Load Specifications
Bullet Manufacturer:A-Square
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
Load data in caliber 8.5 x 63 with .338 | 250gr | A-Square MONO RN bullet and 98 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, 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>> | 84% | 55,782 psi | 89% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,099 psi | 87% | 2392 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,941 psi | 90% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,200 psi | 85% | 2402 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,886 psi | 66% | 2316 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 54,317 psi | 87% | 2441 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,708 psi | 86% | 2520 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,621 psi | 88% | 2467 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,695 psi | 89% | 2467 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,577 psi | 86% | 2421 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,520 psi | 87% | 2395 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,954 psi | 87% | 2572 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,564 psi | 89% | 2487 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,173 psi | 90% | 2507 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2566 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,260 psi | 90% | 2602 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,320 psi | 63% | 2343 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,627 psi | 70% | 2484 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,302 psi | 87% | 2484 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 56,304 psi | 90% | 2503 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,115 psi | 90% | 2477 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,288 psi | 89% | 2402 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,939 psi | 85% | 2451 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,752 psi | 88% | 2536 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,519 psi | 86% | 2467 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 52,939 psi | 85% | 2516 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 94% | 53,751 psi | 86% | 2480 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 55,216 psi | 89% | 2474 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2454 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,505 psi | 87% | 2507 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,417 psi | 86% | 2549 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 52,953 psi | 85% | 2431 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,317 psi | 89% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,984 psi | 88% | 2451 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,100 psi | 88% | 2438 fps | 98.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2503 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,737 psi | 88% | 2461 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 2510 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 54,041 psi | 87% | 2487 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,577 psi | 86% | 2421 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,244 psi | 87% | 2441 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,157 psi | 87% | 2398 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,071 psi | 88% | 2448 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,954 psi | 87% | 2454 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 54,766 psi | 88% | 2487 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 53,388 psi | 86% | 2418 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,896 psi | 86% | 2418 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,376 psi | 89% | 2493 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,359 psi | 86% | 2500 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 43,859 psi | 70% | 2448 fps | 96.2% |
| Norma URPᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2552 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,956 psi | 90% | 2520 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2552 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 53,621 psi | 86% | 2441 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,272 psi | 85% | 2454 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,259 psi | 87% | 2421 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 58% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,998 psi | 87% | 2457 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,953 psi | 85% | 2516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,072 psi | 90% | 2595 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,142 psi | 85% | 2536 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 52,881 psi | 85% | 2562 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 54,505 psi | 87% | 2398 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,027 psi | 87% | 2418 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,188 psi | 90% | 2493 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,115 psi | 90% | 2477 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,954 psi | 87% | 2454 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,244 psi | 87% | 2441 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,071 psi | 88% | 2448 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,766 psi | 88% | 2487 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,056 psi | 87% | 2503 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,811 psi | 89% | 2470 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,347 psi | 90% | 2487 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,071 psi | 88% | 2362 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,013 psi | 88% | 2359 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,346 psi | 87% | 2415 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 54,723 psi | 88% | 2451 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,288 psi | 87% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,419 psi | 89% | 2461 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,231 psi | 90% | 2490 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,575 psi | 81% | 2507 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,036 psi | 75% | 2405 fps | 96.5% |
| Vihtavuori N130 | <<locked>> | 82% | 54,752 psi | 88% | 2323 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,332 psi | 89% | 2346 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,548 psi | 86% | 2382 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,273 psi | 87% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,389 psi | 87% | 2431 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,303 psi | 89% | 2503 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,070 psi | 87% | 2421 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,883 psi | 90% | 2441 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,172 psi | 87% | 2507 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,975 psi | 69% | 2408 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,579 psi | 89% | 2487 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,983 psi | 87% | 2464 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,185 psi | 85% | 2520 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,143 psi | 56% | 2352 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,260 psi | 90% | 2493 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% | 49,342 psi | 79% | 2293 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,829 psi | 67% | 2231 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,052 psi | 79% | 2365 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,845 psi | 70% | 2257 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 35,694 psi | 57% | 2218 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,595 psi | 63% | 2231 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,140 psi | 50% | 2133 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 45,237 psi | 73% | 2329 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,653 psi | 62% | 2205 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,326 psi | 76% | 2333 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,877 psi | 77% | 2313 fps | 100% |
