Load Specifications
Bullet Manufacturer:Nosler
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 | Nosler Partition RN bullet and 107 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 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>> | 88% | 55,405 psi | 89% | 2326 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,490 psi | 86% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,260 psi | 90% | 2382 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,143 psi | 88% | 2405 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,243 psi | 85% | 2339 fps | 96.4% |
| Accurate 4064 | <<locked>> | 96% | 55,724 psi | 89% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,718 psi | 77% | 2395 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 54,636 psi | 88% | 2270 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,042 psi | 88% | 2293 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,114 psi | 87% | 2411 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 54,868 psi | 88% | 2408 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 55,405 psi | 89% | 2379 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,345 psi | 86% | 2369 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,534 psi | 86% | 2349 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,245 psi | 89% | 2461 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,200 psi | 85% | 2510 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,273 psi | 87% | 2425 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,172 psi | 88% | 2326 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,288 psi | 89% | 2448 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,340 psi | 76% | 2402 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2533 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,388 psi | 54% | 2175 fps | 96.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,853 psi | 86% | 2277 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,621 psi | 86% | 2428 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 54,636 psi | 88% | 2441 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2408 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,550 psi | 89% | 2356 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,724 psi | 89% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,751 psi | 86% | 2477 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 54,114 psi | 87% | 2365 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,187 psi | 88% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,202 psi | 90% | 2454 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2441 fps | 97.2% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2457 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 90% | 54,563 psi | 87% | 2421 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,627 psi | 70% | 2303 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,171 psi | 85% | 2448 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 52,460 psi | 84% | 2474 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 56% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,912 psi | 90% | 2421 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,143 psi | 87% | 2405 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,563 psi | 87% | 2395 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,230 psi | 89% | 2379 fps | 97.6% |
| IMR 4198 | <<locked>> | 84% | 55,564 psi | 89% | 2287 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 48,573 psi | 78% | 2339 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,143 psi | 87% | 2395 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,701 psi | 73% | 2349 fps | 98.6% |
| IMR 4895 | <<locked>> | 92% | 53,185 psi | 85% | 2431 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 53,345 psi | 86% | 2369 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,548 psi | 86% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,272 psi | 85% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,389 psi | 87% | 2349 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 54,041 psi | 87% | 2392 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2385 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2369 fps | 97.1% |
| Norma 201 | <<locked>> | 92% | 56,217 psi | 90% | 2405 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,272 psi | 85% | 2369 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,346 psi | 87% | 2438 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 47,529 psi | 76% | 2388 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 94% | 54,650 psi | 88% | 2461 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,905 psi | 75% | 2385 fps | 97.1% |
| Ramshot TAC | <<locked>> | 88% | 53,896 psi | 86% | 2392 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,347 psi | 90% | 2448 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,621 psi | 88% | 2375 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 57% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,301 psi | 85% | 2359 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,185 psi | 85% | 2392 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,216 psi | 89% | 2503 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,520 psi | 87% | 2530 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,369 psi | 76% | 2418 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,530 psi | 78% | 2438 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 53,998 psi | 87% | 2346 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,330 psi | 86% | 2362 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,491 psi | 87% | 2431 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2408 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2385 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,272 psi | 85% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,041 psi | 87% | 2392 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2369 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,405 psi | 90% | 2375 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,709 psi | 89% | 2392 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,376 psi | 90% | 2487 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,144 psi | 90% | 2343 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,564 psi | 89% | 2415 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,796 psi | 89% | 2431 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,158 psi | 88% | 2313 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,491 psi | 87% | 2310 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2346 fps | 97.2% |
| Somchem S321 | <<locked>> | 86% | 54,563 psi | 87% | 2405 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,201 psi | 87% | 2316 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,839 psi | 88% | 2405 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 55,056 psi | 88% | 2428 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,366 psi | 68% | 2349 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 54,911 psi | 88% | 2280 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,129 psi | 88% | 2300 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,840 psi | 90% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,853 psi | 86% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,200 psi | 85% | 2372 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,125 psi | 80% | 2388 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 53,766 psi | 86% | 2369 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,230 psi | 89% | 2388 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,124 psi | 79% | 2395 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,578 psi | 57% | 2241 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,966 psi | 82% | 2375 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 53,316 psi | 85% | 2415 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,459 psi | 83% | 2444 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,550 psi | 89% | 2441 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% | 43,250 psi | 69% | 2172 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,065 psi | 75% | 2267 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,882 psi | 58% | 2110 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,235 psi | 68% | 2234 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,748 psi | 80% | 2293 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 33,953 psi | 54% | 2103 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 33,881 psi | 54% | 2162 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 51,576 psi | 83% | 2234 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,967 psi | 83% | 2257 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,697 psi | 64% | 2195 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 33,808 psi | 54% | 2067 fps | 96.1% |
