Load Specifications
Bullet Manufacturer:Rhino Bullets
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:1:13.0
Load data in caliber 8.5 x 63 with .338 | 250gr | Rhino Penetrator bullet and 106 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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 55,274 psi | 89% | 2313 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,679 psi | 86% | 2339 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,159 psi | 90% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,332 psi | 89% | 2395 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,171 psi | 85% | 2329 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 55,970 psi | 90% | 2411 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,921 psi | 77% | 2385 fps | 98.8% |
| Accurate LT-30 | <<locked>> | 82% | 54,882 psi | 88% | 2264 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,303 psi | 89% | 2287 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,273 psi | 87% | 2402 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 55,071 psi | 88% | 2398 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 55,637 psi | 89% | 2372 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,548 psi | 86% | 2362 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,403 psi | 86% | 2336 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,114 psi | 88% | 2448 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,388 psi | 86% | 2497 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,520 psi | 87% | 2415 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,085 psi | 88% | 2313 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,143 psi | 88% | 2434 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,514 psi | 76% | 2392 fps | 98.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2516 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,518 psi | 54% | 2162 fps | 96.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,780 psi | 86% | 2267 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,795 psi | 86% | 2415 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 54,839 psi | 88% | 2431 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2398 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,738 psi | 89% | 2349 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,608 psi | 89% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,998 psi | 87% | 2470 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 54,346 psi | 87% | 2356 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,100 psi | 88% | 2379 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,130 psi | 90% | 2438 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,387 psi | 82% | 2431 fps | 97% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 2444 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 90% | 54,810 psi | 88% | 2411 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,497 psi | 70% | 2287 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,359 psi | 86% | 2438 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 52,620 psi | 84% | 2461 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,085 psi | 56% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,101 psi | 90% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,085 psi | 87% | 2392 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,505 psi | 87% | 2382 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,129 psi | 88% | 2365 fps | 97.5% |
| IMR 4198 | <<locked>> | 84% | 55,492 psi | 89% | 2277 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,360 psi | 87% | 2385 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,600 psi | 73% | 2336 fps | 98.5% |
| IMR 4895 | <<locked>> | 92% | 53,040 psi | 85% | 2415 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 53,548 psi | 86% | 2362 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,432 psi | 86% | 2349 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,127 psi | 85% | 2379 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,259 psi | 87% | 2339 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 53,940 psi | 86% | 2379 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2375 fps | 98.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,328 psi | 81% | 2359 fps | 96.9% |
| Norma 201 | <<locked>> | 92% | 56,405 psi | 90% | 2395 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,447 psi | 86% | 2359 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,288 psi | 87% | 2425 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 47,703 psi | 76% | 2379 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 94% | 54,795 psi | 88% | 2451 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,804 psi | 75% | 2369 fps | 96.9% |
| Ramshot TAC | <<locked>> | 88% | 53,795 psi | 86% | 2375 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 52,866 psi | 85% | 2392 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,491 psi | 87% | 2362 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,302 psi | 57% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,185 psi | 85% | 2346 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,403 psi | 86% | 2382 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,434 psi | 89% | 2493 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,752 psi | 88% | 2520 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2405 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,414 psi | 78% | 2421 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 88% | 54,215 psi | 87% | 2339 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,519 psi | 86% | 2352 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,404 psi | 87% | 2418 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2398 fps | 97% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2375 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,127 psi | 85% | 2379 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,940 psi | 86% | 2379 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,328 psi | 81% | 2359 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 52,808 psi | 85% | 2320 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,956 psi | 90% | 2382 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,217 psi | 90% | 2474 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,072 psi | 90% | 2333 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,448 psi | 89% | 2402 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,985 psi | 90% | 2421 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,056 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,665 psi | 88% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2336 fps | 97.1% |
| Somchem S321 | <<locked>> | 86% | 54,462 psi | 87% | 2392 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,070 psi | 87% | 2303 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,984 psi | 88% | 2395 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 54,911 psi | 88% | 2415 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,540 psi | 68% | 2336 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 55,100 psi | 88% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,071 psi | 88% | 2290 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,072 psi | 90% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,751 psi | 86% | 2339 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,113 psi | 85% | 2359 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,343 psi | 81% | 2379 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 88% | 53,983 psi | 87% | 2359 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,158 psi | 88% | 2375 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,298 psi | 79% | 2385 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,491 psi | 57% | 2224 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,155 psi | 82% | 2365 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 53,229 psi | 85% | 2402 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,634 psi | 83% | 2434 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,796 psi | 89% | 2431 fps | 100% |