| Alliant Power Pro 2000-MR | 53.3 gr | 80% | 41,191 psi | 66% | 2365 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,232 psi | 61% | 2221 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,959 psi | 66% | 2277 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,589 psi | 51% | 2142 fps | 95.6% |
| Alliant Reloder-17 | 52.5 gr | 80% | 32,982 psi | 53% | 2201 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,311 psi | 44% | 2064 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,315 psi | 53% | 2267 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,367 psi | 71% | 2336 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 37,942 psi | 61% | 2228 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 41,365 psi | 66% | 2247 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,168 psi | 79% | 2323 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,224 psi | 74% | 2356 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,242 psi | 82% | 2490 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 38,653 psi | 62% | 2231 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 88% | 40,828 psi | 65% | 2320 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 44,483 psi | 71% | 2339 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,687 psi | 73% | 2339 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,282 psi | 44% | 2011 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,814 psi | 67% | 2320 fps | 99.8% |
| Hodgdon Superformance | 62.4 gr | 90% | 43,192 psi | 69% | 2385 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 43% | 1316 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,961 psi | 70% | 2300 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 45,687 psi | 73% | 2329 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,596 psi | 65% | 2231 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,888 psi | 69% | 2247 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 41,408 psi | 66% | 2274 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,393 psi | 65% | 2231 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 30,385 psi | 49% | 2100 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 41,974 psi | 67% | 2303 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,326 psi | 76% | 2333 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,628 psi | 72% | 2313 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,368 psi | 73% | 2274 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,524 psi | 65% | 2234 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,433 psi | 57% | 2146 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 40,234 psi | 65% | 2257 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,338 psi | 71% | 2287 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,701 psi | 72% | 2290 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,350 psi | 65% | 2267 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 46,731 psi | 75% | 2398 fps | 95% |
| Norma MRP | <<locked>> | 98% | 41,075 psi | 66% | 2395 fps | 95.3% |
| Norma URP | <<locked>> | 82% | 31,531 psi | 51% | 2133 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,900 psi | 64% | 2280 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 37,304 psi | 60% | 2260 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 47,326 psi | 76% | 2349 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,862 psi | 75% | 2362 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,981 psi | 82% | 2379 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 43% | 1348 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,015 psi | 63% | 2215 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,308 psi | 69% | 2372 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,128 psi | 56% | 2257 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,127 psi | 53% | 2198 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,433 psi | 57% | 2251 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 48,385 psi | 78% | 2316 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,264 psi | 68% | 2244 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,737 psi | 57% | 2182 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 41,365 psi | 66% | 2247 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,433 psi | 57% | 2146 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,628 psi | 72% | 2313 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,524 psi | 65% | 2234 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 40,234 psi | 65% | 2257 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,637 psi | 59% | 2224 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,629 psi | 73% | 2326 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,859 psi | 70% | 2306 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,759 psi | 73% | 2241 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,116 psi | 61% | 2129 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,291 psi | 63% | 2185 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 51,097 psi | 82% | 2402 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,237 psi | 73% | 2241 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,223 psi | 73% | 2320 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 36,448 psi | 58% | 2182 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 26,585 psi | 43% | 2047 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 41,336 psi | 66% | 2313 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,576 psi | 83% | 2283 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,108 psi | 74% | 2231 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,843 psi | 67% | 2224 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,409 psi | 68% | 2238 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,722 psi | 56% | 2129 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 30,850 psi | 49% | 2087 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 47,543 psi | 76% | 2333 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,741 psi | 65% | 2231 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,401 psi | 52% | 2136 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 29,312 psi | 47% | 2133 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,618 psi | 49% | 2067 fps | 97.2% |
| Winchester 748 | <<locked>> | 80% | 47,311 psi | 76% | 2372 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,828 psi | 65% | 2320 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,282 psi | 44% | 2129 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,366 psi | 70% | 2313 fps | 99.7% |
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 98 powders for 8.5 x 63 loaded with the .338 | 250gr | A-Square MONO RN. Alliant Reloder-17 delivers the highest muzzle velocity at 2,602 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,602 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. Accurate 3100, 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8.5 x 63 with the .338 | 250gr | A-Square MONO RN 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.