Load Specifications
Bullet Manufacturer:Woodleigh
Bullet Weight:300 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 | 300gr | Woodleigh RN SN bullet and 108 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
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>> | 84% | 54,752 psi | 88% | 2080 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,420 psi | 90% | 2146 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,434 psi | 90% | 2139 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,824 psi | 88% | 2162 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,767 psi | 89% | 2159 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 39,494 psi | 63% | 2051 fps | 97.6% |
| Accurate 4064 | <<locked>> | 92% | 56,231 psi | 90% | 2182 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2260 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 53,490 psi | 86% | 2172 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,607 psi | 88% | 2175 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 47,863 psi | 77% | 2169 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,941 psi | 90% | 2169 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,621 psi | 86% | 2106 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 52,823 psi | 85% | 2274 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 47,195 psi | 76% | 2165 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,404 psi | 87% | 2192 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,868 psi | 88% | 2208 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,606 psi | 86% | 2267 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,636 psi | 88% | 2293 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 46,499 psi | 75% | 2159 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,189 psi | 61% | 2077 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 33,910 psi | 54% | 2001 fps | 96.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,351 psi | 68% | 2205 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,214 psi | 85% | 2192 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 54,824 psi | 88% | 2205 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,882 psi | 88% | 2185 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,389 psi | 87% | 2113 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,288 psi | 89% | 2201 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,519 psi | 86% | 2238 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,767 psi | 89% | 2218 fps | 100% |
| Hodgdon H414 | <<locked>> | 98% | 54,897 psi | 88% | 2264 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 96% | 55,956 psi | 90% | 2234 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 86% | 53,983 psi | 87% | 2178 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,676 psi | 80% | 2165 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,098 psi | 85% | 2208 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,782 psi | 89% | 2303 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 57% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,172 psi | 88% | 2182 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,085 psi | 87% | 2159 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,925 psi | 86% | 2159 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,954 psi | 87% | 2149 fps | 99% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2211 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,505 psi | 86% | 2172 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,576 psi | 84% | 2215 fps | 100% |
| IMR 4895 | <<locked>> | 90% | 56,260 psi | 90% | 2231 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,941 psi | 90% | 2169 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,376 psi | 90% | 2159 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,127 psi | 85% | 2152 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,301 psi | 85% | 2113 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 53,693 psi | 86% | 2152 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,130 psi | 90% | 2205 fps | 99.8% |
| Lovex S070 | <<locked>> | 98% | 53,417 psi | 86% | 2195 fps | 99.1% |
| Norma 201 | <<locked>> | 88% | 55,767 psi | 89% | 2165 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,130 psi | 90% | 2162 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,099 psi | 87% | 2198 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2254 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 42,453 psi | 68% | 2172 fps | 97.1% |
| Norma URPᴾ | <<locked>> | 100% | 54,795 psi | 88% | 2254 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 54,534 psi | 87% | 2224 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,606 psi | 86% | 2257 fps | 99.6% |
| Ramshot TAC | <<locked>> | 86% | 55,999 psi | 90% | 2195 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,738 psi | 89% | 2205 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,287 psi | 85% | 2136 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 58% | 1312 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,593 psi | 89% | 2149 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,115 psi | 90% | 2208 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,506 psi | 89% | 2264 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,447 psi | 87% | 2290 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2283 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2313 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 53,679 psi | 86% | 2110 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,057 psi | 90% | 2162 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,708 psi | 88% | 2198 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2146 fps | 95.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 45,020 psi | 72% | 2142 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 96% | 54,882 psi | 88% | 2185 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,130 psi | 90% | 2205 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,127 psi | 85% | 2152 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,693 psi | 86% | 2152 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,417 psi | 86% | 2195 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,217 psi | 90% | 2247 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,592 psi | 88% | 2178 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,303 psi | 89% | 2192 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,070 psi | 87% | 2073 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,128 psi | 87% | 2077 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,185 psi | 85% | 2133 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2136 fps | 96.2% |
| Somchem S321 | <<locked>> | 82% | 53,621 psi | 86% | 2159 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,505 psi | 86% | 2077 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,288 psi | 87% | 2172 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 54,839 psi | 88% | 2192 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,197 psi | 79% | 2215 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 45,687 psi | 73% | 2129 fps | 97.3% |
| Vihtavuori N130 | <<locked>> | 82% | 53,911 psi | 86% | 2041 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,317 psi | 87% | 2060 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,028 psi | 90% | 2129 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,417 psi | 86% | 2113 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,391 psi | 90% | 2175 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,882 psi | 86% | 2208 fps | 100% |
| Vihtavuori N530 | <<locked>> | 84% | 53,171 psi | 85% | 2133 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,549 psi | 87% | 2149 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2257 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,611 psi | 67% | 2133 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,969 psi | 87% | 2192 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,246 psi | 90% | 2208 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,187 psi | 88% | 2267 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,156 psi | 55% | 2093 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,143 psi | 88% | 2201 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% | 48,486 psi | 78% | 2014 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,837 psi | 85% | 2106 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,089 psi | 66% | 1969 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,993 psi | 77% | 2087 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 40,379 psi | 65% | 1955 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 32,387 psi | 52% | 1929 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,856 psi | 62% | 1969 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 28,297 psi | 45% | 1850 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 44,527 psi | 71% | 2057 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,985 psi | 61% | 1949 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 42,148 psi | 68% | 2083 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,615 psi | 75% | 2057 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 46,862 psi | 75% | 2034 fps | 100% |
