Load Specifications
Bullet:.338 | 250gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 RCM load data
Case Length (l3):2"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:71 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:15.5
Load data in caliber .338 RCM with .338 | 250gr | Swift A-Frame bullet and 106 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% | 54,186 psi | 87% | 2303 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,898 psi | 90% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,824 psi | 88% | 2359 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,722 psi | 86% | 2375 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,376 psi | 89% | 2356 fps | 96.6% |
| Accurate 4064 | <<locked>> | 96% | 54,273 psi | 87% | 2395 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2365 fps | 98.5% |
| Accurate LT-30 | <<locked>> | 82% | 53,751 psi | 86% | 2251 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,201 psi | 87% | 2270 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,275 psi | 90% | 2428 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 53,708 psi | 86% | 2379 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 82% | 54,186 psi | 87% | 2356 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,463 psi | 89% | 2385 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,579 psi | 89% | 2362 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,911 psi | 86% | 2434 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,637 psi | 89% | 2530 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,246 psi | 90% | 2441 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,143 psi | 87% | 2306 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,998 psi | 87% | 2421 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,108 psi | 74% | 2369 fps | 98.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,200 psi | 85% | 2500 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,677 psi | 52% | 2146 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,985 psi | 90% | 2290 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,912 psi | 90% | 2444 fps | 99.6% |
| Bofors RP3 | <<locked>> | 96% | 53,359 psi | 86% | 2415 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2379 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,578 psi | 88% | 2333 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,157 psi | 87% | 2415 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,333 psi | 90% | 2500 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 52,881 psi | 85% | 2339 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,882 psi | 86% | 2365 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,766 psi | 88% | 2421 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,922 psi | 80% | 2411 fps | 96.7% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2425 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 90% | 53,272 psi | 85% | 2392 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,351 psi | 68% | 2270 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,448 psi | 89% | 2467 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 51,213 psi | 82% | 2441 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,838 psi | 56% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,650 psi | 88% | 2395 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 56,260 psi | 90% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,359 psi | 86% | 2365 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,114 psi | 87% | 2349 fps | 97.2% |
| IMR 4198 | <<locked>> | 84% | 54,505 psi | 87% | 2267 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2408 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,338 psi | 71% | 2320 fps | 98.3% |
| IMR 4895 | <<locked>> | 94% | 55,390 psi | 89% | 2448 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 55,463 psi | 89% | 2385 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,724 psi | 89% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,506 psi | 89% | 2408 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,084 psi | 85% | 2323 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 55,956 psi | 90% | 2405 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,721 psi | 83% | 2359 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,849 psi | 78% | 2339 fps | 96.6% |
| Norma 201 | <<locked>> | 92% | 54,897 psi | 88% | 2379 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,390 psi | 89% | 2382 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,318 psi | 90% | 2451 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2359 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 94% | 53,185 psi | 85% | 2431 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,542 psi | 73% | 2349 fps | 96.5% |
| Ramshot TAC | <<locked>> | 90% | 56,202 psi | 90% | 2408 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,201 psi | 89% | 2421 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,461 psi | 86% | 2349 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,070 psi | 56% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,347 psi | 89% | 2372 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,288 psi | 89% | 2405 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,751 psi | 86% | 2474 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,243 psi | 85% | 2503 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,890 psi | 74% | 2382 fps | 98.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,253 psi | 76% | 2405 fps | 97.8% |
| Rottweil R 901 | <<locked>> | 90% | 56,289 psi | 90% | 2362 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,434 psi | 89% | 2375 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2441 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2379 fps | 96.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,721 psi | 83% | 2359 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,506 psi | 89% | 2408 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,956 psi | 90% | 2405 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,849 psi | 78% | 2339 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,405 psi | 89% | 2349 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,650 psi | 88% | 2369 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,882 psi | 88% | 2461 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,100 psi | 88% | 2323 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,099 psi | 87% | 2385 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,679 psi | 88% | 2405 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,070 psi | 87% | 2290 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,519 psi | 86% | 2290 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2316 fps | 96.8% |
| Somchem S321 | <<locked>> | 86% | 53,330 psi | 86% | 2379 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,999 psi | 90% | 2326 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,679 psi | 86% | 2382 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 53,490 psi | 86% | 2402 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,162 psi | 66% | 2316 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 53,998 psi | 87% | 2264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,027 psi | 87% | 2277 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,636 psi | 88% | 2346 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,767 psi | 89% | 2362 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2382 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,791 psi | 78% | 2359 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 90% | 56,376 psi | 90% | 2388 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,809 psi | 86% | 2362 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,892 psi | 77% | 2365 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,418 psi | 55% | 2208 fps | 96.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,719 psi | 80% | 2349 fps | 99.8% |
