Load Specifications
Bullet Manufacturer:Cutting Edge
Bullet Weight:260 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:1:11.0
Load data in caliber .338 Weatherby RPM with .338 | 260gr | CutEdge Maximus 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, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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% | 57,276 psi | 88% | 2320 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,738 psi | 86% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 58,537 psi | 90% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 57,827 psi | 89% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,419 psi | 85% | 2352 fps | 97.5% |
| Accurate 4064 | <<locked>> | 96% | 58,218 psi | 90% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,415 psi | 78% | 2411 fps | 99.6% |
| Accurate LT-30 | <<locked>> | 82% | 56,681 psi | 87% | 2270 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 57,145 psi | 88% | 2293 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,420 psi | 87% | 2418 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 57,377 psi | 88% | 2415 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 57,899 psi | 89% | 2382 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,695 psi | 86% | 2375 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,912 psi | 86% | 2343 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,551 psi | 89% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,956 psi | 86% | 2526 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,898 psi | 88% | 2431 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,043 psi | 88% | 2320 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 57,551 psi | 89% | 2451 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,443 psi | 76% | 2415 fps | 99.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,711 psi | 89% | 2546 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,853 psi | 54% | 2195 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,232 psi | 59% | 2316 fps | 97.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,767 psi | 86% | 2274 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,057 psi | 86% | 2434 fps | 99.9% |
| Bofors RP3 | <<locked>> | 96% | 57,493 psi | 88% | 2448 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 57,870 psi | 89% | 2425 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 88% | 57,595 psi | 89% | 2356 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 58,305 psi | 90% | 2448 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,739 psi | 87% | 2490 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 56,623 psi | 87% | 2365 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 57,305 psi | 88% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 58,653 psi | 90% | 2461 fps | 99.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,056 psi | 83% | 2461 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 98% | 55,361 psi | 85% | 2428 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 90% | 56,942 psi | 88% | 2425 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,658 psi | 70% | 2313 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,883 psi | 86% | 2454 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,071 psi | 85% | 2493 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 54% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 58,247 psi | 90% | 2425 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,753 psi | 87% | 2405 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,913 psi | 88% | 2402 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,246 psi | 88% | 2388 fps | 98.5% |
| IMR 4198 | <<locked>> | 84% | 57,421 psi | 88% | 2280 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,879 psi | 78% | 2356 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,362 psi | 87% | 2408 fps | 98.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,921 psi | 74% | 2362 fps | 99.4% |
| IMR 4895 | <<locked>> | 92% | 55,521 psi | 85% | 2434 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,695 psi | 86% | 2375 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,695 psi | 86% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,579 psi | 86% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,304 psi | 87% | 2352 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 56,304 psi | 87% | 2395 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 2398 fps | 99.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,518 psi | 81% | 2385 fps | 98.1% |
| Norma 201 | <<locked>> | 92% | 58,465 psi | 90% | 2408 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,637 psi | 86% | 2369 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,652 psi | 87% | 2441 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 51,488 psi | 79% | 2398 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,140 psi | 77% | 2405 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 94% | 57,508 psi | 88% | 2470 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,298 psi | 76% | 2405 fps | 98.3% |
| Ramshot TAC | <<locked>> | 88% | 55,840 psi | 86% | 2398 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,434 psi | 85% | 2411 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,739 psi | 87% | 2382 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 54% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,143 psi | 85% | 2356 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,709 psi | 86% | 2405 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 58,276 psi | 90% | 2513 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 57,551 psi | 89% | 2543 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,125 psi | 77% | 2431 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,821 psi | 78% | 2457 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 88% | 55,854 psi | 86% | 2346 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 58,653 psi | 90% | 2402 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 57,014 psi | 88% | 2438 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 57,870 psi | 89% | 2425 fps | 98.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,201 psi | 85% | 2398 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,579 psi | 86% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,304 psi | 87% | 2395 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,518 psi | 81% | 2385 fps | 98.1% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 58,784 psi | 90% | 2379 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 57,914 psi | 89% | 2392 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,376 psi | 85% | 2451 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 58,233 psi | 90% | 2339 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,972 psi | 89% | 2425 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 58,349 psi | 90% | 2438 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,971 psi | 88% | 2310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,753 psi | 87% | 2310 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2359 fps | 98.3% |
| Somchem S321 | <<locked>> | 86% | 56,739 psi | 87% | 2405 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,043 psi | 86% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 57,305 psi | 88% | 2411 fps | 100% |
| Somchem S355 | <<locked>> | 98% | 57,493 psi | 88% | 2434 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,599 psi | 69% | 2362 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 56,855 psi | 87% | 2277 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,072 psi | 88% | 2297 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 58,552 psi | 90% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,912 psi | 86% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,593 psi | 86% | 2375 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,765 psi | 81% | 2402 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 88% | 56,188 psi | 86% | 2375 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 57,624 psi | 89% | 2392 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,561 psi | 79% | 2405 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,275 psi | 57% | 2254 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,519 psi | 82% | 2388 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,840 psi | 86% | 2418 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,056 psi | 83% | 2461 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,980 psi | 48% | 2182 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 92% | 58,117 psi | 89% | 2444 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% | 44,686 psi | 69% | 2169 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,631 psi | 75% | 2264 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,840 psi | 57% | 2103 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,772 psi | 67% | 2234 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,310 psi | 70% | 2215 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 34,896 psi | 54% | 2100 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 30,792 psi | 47% | 2080 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 53,301 psi | 82% | 2234 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,722 psi | 83% | 2257 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,220 psi | 63% | 2201 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 34,940 psi | 54% | 2073 fps | 97.2% |
