Load Specifications
Bullet Manufacturer:Alaska Bullet Works
Bullet Weight:275 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:1:15.0
Load data in caliber .338 RCM with .338 | 275gr | Alaska Bullet Works Kodiak SP SPBC bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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>> | 86% | 54,389 psi | 87% | 2182 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,202 psi | 90% | 2247 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,448 psi | 89% | 2238 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,302 psi | 87% | 2260 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,303 psi | 89% | 2247 fps | 97.6% |
| Accurate 4064 | <<locked>> | 94% | 55,114 psi | 88% | 2277 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,604 psi | 81% | 2306 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 53,272 psi | 85% | 2270 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 54,157 psi | 87% | 2270 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,869 psi | 90% | 2270 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,318 psi | 90% | 2241 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,041 psi | 87% | 2310 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,927 psi | 90% | 2415 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 53,606 psi | 86% | 2287 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,085 psi | 87% | 2182 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,143 psi | 87% | 2303 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,734 psi | 80% | 2316 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,780 psi | 86% | 2388 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,186 psi | 56% | 2106 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,508 psi | 62% | 2224 fps | 97.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,854 psi | 90% | 2172 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,231 psi | 90% | 2329 fps | 99.9% |
| Bofors RP3 | <<locked>> | 94% | 53,824 psi | 86% | 2297 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,360 psi | 87% | 2274 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,317 psi | 87% | 2215 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,810 psi | 88% | 2300 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 52,823 psi | 85% | 2336 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 53,113 psi | 85% | 2221 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,012 psi | 87% | 2247 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,332 psi | 89% | 2313 fps | 99.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2352 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 98% | 55,172 psi | 88% | 2320 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 88% | 53,809 psi | 86% | 2280 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,701 psi | 73% | 2215 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,999 psi | 90% | 2346 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2385 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 56% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,071 psi | 88% | 2280 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,301 psi | 85% | 2257 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,490 psi | 86% | 2254 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,085 psi | 87% | 2241 fps | 98.2% |
| IMR 4198 | <<locked>> | 82% | 54,360 psi | 87% | 2142 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 2251 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,084 psi | 85% | 2260 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,240 psi | 77% | 2260 fps | 99.5% |
| IMR 4895 | <<locked>> | 92% | 55,477 psi | 89% | 2326 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,869 psi | 90% | 2270 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 56,043 psi | 90% | 2257 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,811 psi | 89% | 2287 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,333 psi | 90% | 2247 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 53,040 psi | 85% | 2247 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2293 fps | 99.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2283 fps | 98.3% |
| Norma 201 | <<locked>> | 90% | 55,317 psi | 89% | 2264 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,593 psi | 89% | 2260 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,287 psi | 85% | 2293 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 51,285 psi | 82% | 2290 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 50,299 psi | 81% | 2303 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 53,737 psi | 86% | 2316 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,153 psi | 79% | 2297 fps | 98.4% |
| Ramshot TAC | <<locked>> | 88% | 56,173 psi | 90% | 2293 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,317 psi | 89% | 2303 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,214 psi | 85% | 2231 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 57% | 1368 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,259 psi | 89% | 2251 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,825 psi | 90% | 2300 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,346 psi | 87% | 2356 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,722 psi | 86% | 2388 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,067 psi | 80% | 2329 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,633 psi | 81% | 2349 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 53,330 psi | 86% | 2208 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,593 psi | 89% | 2257 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 53,693 psi | 86% | 2290 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,360 psi | 87% | 2274 fps | 97.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2293 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,811 psi | 89% | 2287 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,040 psi | 85% | 2247 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2283 fps | 98.3% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,969 psi | 88% | 2228 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,463 psi | 89% | 2346 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,056 psi | 88% | 2198 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,201 psi | 87% | 2270 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,679 psi | 88% | 2287 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,070 psi | 87% | 2172 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 53,534 psi | 86% | 2172 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,869 psi | 90% | 2254 fps | 98.4% |
| Somchem S321 | <<locked>> | 84% | 53,345 psi | 86% | 2260 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,347 psi | 90% | 2208 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,896 psi | 86% | 2267 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 54,099 psi | 87% | 2287 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,672 psi | 72% | 2260 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 53,882 psi | 86% | 2142 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,172 psi | 87% | 2159 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,984 psi | 88% | 2224 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,072 psi | 90% | 2244 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,608 psi | 89% | 2270 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2297 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 52,808 psi | 85% | 2228 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,201 psi | 87% | 2247 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,837 psi | 83% | 2306 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,637 psi | 60% | 2165 fps | 98.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2283 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,767 psi | 89% | 2310 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2352 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,270 psi | 50% | 2096 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,621 psi | 88% | 2297 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% | 45,324 psi | 73% | 2077 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,269 psi | 79% | 2169 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,797 psi | 61% | 2021 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,396 psi | 71% | 2139 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 42,902 psi | 69% | 2077 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,781 psi | 57% | 2018 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 29,457 psi | 47% | 1959 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 41,582 psi | 67% | 2106 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,476 psi | 57% | 1991 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,584 psi | 70% | 2113 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 43,265 psi | 69% | 2096 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,807 psi | 81% | 2270 fps | 100% |
