Load Specifications
Load data in caliber 8 x 64 S with .323 | 220gr | Peregrine Brass Backup (VRG-2) bullet and 97 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.
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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% | 50,981 psi | 87% | 2346 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 52,286 psi | 89% | 2411 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 51,750 psi | 88% | 2405 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,792 psi | 86% | 2425 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 52,185 psi | 89% | 2408 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 51,851 psi | 88% | 2448 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,097 psi | 87% | 2516 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 50,140 psi | 85% | 2434 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 51,184 psi | 87% | 2434 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 52,663 psi | 90% | 2438 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,069 psi | 90% | 2415 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 52,808 psi | 90% | 2585 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 50,473 psi | 86% | 2451 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 51,372 psi | 87% | 2470 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,053 psi | 85% | 2523 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 96% | 50,821 psi | 87% | 2556 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,128 psi | 60% | 2283 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,798 psi | 66% | 2411 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 52,939 psi | 90% | 2493 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 50,676 psi | 86% | 2464 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 51,547 psi | 88% | 2438 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 51,372 psi | 87% | 2382 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 51,242 psi | 87% | 2461 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 49,603 psi | 84% | 2497 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 92% | 51,866 psi | 88% | 2474 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 98% | 51,024 psi | 87% | 2516 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 96% | 52,373 psi | 89% | 2484 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 86% | 50,589 psi | 86% | 2441 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,977 psi | 78% | 2411 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 52,997 psi | 90% | 2520 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 51,837 psi | 88% | 2546 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 60% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 51,837 psi | 88% | 2444 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 50,183 psi | 85% | 2428 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 50,560 psi | 86% | 2418 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 50,778 psi | 86% | 2398 fps | 97.1% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,387 psi | 87% | 2457 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,285 psi | 86% | 2418 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,704 psi | 83% | 2464 fps | 99.2% |
| IMR 4895 | <<locked>> | 90% | 52,678 psi | 90% | 2500 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 52,663 psi | 90% | 2438 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 52,417 psi | 89% | 2425 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 52,417 psi | 89% | 2454 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 50,212 psi | 85% | 2372 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 50,067 psi | 85% | 2415 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 52,504 psi | 89% | 2461 fps | 98.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,939 psi | 90% | 2487 fps | 97.8% |
| Norma 201 | <<locked>> | 88% | 51,880 psi | 88% | 2428 fps | 100% |
| Norma 202 | <<locked>> | 88% | 52,591 psi | 90% | 2434 fps | 100% |
| Norma 203B | <<locked>> | 90% | 50,560 psi | 86% | 2461 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,633 psi | 86% | 2507 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 90% | 50,778 psi | 86% | 2484 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,690 psi | 85% | 2503 fps | 97.9% |
| Ramshot TAC | <<locked>> | 86% | 52,939 psi | 90% | 2457 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,185 psi | 89% | 2470 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 50,096 psi | 85% | 2392 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 60% | 1512 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 52,214 psi | 89% | 2421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 52,649 psi | 90% | 2461 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 51,169 psi | 87% | 2523 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 50,894 psi | 87% | 2562 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,705 psi | 86% | 2536 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,387 psi | 87% | 2562 fps | 99% |
| Rottweil R 901 | <<locked>> | 86% | 52,837 psi | 90% | 2411 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 52,417 psi | 89% | 2428 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 50,560 psi | 86% | 2454 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 51,547 psi | 88% | 2438 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 52,504 psi | 89% | 2461 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 52,417 psi | 89% | 2454 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 50,067 psi | 85% | 2415 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,939 psi | 90% | 2487 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 52,402 psi | 89% | 2513 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 50,850 psi | 87% | 2431 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 51,634 psi | 88% | 2454 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 50,662 psi | 86% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 50,546 psi | 86% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 52,707 psi | 90% | 2415 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 50,053 psi | 85% | 2421 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,011 psi | 90% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 50,720 psi | 86% | 2428 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 51,097 psi | 87% | 2454 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,121 psi | 77% | 2464 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 50,807 psi | 86% | 2306 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 50,908 psi | 87% | 2326 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 51,996 psi | 89% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 52,982 psi | 90% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 52,707 psi | 90% | 2441 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 49,908 psi | 85% | 2457 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 53,011 psi | 90% | 2438 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 51,053 psi | 87% | 2411 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,257 psi | 89% | 2513 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,884 psi | 64% | 2352 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 50,560 psi | 86% | 2448 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 52,620 psi | 90% | 2480 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 51,358 psi | 87% | 2520 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,256 psi | 53% | 2264 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 88% | 51,445 psi | 88% | 2464 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% | 44,933 psi | 76% | 2267 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,008 psi | 83% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,173 psi | 63% | 2195 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,208 psi | 75% | 2333 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,672 psi | 78% | 2310 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,215 psi | 60% | 2192 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 33,533 psi | 57% | 2218 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 41,365 psi | 70% | 2293 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 35,157 psi | 60% | 2162 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,482 psi | 74% | 2303 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 43,308 psi | 74% | 2290 fps | 100% |