| Winchester 748 | <<locked>> | 90% | 55,550 psi | 89% | 2431 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,169 psi | 80% | 2415 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,085 psi | 87% | 2411 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 | 68% | 2149 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,977 psi | 74% | 2241 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,708 psi | 56% | 2083 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,147 psi | 66% | 2208 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 48,660 psi | 78% | 2264 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 32,866 psi | 53% | 2073 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 32,764 psi | 53% | 2133 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 50,676 psi | 81% | 2215 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,068 psi | 82% | 2234 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,899 psi | 62% | 2169 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 33,069 psi | 53% | 2044 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 50,691 psi | 81% | 2313 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,944 psi | 66% | 2178 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 40,059 psi | 64% | 2172 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,427 psi | 76% | 2346 fps | 99.7% |
| Alliant Power Pro 2000-MR | 45 gr | 80% | 34,867 psi | 56% | 2175 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,242 psi | 52% | 2064 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,950 psi | 77% | 2231 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,838 psi | 56% | 2113 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 34,287 psi | 55% | 2146 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 82% | 29,602 psi | 47% | 2067 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,690 psi | 49% | 2100 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,545 psi | 79% | 2218 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,666 psi | 60% | 2169 fps | 96.7% |
| Bofors RP3 | <<locked>> | 80% | 31,415 psi | 50% | 2060 fps | 97.1% |
| Bofors RP7 | <<locked>> | 96% | 47,950 psi | 77% | 2293 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,830 psi | 69% | 2172 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,870 psi | 62% | 2192 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,714 psi | 68% | 2306 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 46,499 psi | 75% | 2257 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,297 psi | 76% | 2283 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 34,867 psi | 56% | 2106 fps | 95% |
| Hodgdon H414 | <<locked>> | 96% | 43,801 psi | 70% | 2316 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 98% | 51,387 psi | 82% | 2379 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 39,218 psi | 63% | 2182 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 29,399 psi | 47% | 2018 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,853 psi | 56% | 2146 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 98% | 47,659 psi | 76% | 2385 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,802 psi | 41% | 1250 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,608 psi | 60% | 2139 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 38,058 psi | 61% | 2175 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,664 psi | 56% | 2070 fps | 96.5% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,991 psi | 72% | 2218 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 48,486 psi | 78% | 2195 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 44,193 psi | 71% | 2238 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 34,301 psi | 55% | 2146 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 35,636 psi | 57% | 2139 fps | 97.4% |
| IMR 8208 XBR | <<locked>> | 80% | 40,944 psi | 66% | 2178 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 80% | 45,527 psi | 73% | 2247 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,057 psi | 59% | 2149 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 39,523 psi | 63% | 2119 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 34,403 psi | 55% | 2077 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 38,232 psi | 61% | 2149 fps | 95.1% |
| Lovex S070 | <<locked>> | 96% | 43,439 psi | 70% | 2257 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 38,014 psi | 61% | 2129 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 38,203 psi | 61% | 2142 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,229 psi | 55% | 2103 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 33,837 psi | 54% | 2136 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 33,460 psi | 54% | 2110 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 96% | 40,306 psi | 65% | 2260 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 40,712 psi | 65% | 2178 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,856 psi | 64% | 2198 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,092 psi | 71% | 2218 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,107 psi | 42% | 1283 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,818 psi | 73% | 2247 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 43,047 psi | 69% | 2231 fps | 95.6% |
| ReloadSwiss RS 52 | 43.6 gr | 80% | 35,665 psi | 57% | 2188 fps | 96.8% |
| ReloadSwiss RS 60 | 44.3 gr | 80% | 29,602 psi | 47% | 2077 fps | 97.9% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 35,259 psi | 57% | 2195 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 38,711 psi | 62% | 2254 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 41,814 psi | 67% | 2169 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,187 psi | 58% | 2090 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 29,617 psi | 47% | 2014 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 96% | 47,950 psi | 77% | 2293 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 38,232 psi | 61% | 2149 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,057 psi | 59% | 2149 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 34,403 psi | 55% | 2077 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 96% | 43,439 psi | 70% | 2257 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,312 psi | 77% | 2260 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,256 psi | 82% | 2329 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,719 psi | 49% | 2054 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,733 psi | 78% | 2247 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,522 psi | 62% | 2149 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,231 psi | 60% | 2139 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,871 psi | 64% | 2100 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,764 psi | 53% | 1991 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,469 psi | 73% | 2231 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 43,729 psi | 70% | 2244 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 39,117 psi | 63% | 2100 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,377 psi | 62% | 2156 fps | 97.9% |
| Somchem S355 | <<locked>> | 80% | 30,676 psi | 49% | 2021 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 26,760 psi | 43% | 2005 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 45,165 psi | 72% | 2152 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,001 psi | 64% | 2096 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,302 psi | 57% | 2083 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,042 psi | 58% | 2087 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,095 psi | 47% | 1972 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 90% | 35,462 psi | 57% | 2139 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 40,654 psi | 65% | 2172 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,635 psi | 56% | 2080 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 34,766 psi | 56% | 2146 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 32,430 psi | 52% | 2165 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,660 psi | 48% | 1991 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 39,566 psi | 63% | 2208 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 44,019 psi | 71% | 2320 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,550 psi | 59% | 2146 fps | 98.1% |
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 106 powders for .338 RCM loaded with the .338 | 250gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,530 fps; across all powders the maximum-charge window runs from 1,404 fps to 2,530 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 250.0 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, ReloadSwiss RS 60 rank at the top here: for .338 RCM with the .338 | 250gr | Swift A-Frame 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.