| Alliant Power Pro 2000-MR | 44.5 gr | 80% | 37,391 psi | 60% | 2129 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,708 psi | 56% | 2008 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,894 psi | 82% | 2146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,362 psi | 60% | 2057 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 30,647 psi | 49% | 1972 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,834 psi | 48% | 1982 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 27,789 psi | 45% | 1939 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 33,765 psi | 54% | 2126 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,504 psi | 84% | 2136 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,495 psi | 65% | 2113 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 34,026 psi | 55% | 2008 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 42,554 psi | 68% | 2106 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,368 psi | 73% | 2100 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,843 psi | 67% | 2129 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,180 psi | 74% | 2244 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 49,661 psi | 80% | 2178 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,314 psi | 81% | 2201 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,085 psi | 56% | 2011 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 90% | 39,030 psi | 63% | 2129 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 45,919 psi | 74% | 2192 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 41,901 psi | 67% | 2116 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 26,281 psi | 42% | 1850 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,536 psi | 60% | 2093 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 41,727 psi | 67% | 2192 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 42% | 1191 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,118 psi | 64% | 2073 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 41,336 psi | 66% | 2110 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,231 psi | 60% | 2014 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 39,668 psi | 64% | 2031 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 51,430 psi | 82% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 42,380 psi | 68% | 2129 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 41,800 psi | 67% | 2096 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 30,748 psi | 49% | 1969 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,247 psi | 61% | 2080 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 43,584 psi | 70% | 2113 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 48,878 psi | 78% | 2175 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,350 psi | 65% | 2090 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,843 psi | 67% | 2054 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 36,811 psi | 59% | 2018 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 34,200 psi | 55% | 1972 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 38,798 psi | 62% | 2077 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 40,799 psi | 65% | 2070 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 40,901 psi | 66% | 2073 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,753 psi | 59% | 2047 fps | 98.6% |
| Norma 204 | <<locked>> | 98% | 48,225 psi | 77% | 2247 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 30,356 psi | 49% | 1965 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 36,027 psi | 58% | 2057 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 35,853 psi | 57% | 2080 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 43,424 psi | 70% | 2119 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,525 psi | 68% | 2133 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,949 psi | 75% | 2152 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 43% | 1224 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,776 psi | 78% | 2172 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 37,884 psi | 61% | 2041 fps | 95.4% |
| ReloadSwiss RS 52 | 43.1 gr | 80% | 38,638 psi | 62% | 2133 fps | 98.5% |
| ReloadSwiss RS 60 | 43.8 gr | 80% | 31,763 psi | 51% | 2034 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 31,560 psi | 51% | 2018 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 34,272 psi | 55% | 2067 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 44,715 psi | 72% | 2096 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,870 psi | 62% | 2031 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 32,082 psi | 51% | 1965 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 42,554 psi | 68% | 2106 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 34,200 psi | 55% | 1972 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,350 psi | 65% | 2090 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,811 psi | 59% | 2018 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 38,798 psi | 62% | 2077 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,459 psi | 83% | 2188 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,996 psi | 53% | 2005 fps | 97.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,735 psi | 83% | 2162 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,423 psi | 66% | 2096 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,856 psi | 64% | 2080 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,235 psi | 68% | 2028 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,954 psi | 56% | 1926 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 40,364 psi | 65% | 2051 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 46,876 psi | 75% | 2175 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,858 psi | 67% | 2031 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,234 psi | 66% | 2096 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 33,199 psi | 53% | 1972 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 24,047 psi | 39% | 1841 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 47,805 psi | 77% | 2070 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,511 psi | 68% | 2021 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,985 psi | 61% | 2014 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,624 psi | 62% | 2021 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,357 psi | 50% | 1919 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 31,807 psi | 51% | 1965 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 43,424 psi | 70% | 2106 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 37,188 psi | 60% | 2018 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 30,966 psi | 50% | 1965 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 29,327 psi | 47% | 1998 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,050 psi | 45% | 1867 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 42,656 psi | 68% | 2142 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 39,276 psi | 63% | 2136 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,731 psi | 44% | 1998 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,363 psi | 63% | 2090 fps | 99.3% |
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 | 275gr | Alaska Bullet Works Kodiak SP SPBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,415 fps; across all powders the maximum-charge window runs from 1,335 fps to 2,415 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 50–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .338 RCM with the .338 | 275gr | Alaska Bullet Works Kodiak SP SPBC 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.