Load Specifications
Bullet Manufacturer:Woodleigh
Bullet Weight:300 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 x 63 load data
Case Length (l3):2.48"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:75.5 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:23.62"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:15.5
Load data in caliber 8.5 x 63 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 ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 54,723 psi | 88% | 2096 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,258 psi | 85% | 2123 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,636 psi | 88% | 2175 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,637 psi | 89% | 2182 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,352 psi | 70% | 2119 fps | 98.6% |
| Accurate 4064 | <<locked>> | 88% | 53,403 psi | 86% | 2165 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 52,910 psi | 85% | 2247 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 53,679 psi | 86% | 2192 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,636 psi | 88% | 2195 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,097 psi | 82% | 2234 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,970 psi | 90% | 2185 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,853 psi | 86% | 2119 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,837 psi | 85% | 2290 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,650 psi | 88% | 2208 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,114 psi | 88% | 2228 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,128 psi | 87% | 2290 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,347 psi | 89% | 2316 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2228 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 43,700 psi | 70% | 2178 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,278 psi | 66% | 2142 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,405 psi | 58% | 2070 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,035 psi | 74% | 2280 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,229 psi | 85% | 2211 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 55,288 psi | 89% | 2224 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 43,700 psi | 70% | 2178 fps | 96.4% |
| Bofors RP7 | <<locked>> | 94% | 55,100 psi | 88% | 2211 fps | 99% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,317 psi | 87% | 2129 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,143 psi | 88% | 2211 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,970 psi | 90% | 2238 fps | 100% |
| Hodgdon H414 | <<locked>> | 96% | 55,608 psi | 89% | 2290 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 94% | 56,101 psi | 90% | 2257 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 84% | 54,201 psi | 87% | 2198 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2228 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,359 psi | 86% | 2228 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,767 psi | 89% | 2326 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,085 psi | 88% | 2195 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,476 psi | 87% | 2175 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,201 psi | 87% | 2178 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,896 psi | 86% | 2169 fps | 99.2% |
| IMR 4350 | <<locked>> | 98% | 55,274 psi | 89% | 2234 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,490 psi | 86% | 2192 fps | 99.1% |
| IMR 4831 | <<locked>> | 98% | 53,563 psi | 86% | 2241 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 53,229 psi | 85% | 2211 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 50,923 psi | 82% | 2182 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 84% | 55,970 psi | 90% | 2185 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,345 psi | 86% | 2169 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,333 psi | 90% | 2169 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,099 psi | 87% | 2175 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,289 psi | 90% | 2224 fps | 99.9% |
| Lovex S070 | <<locked>> | 96% | 53,896 psi | 86% | 2221 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,216 psi | 58% | 2008 fps | 97% |
| Norma 201 | <<locked>> | 86% | 55,564 psi | 89% | 2178 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,246 psi | 90% | 2178 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,346 psi | 87% | 2218 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,883 psi | 90% | 2280 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 46,137 psi | 74% | 2247 fps | 98.3% |
| Norma URP | <<locked>> | 98% | 55,434 psi | 89% | 2277 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 54,694 psi | 88% | 2241 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,027 psi | 87% | 2280 fps | 99.7% |
| Ramshot TAC | <<locked>> | 84% | 56,057 psi | 90% | 2215 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,709 psi | 89% | 2224 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,376 psi | 90% | 2188 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,347 psi | 58% | 1335 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,318 psi | 90% | 2228 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,927 psi | 90% | 2283 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,056 psi | 88% | 2310 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,985 psi | 90% | 2310 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,390 psi | 89% | 2336 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 53,693 psi | 86% | 2123 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,072 psi | 90% | 2178 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,143 psi | 88% | 2218 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 2211 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,820 psi | 78% | 2215 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 94% | 55,100 psi | 88% | 2211 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,289 psi | 90% | 2224 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,345 psi | 86% | 2169 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,099 psi | 87% | 2175 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,896 psi | 86% | 2221 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,287 psi | 85% | 2231 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,534 psi | 87% | 2195 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,390 psi | 89% | 2211 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,766 psi | 86% | 2087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,027 psi | 87% | 2093 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,113 psi | 85% | 2152 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,370 psi | 78% | 2211 fps | 97.5% |
| Somchem S335 | <<locked>> | 86% | 56,318 psi | 90% | 2123 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,288 psi | 87% | 2188 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,274 psi | 89% | 2215 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2211 fps | 96.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,417 psi | 86% | 2274 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2195 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 84% | 54,128 psi | 87% | 2073 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,086 psi | 90% | 2142 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,461 psi | 86% | 2126 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,316 psi | 85% | 2159 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,462 psi | 87% | 2231 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 42,685 psi | 68% | 2090 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 84% | 56,405 psi | 90% | 2185 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,795 psi | 88% | 2165 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,476 psi | 86% | 2241 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,600 psi | 73% | 2198 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,230 psi | 87% | 2215 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,866 psi | 85% | 2185 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,941 psi | 90% | 2297 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,028 psi | 59% | 2172 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,143 psi | 88% | 2218 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 46,456 psi | 74% | 2146 fps | 96.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,416 psi | 82% | 2060 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,266 psi | 71% | 2018 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,387 psi | 82% | 2139 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,975 psi | 69% | 2014 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 31,038 psi | 50% | 1909 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,901 psi | 67% | 2021 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,792 psi | 49% | 1909 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 47,239 psi | 76% | 2110 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 40,263 psi | 65% | 2001 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 94% | 42,395 psi | 68% | 2106 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,342 psi | 79% | 2106 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,444 psi | 81% | 2083 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,294 psi | 69% | 2159 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,147 psi | 64% | 2018 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,917 psi | 69% | 2067 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,285 psi | 50% | 1923 fps | 97.3% |