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% | 43,439 psi | 70% | 2165 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,007 psi | 75% | 2254 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,810 psi | 57% | 2096 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,177 psi | 68% | 2221 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,922 psi | 80% | 2283 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 33,895 psi | 54% | 2090 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,040 psi | 55% | 2152 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 51,459 psi | 83% | 2224 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,880 psi | 83% | 2244 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,668 psi | 64% | 2182 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 33,953 psi | 54% | 2057 fps | 95.9% |
| ADI AR 2219 | <<locked>> | 80% | 52,141 psi | 84% | 2329 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,655 psi | 67% | 2188 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 41,060 psi | 66% | 2182 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,356 psi | 78% | 2356 fps | 99.8% |
| Alliant Power Pro 2000-MR | 46.2 gr | 80% | 35,839 psi | 57% | 2195 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,996 psi | 53% | 2073 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,965 psi | 79% | 2241 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,563 psi | 57% | 2123 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,172 psi | 56% | 2165 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,429 psi | 49% | 2087 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,849 psi | 48% | 2073 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,415 psi | 81% | 2224 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,479 psi | 62% | 2178 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 32,343 psi | 52% | 2073 fps | 97.4% |
| Bofors RP7 | <<locked>> | 94% | 46,180 psi | 74% | 2267 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,816 psi | 70% | 2185 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,001 psi | 64% | 2211 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,932 psi | 70% | 2323 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 80% | 47,674 psi | 76% | 2274 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,298 psi | 77% | 2293 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 35,694 psi | 57% | 2123 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 96% | 45,179 psi | 72% | 2336 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 96% | 49,676 psi | 80% | 2356 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,943 psi | 64% | 2188 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,081 psi | 48% | 2031 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,926 psi | 58% | 2165 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 98% | 49,081 psi | 79% | 2408 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,991 psi | 42% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,508 psi | 62% | 2152 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 39,247 psi | 63% | 2192 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,592 psi | 57% | 2087 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,021 psi | 74% | 2234 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,574 psi | 79% | 2208 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,382 psi | 73% | 2254 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 33,069 psi | 53% | 2113 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 36,347 psi | 58% | 2149 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 41,655 psi | 67% | 2188 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 46,804 psi | 75% | 2260 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,319 psi | 61% | 2169 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,422 psi | 65% | 2133 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 35,346 psi | 57% | 2093 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 39,218 psi | 63% | 2162 fps | 95.4% |
| Lovex S070 | <<locked>> | 96% | 44,353 psi | 71% | 2270 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 38,986 psi | 63% | 2146 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 38,986 psi | 63% | 2152 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,940 psi | 56% | 2116 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 34,751 psi | 56% | 2152 fps | 95.5% |
| Ramshot Big Game | 46.2 gr | 80% | 34,447 psi | 55% | 2126 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 96% | 41,336 psi | 66% | 2277 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 41,481 psi | 67% | 2192 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,727 psi | 65% | 2211 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,194 psi | 72% | 2234 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 42% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,847 psi | 75% | 2260 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,394 psi | 66% | 2201 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,854 psi | 59% | 2208 fps | 97.1% |
| ReloadSwiss RS 60 | 45.5 gr | 80% | 30,458 psi | 49% | 2096 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,289 psi | 58% | 2211 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 39,842 psi | 64% | 2274 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 42,902 psi | 69% | 2182 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,173 psi | 60% | 2106 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 30,545 psi | 49% | 2031 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 46,180 psi | 74% | 2267 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,218 psi | 63% | 2162 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,319 psi | 61% | 2169 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,346 psi | 57% | 2093 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 96% | 44,353 psi | 71% | 2270 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,501 psi | 79% | 2277 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,286 psi | 84% | 2339 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,633 psi | 51% | 2070 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,763 psi | 80% | 2257 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,595 psi | 63% | 2165 fps | 96.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,319 psi | 61% | 2159 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,669 psi | 65% | 2110 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,489 psi | 54% | 2001 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 43,700 psi | 70% | 2201 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 44,643 psi | 72% | 2257 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 40,118 psi | 64% | 2113 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,218 psi | 63% | 2165 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 31,560 psi | 51% | 2037 fps | 96.5% |
| Somchem S365 | <<locked>> | 84% | 25,875 psi | 41% | 1975 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 46,035 psi | 74% | 2162 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,828 psi | 65% | 2106 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,216 psi | 58% | 2096 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,014 psi | 59% | 2103 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,950 psi | 48% | 1988 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 34,316 psi | 55% | 2113 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 41,640 psi | 67% | 2185 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 35,491 psi | 57% | 2093 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 35,621 psi | 57% | 2159 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 31,401 psi | 50% | 2136 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,516 psi | 49% | 2008 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 40,799 psi | 65% | 2224 fps | 99.8% |
| Winchester 760 | <<locked>> | 96% | 45,179 psi | 72% | 2336 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,391 psi | 60% | 2159 fps | 98.3% |
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 8.5 x 63 loaded with the .338 | 250gr | Rhino Penetrator. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,520 fps; across all powders the maximum-charge window runs from 1,411 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 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.0 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 8.5 x 63 with the .338 | 250gr | Rhino Penetrator 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.