| ADI AR 2219 | <<locked>> | 80% | 54,027 psi | 83% | 2336 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,323 psi | 67% | 2208 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 43,004 psi | 66% | 2192 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,589 psi | 78% | 2375 fps | 100% |
| Alliant Power Pro 2000-MR | 48 gr | 80% | 37,115 psi | 57% | 2221 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,200 psi | 53% | 2093 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,546 psi | 78% | 2244 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,985 psi | 57% | 2146 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,242 psi | 50% | 2100 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,472 psi | 45% | 2064 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 27,311 psi | 42% | 2014 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 33,330 psi | 51% | 2211 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,344 psi | 81% | 2238 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,161 psi | 62% | 2205 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 33,388 psi | 51% | 2090 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 42,163 psi | 65% | 2201 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,237 psi | 70% | 2198 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,510 psi | 64% | 2224 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,774 psi | 70% | 2343 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 49,501 psi | 76% | 2283 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,140 psi | 77% | 2306 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,490 psi | 53% | 2093 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 92% | 41,553 psi | 64% | 2274 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 45,759 psi | 70% | 2293 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 41,539 psi | 64% | 2211 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,514 psi | 42% | 1969 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,405 psi | 58% | 2185 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 44,527 psi | 69% | 2339 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 40% | 1253 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,885 psi | 61% | 2169 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 40,756 psi | 63% | 2201 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,651 psi | 56% | 2100 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,785 psi | 64% | 2165 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 51,155 psi | 79% | 2211 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 42,119 psi | 65% | 2224 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 41,626 psi | 64% | 2192 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 30,240 psi | 47% | 2051 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 37,855 psi | 58% | 2172 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 43,323 psi | 67% | 2208 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 48,327 psi | 74% | 2274 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,610 psi | 61% | 2178 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,524 psi | 64% | 2146 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 36,318 psi | 56% | 2103 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 35,882 psi | 55% | 2100 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 40,741 psi | 63% | 2208 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 40,205 psi | 62% | 2159 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 40,393 psi | 62% | 2165 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,347 psi | 56% | 2139 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 48,066 psi | 74% | 2349 fps | 95% |
| Norma URP | <<locked>> | 86% | 31,821 psi | 49% | 2090 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 35,694 psi | 55% | 2146 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 37,927 psi | 58% | 2215 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 43,062 psi | 66% | 2215 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,221 psi | 65% | 2228 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,688 psi | 72% | 2251 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,324 psi | 40% | 1286 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,443 psi | 75% | 2270 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 37,507 psi | 58% | 2129 fps | 95% |
| ReloadSwiss RS 52 | 46.5 gr | 80% | 38,305 psi | 59% | 2228 fps | 98.3% |
| ReloadSwiss RS 60 | 47.3 gr | 80% | 31,444 psi | 48% | 2119 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,127 psi | 51% | 2146 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 36,187 psi | 56% | 2205 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 43,888 psi | 68% | 2188 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,087 psi | 59% | 2116 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 31,531 psi | 49% | 2047 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 42,163 psi | 65% | 2201 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 35,882 psi | 55% | 2100 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,610 psi | 61% | 2178 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,318 psi | 56% | 2103 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 40,741 psi | 63% | 2208 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,271 psi | 79% | 2290 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 54,230 psi | 83% | 2349 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,619 psi | 50% | 2090 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,532 psi | 79% | 2264 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,901 psi | 63% | 2185 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,566 psi | 61% | 2175 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,843 psi | 64% | 2119 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,534 psi | 53% | 2011 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 40,030 psi | 62% | 2139 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 46,456 psi | 71% | 2274 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,336 psi | 64% | 2123 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,901 psi | 63% | 2188 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 32,619 psi | 50% | 2054 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 24,874 psi | 38% | 1952 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 47,456 psi | 73% | 2169 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,148 psi | 65% | 2116 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,492 psi | 58% | 2103 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,334 psi | 59% | 2116 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,951 psi | 48% | 2005 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 31,270 psi | 48% | 2047 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 43,062 psi | 66% | 2201 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 36,637 psi | 56% | 2106 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 32,634 psi | 50% | 2093 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 28,790 psi | 44% | 2073 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,572 psi | 42% | 1939 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 42,583 psi | 66% | 2244 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 41,553 psi | 64% | 2274 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,151 psi | 42% | 2070 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,856 psi | 60% | 2178 fps | 99.2% |
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 | 260gr | CutEdge Maximus. Alliant Reloder-17 delivers the highest muzzle velocity at 2,546 fps; across all powders the maximum-charge window runs from 1,407 fps to 2,546 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 48–90 %, leaving at least 10 % headroom. The 260.0 gr projectile in 0.338" calls for a 1:11.0 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 60, ReloadSwiss RS 52 rank at the top here: for .338 Weatherby RPM with the .338 | 260gr | CutEdge Maximus 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.