| Alliant Power Pro 2000-MR | 46.5 gr | 80% | 37,478 psi | 64% | 2316 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,461 psi | 59% | 2182 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,130 psi | 63% | 2234 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,503 psi | 55% | 2185 fps | 95% |
| Alliant Reloder-17 | 45.7 gr | 80% | 29,544 psi | 50% | 2142 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,196 psi | 50% | 2139 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,114 psi | 61% | 2352 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,364 psi | 69% | 2297 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 33,794 psi | 58% | 2182 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 45,281 psi | 77% | 2339 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,556 psi | 78% | 2297 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,930 psi | 71% | 2323 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,412 psi | 79% | 2448 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 34,911 psi | 59% | 2185 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 41,959 psi | 71% | 2369 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 94% | 49,139 psi | 84% | 2438 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 41,698 psi | 71% | 2303 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,573 psi | 50% | 2096 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,724 psi | 64% | 2280 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 44,904 psi | 76% | 2434 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 44% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,248 psi | 69% | 2264 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 41,031 psi | 70% | 2297 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,883 psi | 63% | 2192 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,032 psi | 72% | 2257 fps | 95% |
| IMR 4350 | <<locked>> | 96% | 45,469 psi | 77% | 2365 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,599 psi | 76% | 2329 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 32,721 psi | 56% | 2182 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 38,000 psi | 65% | 2260 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 43,482 psi | 74% | 2303 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,834 psi | 83% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,871 psi | 68% | 2274 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,800 psi | 71% | 2241 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 36,564 psi | 62% | 2195 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 38,392 psi | 65% | 2231 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 41,191 psi | 70% | 2300 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,509 psi | 69% | 2254 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 40,727 psi | 69% | 2260 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,492 psi | 62% | 2224 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 34,374 psi | 59% | 2224 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 36,056 psi | 61% | 2238 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 40,828 psi | 70% | 2356 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 43,236 psi | 74% | 2306 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,641 psi | 73% | 2326 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,094 psi | 80% | 2349 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,324 psi | 45% | 1352 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,950 psi | 83% | 2375 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,379 psi | 69% | 2267 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,609 psi | 66% | 2320 fps | 97.9% |
| ReloadSwiss RS 60 | 45.7 gr | 80% | 31,531 psi | 54% | 2201 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,576 psi | 57% | 2234 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 36,579 psi | 62% | 2293 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 44,092 psi | 75% | 2287 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,537 psi | 66% | 2211 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,662 psi | 54% | 2129 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 45,281 psi | 77% | 2339 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,392 psi | 65% | 2231 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,871 psi | 68% | 2274 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,564 psi | 62% | 2195 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 41,191 psi | 70% | 2300 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,837 psi | 56% | 2175 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,365 psi | 70% | 2280 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,813 psi | 68% | 2267 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,989 psi | 71% | 2211 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,664 psi | 59% | 2096 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,323 psi | 74% | 2280 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 46,702 psi | 80% | 2372 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,640 psi | 71% | 2218 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,089 psi | 70% | 2280 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 32,851 psi | 56% | 2139 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 25,164 psi | 43% | 2031 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 47,601 psi | 81% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,308 psi | 72% | 2208 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,666 psi | 64% | 2195 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,435 psi | 65% | 2205 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,038 psi | 53% | 2083 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 33,721 psi | 57% | 2178 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 43,482 psi | 74% | 2300 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 37,072 psi | 63% | 2198 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,128 psi | 60% | 2224 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 30,937 psi | 53% | 2201 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,631 psi | 50% | 2067 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 42,960 psi | 73% | 2343 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 41,959 psi | 71% | 2369 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,327 psi | 50% | 2208 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,233 psi | 67% | 2270 fps | 98.9% |
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 97 powders for 8 x 64 S loaded with the .323 | 220gr | Peregrine Brass Backup (VRG-2). Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,585 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,585 fps. Accurate 4350 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for 8 x 64 S with the .323 | 220gr | Peregrine Brass Backup (VRG-2) 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.