi | 65% | 2215 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,969 psi | 83% | 2454 fps | 99.4% |
| Accurate 2230 | <<locked>> | 80% | 54,636 psi | 84% | 2464 fps | 99.7% |
| Accurate 2460 | <<locked>> | 80% | 45,847 psi | 71% | 2306 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,621 psi | 53% | 2142 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,988 psi | 63% | 2267 fps | 99.9% |
| Accurate 2700 | <<locked>> | 92% | 51,909 psi | 80% | 2375 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 32,779 psi | 50% | 2133 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 35,128 psi | 54% | 2238 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 50,691 psi | 78% | 2280 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,082 psi | 79% | 2300 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,740 psi | 60% | 2228 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 33,040 psi | 51% | 2100 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 50,633 psi | 78% | 2382 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,770 psi | 63% | 2241 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 40,001 psi | 62% | 2238 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,195 psi | 73% | 2408 fps | 99.6% |
| Alliant Power Pro 2000-MR | 46.9 gr | 80% | 34,925 psi | 54% | 2238 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,140 psi | 49% | 2119 fps | 96.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,732 psi | 73% | 2293 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,679 psi | 53% | 2169 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,405 psi | 56% | 2251 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,662 psi | 49% | 2175 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,705 psi | 47% | 2152 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,313 psi | 76% | 2280 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,449 psi | 58% | 2224 fps | 96.3% |
| Bofors RP3 | <<locked>> | 80% | 31,401 psi | 48% | 2116 fps | 96.8% |
| Bofors RP7 | <<locked>> | 96% | 47,805 psi | 74% | 2356 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,714 psi | 66% | 2234 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,885 psi | 60% | 2257 fps | 99.3% |
| Hodgdon CFE223 | 48 gr | 80% | 42,641 psi | 66% | 2369 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 46,325 psi | 71% | 2323 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,079 psi | 72% | 2346 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 37,014 psi | 57% | 2211 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 98% | 46,731 psi | 72% | 2428 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 98% | 51,459 psi | 79% | 2448 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,015 psi | 60% | 2238 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,198 psi | 48% | 2116 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,983 psi | 54% | 2208 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,817 psi | 40% | 1293 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,681 psi | 58% | 2198 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 37,985 psi | 58% | 2238 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,635 psi | 53% | 2126 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,976 psi | 69% | 2280 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 48,515 psi | 75% | 2264 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,007 psi | 72% | 2346 fps | 95.4% |
| IMR 4831 | <<locked>> | 92% | 34,287 psi | 53% | 2201 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 35,447 psi | 55% | 2195 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 40,770 psi | 63% | 2241 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 45,571 psi | 70% | 2310 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 37,014 psi | 57% | 2208 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 39,479 psi | 61% | 2178 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 34,345 psi | 53% | 2133 fps | 97.9% |
| Lovex S065 | <<locked>> | 92% | 40,553 psi | 62% | 2251 fps | 95.4% |
| Lovex S070 | <<locked>> | 98% | 45,992 psi | 71% | 2359 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 53,650 psi | 83% | 2346 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,942 psi | 58% | 2188 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 38,087 psi | 59% | 2201 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,040 psi | 52% | 2159 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 35,926 psi | 55% | 2241 fps | 95.5% |
| Ramshot Big Game | 46.9 gr | 80% | 33,475 psi | 51% | 2165 fps | 96% |
| Ramshot Hunter | <<locked>> | 98% | 42,946 psi | 66% | 2369 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 40,466 psi | 62% | 2234 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,668 psi | 61% | 2254 fps | 97.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,150 psi | 68% | 2280 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,092 psi | 40% | 1325 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,818 psi | 70% | 2313 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,801 psi | 66% | 2287 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,578 psi | 55% | 2247 fps | 96.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,501 psi | 45% | 2129 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,724 psi | 58% | 2303 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,176 psi | 63% | 2362 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 41,843 psi | 64% | 2231 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,158 psi | 56% | 2149 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 29,530 psi | 45% | 2067 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 96% | 47,805 psi | 74% | 2356 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,553 psi | 62% | 2251 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,014 psi | 57% | 2208 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 34,345 psi | 53% | 2133 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 98% | 45,992 psi | 71% | 2359 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,341 psi | 74% | 2326 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,462 psi | 84% | 2096 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,039 psi | 79% | 2395 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,808 psi | 50% | 2159 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,501 psi | 75% | 2310 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,537 psi | 59% | 2211 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,188 psi | 57% | 2198 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,668 psi | 61% | 2159 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,619 psi | 50% | 2044 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,440 psi | 70% | 2293 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 43,482 psi | 67% | 2306 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 39,044 psi | 60% | 2159 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,145 psi | 59% | 2211 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 30,618 psi | 47% | 2077 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 26,614 psi | 41% | 2054 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 55,230 psi | 85% | 2283 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 44,991 psi | 69% | 2215 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,784 psi | 61% | 2156 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,128 psi | 54% | 2142 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,955 psi | 55% | 2146 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 29,008 psi | 45% | 2024 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 35,520 psi | 55% | 2198 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 40,683 psi | 63% | 2234 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 34,621 psi | 53% | 2139 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 92% | 36,927 psi | 57% | 2244 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 98% | 32,227 psi | 50% | 2218 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,704 psi | 46% | 2044 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 39,697 psi | 61% | 2274 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 46,978 psi | 72% | 2431 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,390 psi | 56% | 2205 fps | 97.8% |
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 110 powders for .338 Weatherby RPM loaded with the .338 | 240gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,447 fps to 2,621 fps. Accurate 4350 gives the best case fill at 100 %, and 110 of the 110 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 240.0 gr projectile in 0.338" calls for a 1:10.5 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, Hodgdon CFE223, Ramshot Big Game rank at the top here: for .338 Weatherby RPM with the .338 | 240gr | 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.