Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:250 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:1:11.5
Load data in caliber 8.5 x 63 with .338 | 250gr | Berger Hybrid OTM Tactical bullet and 106 powders. The key underlying parameters are shown in the table above.
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>> | 88% | 54,027 psi | 87% | 2290 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 56,101 psi | 90% | 2359 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,955 psi | 88% | 2349 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,911 psi | 86% | 2369 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,492 psi | 89% | 2346 fps | 96.4% |
| Accurate 4064 | <<locked>> | 96% | 54,476 psi | 87% | 2385 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,383 psi | 74% | 2356 fps | 98.4% |
| Accurate LT-30 | <<locked>> | 82% | 53,954 psi | 87% | 2244 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,360 psi | 87% | 2264 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,420 psi | 90% | 2418 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 53,809 psi | 86% | 2372 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 82% | 54,404 psi | 87% | 2349 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,622 psi | 89% | 2375 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,767 psi | 89% | 2356 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,766 psi | 86% | 2421 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,753 psi | 89% | 2520 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,434 psi | 90% | 2431 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,998 psi | 87% | 2293 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,824 psi | 86% | 2408 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2359 fps | 98.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,330 psi | 86% | 2490 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,735 psi | 52% | 2136 fps | 96.2% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,144 psi | 90% | 2283 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,072 psi | 90% | 2434 fps | 99.6% |
| Bofors RP3 | <<locked>> | 96% | 53,200 psi | 85% | 2402 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 2369 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,694 psi | 88% | 2326 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,346 psi | 87% | 2405 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 52,562 psi | 84% | 2441 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 84% | 53,084 psi | 85% | 2333 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,983 psi | 87% | 2359 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,868 psi | 88% | 2411 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,995 psi | 80% | 2398 fps | 96.6% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2418 fps | 96% |
| Hodgdon H4895 | <<locked>> | 90% | 53,388 psi | 86% | 2382 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,467 psi | 68% | 2264 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,622 psi | 89% | 2457 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 51,329 psi | 82% | 2431 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,766 psi | 56% | 1398 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,752 psi | 88% | 2385 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 56,086 psi | 90% | 2408 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,476 psi | 86% | 2359 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,273 psi | 87% | 2343 fps | 97.1% |
| IMR 4198 | <<locked>> | 84% | 54,665 psi | 88% | 2260 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,420 psi | 90% | 2398 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,454 psi | 71% | 2310 fps | 98.1% |
| IMR 4895 | <<locked>> | 94% | 55,216 psi | 89% | 2434 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 55,622 psi | 89% | 2375 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,840 psi | 90% | 2369 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,608 psi | 89% | 2398 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,229 psi | 85% | 2316 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 56,057 psi | 90% | 2395 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,880 psi | 83% | 2349 fps | 98% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,008 psi | 79% | 2329 fps | 96.5% |
| Norma 201 | <<locked>> | 92% | 55,013 psi | 88% | 2369 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,506 psi | 89% | 2372 fps | 100% |
| Norma 203B | <<locked>> | 94% | 52,968 psi | 85% | 2395 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 46,282 psi | 74% | 2349 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 94% | 53,345 psi | 86% | 2421 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,658 psi | 73% | 2343 fps | 96.4% |
| Ramshot TAC | <<locked>> | 90% | 56,028 psi | 90% | 2395 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,376 psi | 89% | 2415 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,621 psi | 86% | 2343 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,273 psi | 57% | 1434 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,463 psi | 89% | 2365 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,405 psi | 89% | 2395 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,896 psi | 86% | 2464 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,301 psi | 85% | 2493 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,948 psi | 74% | 2372 fps | 98.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,369 psi | 76% | 2395 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 90% | 56,101 psi | 90% | 2352 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,622 psi | 89% | 2369 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 2434 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 2369 fps | 96.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,880 psi | 83% | 2349 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,608 psi | 89% | 2398 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,057 psi | 90% | 2395 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,008 psi | 79% | 2329 fps | 96.5% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,230 psi | 89% | 2339 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,766 psi | 88% | 2362 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,694 psi | 88% | 2444 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,969 psi | 88% | 2310 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,273 psi | 87% | 2375 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,766 psi | 88% | 2395 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,925 psi | 86% | 2280 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,301 psi | 85% | 2277 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 2306 fps | 96.7% |
| Somchem S321 | <<locked>> | 86% | 53,476 psi | 86% | 2369 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,188 psi | 90% | 2316 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,505 psi | 86% | 2369 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 53,621 psi | 86% | 2392 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,292 psi | 66% | 2306 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 86% | 53,853 psi | 86% | 2251 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,867 psi | 86% | 2267 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,505 psi | 87% | 2336 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,941 psi | 90% | 2356 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2375 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,892 psi | 78% | 2349 fps | 98.6% |
| Vihtavuori N530 | <<locked>> | 90% | 56,202 psi | 90% | 2375 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,896 psi | 86% | 2356 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,964 psi | 77% | 2356 fps | 98.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,548 psi | 55% | 2198 fps | 96.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,835 psi | 80% | 2339 fps | 99.8% |
| Winchester 748 | <<locked>> | 90% | 55,376 psi | 89% | 2418 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 49,995 psi | 80% | 2398 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,186 psi | 87% | 2402 fps | 100% |