| ADI AR 2219 | <<locked>> | 80% | 51,924 psi | 83% | 2339 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,742 psi | 67% | 2201 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 41,118 psi | 66% | 2195 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,428 psi | 78% | 2369 fps | 99.8% |
| Alliant Power Pro 2000-MR | 46.1 gr | 80% | 35,708 psi | 57% | 2205 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,025 psi | 53% | 2087 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,037 psi | 79% | 2254 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,607 psi | 57% | 2136 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,098 psi | 53% | 2133 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,487 psi | 49% | 2100 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,704 psi | 48% | 2083 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,502 psi | 81% | 2238 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,522 psi | 62% | 2195 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 32,387 psi | 52% | 2090 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 46,021 psi | 74% | 2277 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,656 psi | 70% | 2195 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,842 psi | 64% | 2218 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,714 psi | 70% | 2333 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 47,718 psi | 77% | 2283 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,341 psi | 78% | 2306 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 35,534 psi | 57% | 2133 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 42,250 psi | 68% | 2300 fps | 95% |
| Hodgdon H4350 | <<locked>> | 96% | 49,530 psi | 79% | 2365 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,001 psi | 64% | 2205 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 28,311 psi | 45% | 2001 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,781 psi | 57% | 2175 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 45,585 psi | 73% | 2369 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 42% | 1263 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,595 psi | 62% | 2165 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 39,059 psi | 63% | 2201 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,447 psi | 57% | 2096 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,062 psi | 69% | 2198 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 49,342 psi | 79% | 2215 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 45,876 psi | 74% | 2300 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,223 psi | 73% | 2267 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 33,112 psi | 53% | 2129 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,405 psi | 58% | 2162 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 41,742 psi | 67% | 2201 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 46,862 psi | 75% | 2274 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,145 psi | 61% | 2175 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,263 psi | 65% | 2142 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 35,201 psi | 56% | 2100 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 39,276 psi | 63% | 2178 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 41,742 psi | 67% | 2238 fps | 95% |
| Norma 201 | <<locked>> | 80% | 39,088 psi | 63% | 2159 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 39,088 psi | 63% | 2165 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,969 psi | 56% | 2129 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 34,795 psi | 56% | 2169 fps | 95.7% |
| Ramshot Big Game | 46.1 gr | 80% | 34,258 psi | 55% | 2136 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 96% | 41,379 psi | 66% | 2293 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 41,582 psi | 67% | 2205 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,770 psi | 65% | 2221 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,991 psi | 72% | 2241 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,339 psi | 42% | 1293 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,673 psi | 75% | 2270 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,191 psi | 66% | 2211 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,695 psi | 59% | 2218 fps | 97.3% |
| ReloadSwiss RS 60 | 45.4 gr | 80% | 30,342 psi | 49% | 2106 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 33,910 psi | 54% | 2175 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,086 psi | 59% | 2231 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 42,772 psi | 69% | 2192 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,014 psi | 59% | 2113 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,385 psi | 49% | 2041 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 46,021 psi | 74% | 2277 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,276 psi | 63% | 2178 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,145 psi | 61% | 2175 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,201 psi | 56% | 2100 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 41,742 psi | 67% | 2238 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,327 psi | 79% | 2287 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,373 psi | 84% | 2352 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,502 psi | 51% | 2080 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,501 psi | 79% | 2264 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,639 psi | 64% | 2182 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,174 psi | 61% | 2169 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,509 psi | 65% | 2119 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,330 psi | 53% | 2008 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 43,830 psi | 70% | 2215 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 44,715 psi | 72% | 2270 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 40,161 psi | 64% | 2126 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,262 psi | 63% | 2178 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 31,589 psi | 51% | 2051 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 25,759 psi | 41% | 1988 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 45,847 psi | 74% | 2172 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,654 psi | 65% | 2116 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,042 psi | 58% | 2103 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,854 psi | 59% | 2113 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,834 psi | 48% | 1998 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 34,200 psi | 55% | 2123 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 41,713 psi | 67% | 2198 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 35,346 psi | 57% | 2103 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 90% | 35,723 psi | 57% | 2172 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 96% | 31,285 psi | 50% | 2149 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,631 psi | 46% | 1975 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 40,640 psi | 65% | 2234 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 42,496 psi | 68% | 2306 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,478 psi | 60% | 2172 fps | 98.4% |
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 107 powders for .338 RCM loaded with the .338 | 250gr | Nosler Partition RN. Alliant Reloder-17 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,414 fps to 2,533 fps. Accurate 4350 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, 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 60, Ramshot Big Game rank at the top here: for .338 RCM with the .338 | 250gr | Nosler Partition RN 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.