| Alliant Reloder-17 | 47 gr | 80% | 34,592 psi | 55% | 2014 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 94% | 41,684 psi | 67% | 2103 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 41,104 psi | 66% | 2136 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 24,105 psi | 39% | 1778 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 32,314 psi | 52% | 1985 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 86% | 28,660 psi | 46% | 1946 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,427 psi | 74% | 2123 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 39,885 psi | 64% | 2028 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 41,104 psi | 66% | 2136 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 35,897 psi | 58% | 1926 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,879 psi | 82% | 2090 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,573 psi | 78% | 2136 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,596 psi | 65% | 2031 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 35,389 psi | 57% | 1991 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 38,711 psi | 62% | 2008 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 47,747 psi | 77% | 2116 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,747 psi | 46% | 1844 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,830 psi | 70% | 2106 fps | 100% |
| Hodgdon Superformance | 52.2 gr | 84% | 36,869 psi | 59% | 2041 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1165 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,847 psi | 74% | 2083 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 47,819 psi | 77% | 2100 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,308 psi | 68% | 2024 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,744 psi | 72% | 2044 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 35,969 psi | 58% | 1952 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,347 psi | 60% | 1952 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 29,965 psi | 48% | 1877 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 43,990 psi | 71% | 2090 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 47,964 psi | 77% | 2139 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,342 psi | 79% | 2106 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,775 psi | 75% | 2093 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,065 psi | 75% | 2054 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 42,337 psi | 68% | 2024 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,940 psi | 56% | 1916 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 35,244 psi | 57% | 1939 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 31,981 psi | 51% | 1929 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 46,543 psi | 75% | 2070 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,804 psi | 75% | 2070 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,293 psi | 68% | 2060 fps | 99.9% |
| Norma 204 | <<locked>> | 90% | 43,004 psi | 69% | 2103 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 35,476 psi | 57% | 2060 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 31,154 psi | 50% | 1909 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 42,061 psi | 67% | 2077 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 32,518 psi | 52% | 1942 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 49,066 psi | 79% | 2129 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,878 psi | 78% | 2142 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,214 psi | 85% | 2152 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 44% | 1194 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,785 psi | 65% | 2018 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,643 psi | 73% | 2156 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,811 psi | 59% | 2060 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,574 psi | 49% | 1923 fps | 96.6% |
| ReloadSwiss RS 70 | 47.8 gr | 80% | 30,574 psi | 49% | 1926 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 50,575 psi | 81% | 2087 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,164 psi | 71% | 2031 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,536 psi | 60% | 1982 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 96% | 46,615 psi | 75% | 2129 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 40,364 psi | 65% | 2087 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 35,897 psi | 58% | 1926 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,940 psi | 56% | 1916 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,775 psi | 75% | 2093 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,337 psi | 68% | 2024 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 35,244 psi | 57% | 1939 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,493 psi | 62% | 2028 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,703 psi | 76% | 2113 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,745 psi | 73% | 2090 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,674 psi | 76% | 2018 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,856 psi | 64% | 1923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 33,895 psi | 54% | 1870 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 40,001 psi | 64% | 2083 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 47,355 psi | 76% | 2021 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,297 psi | 76% | 2103 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,406 psi | 62% | 1988 fps | 99.8% |
| Somchem S361 | <<locked>> | 98% | 51,111 psi | 82% | 2169 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 28,036 psi | 45% | 1877 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 35,984 psi | 58% | 1991 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 48,066 psi | 77% | 2008 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,990 psi | 71% | 2008 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,208 psi | 71% | 2018 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,361 psi | 58% | 1932 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 32,489 psi | 52% | 1909 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 37,710 psi | 60% | 2011 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 49,516 psi | 79% | 2106 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,627 psi | 68% | 2018 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,981 psi | 51% | 1913 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 25,730 psi | 41% | 1834 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,010 psi | 51% | 1890 fps | 99% |
| Winchester 748 | <<locked>> | 80% | 49,429 psi | 79% | 2146 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 35,389 psi | 57% | 1991 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 23,917 psi | 38% | 1837 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,411 psi | 73% | 2096 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 40,611 psi | 65% | 2060 fps | 95.1% |
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 108 powders for 8.5 x 63 loaded with the .338 | 300gr | Woodleigh RN SN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,336 fps; across all powders the maximum-charge window runs from 1,306 fps to 2,336 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 58–90 %, 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, ADI AR 2209, Alliant Reloder-19 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8.5 x 63 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.