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 42,424 psi | 68% | 2142 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,818 psi | 73% | 2231 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,838 psi | 56% | 2077 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,075 psi | 66% | 2195 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 48,820 psi | 78% | 2257 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 32,982 psi | 53% | 2067 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 35,288 psi | 57% | 2169 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 50,850 psi | 82% | 2208 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,213 psi | 82% | 2228 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,798 psi | 62% | 2156 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 33,185 psi | 53% | 2034 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 50,865 psi | 82% | 2306 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,828 psi | 65% | 2169 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 39,943 psi | 64% | 2162 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,311 psi | 76% | 2333 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 34,983 psi | 56% | 2169 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,155 psi | 52% | 2051 fps | 97.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,819 psi | 77% | 2218 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,722 psi | 56% | 2100 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 90% | 34,374 psi | 55% | 2136 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 82% | 29,704 psi | 48% | 2057 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,792 psi | 49% | 2090 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,429 psi | 79% | 2205 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,565 psi | 60% | 2156 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 31,531 psi | 51% | 2051 fps | 97% |
| Bofors RP7 | <<locked>> | 96% | 48,109 psi | 77% | 2287 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,989 psi | 69% | 2162 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,986 psi | 63% | 2185 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,612 psi | 68% | 2293 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 46,673 psi | 75% | 2251 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,166 psi | 76% | 2270 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 37,173 psi | 60% | 2142 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 43,932 psi | 70% | 2306 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 98% | 51,532 psi | 83% | 2369 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 39,102 psi | 63% | 2169 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 29,356 psi | 47% | 2005 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,012 psi | 56% | 2139 fps | 98% |
| Hodgdon Superformance | <<locked>> | 98% | 47,776 psi | 77% | 2375 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,005 psi | 42% | 1250 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,724 psi | 60% | 2129 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 38,203 psi | 61% | 2169 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,780 psi | 56% | 2060 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,860 psi | 72% | 2208 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 48,675 psi | 78% | 2188 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,934 psi | 75% | 2267 fps | 95.5% |
| IMR 4831 | <<locked>> | 92% | 34,447 psi | 55% | 2136 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 35,534 psi | 57% | 2126 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,828 psi | 65% | 2169 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 45,687 psi | 73% | 2238 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,217 psi | 60% | 2142 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 39,653 psi | 64% | 2110 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 34,519 psi | 55% | 2067 fps | 98.1% |
| Lovex S065 | <<locked>> | 92% | 40,625 psi | 65% | 2178 fps | 95.6% |
| Lovex S070 | <<locked>> | 96% | 43,279 psi | 69% | 2244 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,116 psi | 61% | 2119 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 38,101 psi | 61% | 2133 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,127 psi | 55% | 2090 fps | 96.7% |
| Norma URP | <<locked>> | 92% | 36,042 psi | 58% | 2172 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 33,576 psi | 54% | 2100 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 98% | 42,830 psi | 69% | 2293 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 40,596 psi | 65% | 2165 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,740 psi | 64% | 2185 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,222 psi | 71% | 2208 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,063 psi | 42% | 1276 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,977 psi | 74% | 2241 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,902 psi | 69% | 2215 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,810 psi | 57% | 2178 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,689 psi | 48% | 2067 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 35,346 psi | 57% | 2185 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 38,827 psi | 62% | 2241 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 41,930 psi | 67% | 2159 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,318 psi | 58% | 2083 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 29,704 psi | 48% | 2005 fps | 96% |
| Rottweil R 907 | <<locked>> | 96% | 48,109 psi | 77% | 2287 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,625 psi | 65% | 2178 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,217 psi | 60% | 2142 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 34,519 psi | 55% | 2067 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 96% | 43,279 psi | 69% | 2244 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,472 psi | 78% | 2254 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,126 psi | 82% | 2316 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,806 psi | 49% | 2044 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,617 psi | 78% | 2234 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,624 psi | 62% | 2142 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,362 psi | 60% | 2133 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,755 psi | 64% | 2087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,677 psi | 52% | 1978 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,614 psi | 73% | 2221 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 43,627 psi | 70% | 2231 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 39,276 psi | 63% | 2093 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,261 psi | 61% | 2142 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 30,763 psi | 49% | 2011 fps | 96.1% |
| Somchem S365 | <<locked>> | 86% | 26,861 psi | 43% | 1998 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 45,049 psi | 72% | 2142 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,900 psi | 64% | 2087 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,259 psi | 57% | 2073 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,187 psi | 58% | 2080 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,225 psi | 47% | 1965 fps | 97% |
| Vihtavuori N160 | <<locked>> | 90% | 35,592 psi | 57% | 2129 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 40,799 psi | 65% | 2165 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,592 psi | 55% | 2070 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 34,838 psi | 56% | 2136 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 32,358 psi | 52% | 2152 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,747 psi | 48% | 1982 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 39,711 psi | 64% | 2198 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 44,164 psi | 71% | 2310 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,434 psi | 58% | 2133 fps | 97.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 106 powders for 8.5 x 63 loaded with the .338 | 250gr | Berger Hybrid OTM Tactical. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,520 fps; across all powders the maximum-charge window runs from 1,398 fps to 2,520 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 1:11.5 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.