Load Specifications
Load data in caliber 8 x 65 RS with .323 | 220gr | Sierra GameKing bullet and 96 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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 52,692 psi | 90% | 2398 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 50,604 psi | 86% | 2418 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,807 psi | 86% | 2467 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,807 psi | 86% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 51,285 psi | 87% | 2425 fps | 96.9% |
| Accurate 4064 | <<locked>> | 90% | 50,647 psi | 86% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,676 psi | 85% | 2533 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 51,605 psi | 88% | 2493 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 52,518 psi | 89% | 2490 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 50,836 psi | 87% | 2448 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 51,184 psi | 87% | 2425 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 50,560 psi | 86% | 2592 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,301 psi | 89% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,895 psi | 90% | 2530 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,358 psi | 87% | 2582 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,243 psi | 89% | 2618 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,680 psi | 62% | 2356 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,466 psi | 69% | 2493 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 51,097 psi | 87% | 2507 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 52,388 psi | 89% | 2523 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,968 psi | 90% | 2497 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,692 psi | 90% | 2431 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,113 psi | 90% | 2520 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,068 psi | 87% | 2556 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 50,836 psi | 87% | 2431 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 50,386 psi | 86% | 2490 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 50,691 psi | 86% | 2552 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 51,909 psi | 88% | 2520 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 52,141 psi | 89% | 2500 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,703 psi | 81% | 2474 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 51,126 psi | 87% | 2533 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 49,835 psi | 85% | 2559 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,375 psi | 60% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 52,301 psi | 89% | 2487 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 50,256 psi | 86% | 2461 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 51,343 psi | 87% | 2464 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,923 psi | 87% | 2438 fps | 97.6% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,968 psi | 90% | 2520 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 51,822 psi | 88% | 2480 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,686 psi | 76% | 2444 fps | 99% |
| IMR 4895 | <<locked>> | 88% | 50,937 psi | 87% | 2513 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 50,836 psi | 87% | 2448 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 50,807 psi | 86% | 2467 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 51,503 psi | 88% | 2428 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 51,677 psi | 88% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 50,763 psi | 86% | 2474 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 51,517 psi | 88% | 2503 fps | 98% |
| Norma 201 | <<locked>> | 86% | 50,589 psi | 86% | 2444 fps | 100% |
| Norma 202 | <<locked>> | 86% | 50,836 psi | 87% | 2444 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,098 psi | 89% | 2520 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 52,489 psi | 89% | 2572 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 52,243 psi | 89% | 2543 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,401 psi | 88% | 2572 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 50,850 psi | 87% | 2464 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 50,125 psi | 85% | 2477 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,488 psi | 88% | 2448 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,665 psi | 61% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 50,821 psi | 87% | 2474 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,055 psi | 90% | 2589 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,286 psi | 89% | 2618 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,649 psi | 90% | 2602 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,721 psi | 90% | 2625 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 51,706 psi | 88% | 2425 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 50,807 psi | 86% | 2441 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,272 psi | 89% | 2513 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 52,968 psi | 90% | 2497 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 50,763 psi | 86% | 2474 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 50,807 psi | 86% | 2467 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,677 psi | 88% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 51,517 psi | 88% | 2503 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 50,575 psi | 86% | 2526 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,431 psi | 89% | 2490 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 49,879 psi | 85% | 2464 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 52,127 psi | 89% | 2385 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,924 psi | 88% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,082 psi | 87% | 2431 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 51,576 psi | 88% | 2477 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,619 psi | 88% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,170 psi | 89% | 2484 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 53,011 psi | 90% | 2516 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,905 psi | 80% | 2530 fps | 100% |