| Alliant Power Pro 2000-MR | 44.5 gr | 80% | 40,306 psi | 65% | 2093 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 41,916 psi | 67% | 2083 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,492 psi | 60% | 1965 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,277 psi | 65% | 2014 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 29,240 psi | 47% | 1860 fps | 96% |
| Alliant Reloder-17 | 43.8 gr | 80% | 32,213 psi | 52% | 1952 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 41,350 psi | 66% | 2080 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 25,295 psi | 41% | 1798 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 31,836 psi | 51% | 1955 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 30,124 psi | 48% | 1965 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,613 psi | 70% | 2067 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 37,188 psi | 60% | 1972 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 38,189 psi | 61% | 1952 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,486 psi | 78% | 2044 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,208 psi | 72% | 2080 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,053 psi | 80% | 2195 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,913 psi | 61% | 1975 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 34,925 psi | 56% | 1969 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 40,886 psi | 66% | 2028 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,933 psi | 72% | 2064 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,687 psi | 43% | 1785 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,930 psi | 66% | 2051 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 39,349 psi | 63% | 2070 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 43% | 1142 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,207 psi | 69% | 2031 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 44,715 psi | 72% | 2051 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,900 psi | 64% | 1972 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,206 psi | 68% | 1988 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 38,014 psi | 61% | 1972 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 37,275 psi | 60% | 1936 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 27,702 psi | 44% | 1821 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,234 psi | 66% | 2037 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,615 psi | 75% | 2057 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 52,460 psi | 84% | 2116 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,671 psi | 70% | 2041 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,686 psi | 72% | 2005 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 39,827 psi | 64% | 1975 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 32,663 psi | 52% | 1860 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 34,882 psi | 56% | 1919 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,700 psi | 70% | 2018 fps | 100% |
| Norma 202 | <<locked>> | 80% | 43,888 psi | 70% | 2018 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,624 psi | 64% | 2005 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 42,627 psi | 68% | 2080 fps | 95.2% |
| Norma MRP | <<locked>> | 96% | 37,246 psi | 60% | 2080 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 28,950 psi | 46% | 1850 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,943 psi | 62% | 2018 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 34,287 psi | 55% | 1965 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 46,398 psi | 74% | 2073 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,963 psi | 74% | 2087 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,024 psi | 80% | 2096 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 43% | 1171 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,112 psi | 84% | 2113 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,348 psi | 61% | 1962 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,366 psi | 68% | 2096 fps | 99.7% |
| ReloadSwiss RS 60 | 43.8 gr | 80% | 34,258 psi | 55% | 1998 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 28,224 psi | 45% | 1864 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 30,342 psi | 49% | 1906 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 47,674 psi | 76% | 2037 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,611 psi | 67% | 1982 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 34,867 psi | 56% | 1929 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 46,427 psi | 74% | 2106 fps | 95% |
| Rottweil R 905 | <<locked>> | 98% | 42,337 psi | 68% | 2103 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 38,189 psi | 61% | 1952 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 32,663 psi | 52% | 1860 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,671 psi | 70% | 2041 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,827 psi | 64% | 1975 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 34,882 psi | 56% | 1919 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,853 psi | 57% | 1972 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,527 psi | 71% | 2051 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,033 psi | 69% | 2037 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,991 psi | 72% | 1969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,434 psi | 60% | 1873 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 36,042 psi | 58% | 1896 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 41,989 psi | 67% | 2096 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 50,241 psi | 81% | 2119 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,628 psi | 72% | 1975 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,425 psi | 71% | 2051 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 35,853 psi | 57% | 1932 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 26,034 psi | 42% | 1821 fps | 98.1% |
| Somchem S385 | <<locked>> | 94% | 37,565 psi | 60% | 2005 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,763 psi | 81% | 2005 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,339 psi | 73% | 1962 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,075 psi | 66% | 1959 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,481 psi | 67% | 1969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,910 psi | 54% | 1880 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 30,255 psi | 49% | 1850 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 80% | 46,775 psi | 75% | 2057 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,958 psi | 64% | 1969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 29,646 psi | 48% | 1854 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 25,135 psi | 40% | 1811 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,110 psi | 48% | 1837 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 46,383 psi | 74% | 2093 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 35,114 psi | 56% | 1972 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 25,121 psi | 40% | 1857 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,438 psi | 68% | 2041 fps | 100% |
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 108 powders for .338 RCM loaded with the .338 | 300gr | Woodleigh RN SN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,313 fps; across all powders the maximum-charge window runs from 1,283 fps to 2,313 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 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 300.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .338 RCM with the .338 | 300gr | Woodleigh RN SN 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.