| Unknown powder | <<locked>> | 96% | 50,372 psi | 86% | 2533 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 82% | 51,213 psi | 87% | 2346 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 51,822 psi | 88% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 50,575 psi | 86% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 50,430 psi | 86% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 50,705 psi | 86% | 2451 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 50,908 psi | 87% | 2507 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 50,227 psi | 86% | 2448 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 50,169 psi | 85% | 2444 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 50,952 psi | 87% | 2549 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,537 psi | 67% | 2421 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,112 psi | 89% | 2507 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 51,111 psi | 87% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 50,691 psi | 86% | 2552 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,750 psi | 56% | 2356 fps | 98.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 46,601 psi | 79% | 2320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,073 psi | 67% | 2257 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,411 psi | 76% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,411 psi | 76% | 2379 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 45,063 psi | 77% | 2333 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 36,970 psi | 63% | 2254 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 30,719 psi | 52% | 2192 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 42,815 psi | 73% | 2356 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 36,434 psi | 62% | 2224 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,889 psi | 76% | 2359 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,962 psi | 77% | 2346 fps | 100% |
| Alliant Power Pro 2000-MR | 46.8 gr | 80% | 38,754 psi | 66% | 2385 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,926 psi | 61% | 2244 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,609 psi | 66% | 2300 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,676 psi | 54% | 2205 fps | 95.5% |
| Alliant Reloder-17 | 46 gr | 80% | 30,821 psi | 52% | 2215 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,151 psi | 46% | 2119 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 32,880 psi | 56% | 2323 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,713 psi | 71% | 2359 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 35,447 psi | 60% | 2247 fps | 98.9% |
| Bofors RP7 | <<locked>> | 90% | 44,150 psi | 75% | 2359 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,601 psi | 79% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,511 psi | 74% | 2382 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,892 psi | 82% | 2510 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 47,572 psi | 81% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,172 psi | 62% | 2247 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 88% | 41,597 psi | 71% | 2402 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 94% | 46,064 psi | 78% | 2428 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,178 psi | 74% | 2365 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,180 psi | 46% | 2070 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,666 psi | 62% | 2297 fps | 99.1% |
| Hodgdon Superformance | 56 gr | 92% | 43,410 psi | 74% | 2451 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 45% | 1339 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,522 psi | 66% | 2267 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 39,088 psi | 67% | 2297 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,839 psi | 61% | 2205 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 40,234 psi | 68% | 2260 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 43,961 psi | 75% | 2382 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 40,538 psi | 69% | 2297 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 30,777 psi | 52% | 2175 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,508 psi | 67% | 2326 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 44,889 psi | 76% | 2359 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 41,611 psi | 71% | 2336 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,047 psi | 73% | 2297 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 38,130 psi | 65% | 2257 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 35,389 psi | 60% | 2208 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 40,118 psi | 68% | 2320 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 41,887 psi | 71% | 2310 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,221 psi | 72% | 2320 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,971 psi | 65% | 2290 fps | 98.7% |
| Norma URP | <<locked>> | 84% | 31,459 psi | 54% | 2195 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 37,405 psi | 64% | 2303 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 37,275 psi | 63% | 2326 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,585 psi | 76% | 2365 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,034 psi | 75% | 2385 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,196 psi | 82% | 2402 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 45% | 1371 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,233 psi | 67% | 2280 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,147 psi | 68% | 2385 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,808 psi | 56% | 2274 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,677 psi | 56% | 2254 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,418 psi | 60% | 2313 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 45,948 psi | 78% | 2343 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,929 psi | 68% | 2270 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,257 psi | 57% | 2198 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 44,150 psi | 75% | 2359 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,389 psi | 60% | 2208 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,611 psi | 71% | 2336 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,130 psi | 65% | 2257 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 90% | 40,118 psi | 68% | 2320 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,214 psi | 58% | 2241 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,873 psi | 73% | 2343 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,191 psi | 70% | 2326 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,410 psi | 74% | 2267 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,013 psi | 61% | 2152 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 39,305 psi | 67% | 2247 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 48,211 psi | 82% | 2428 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,873 psi | 73% | 2267 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,467 psi | 72% | 2339 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 34,200 psi | 58% | 2205 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 24,874 psi | 42% | 2060 fps | 95.9% |
| Unknown powder | <<locked>> | 84% | 34,301 psi | 58% | 2247 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,066 psi | 82% | 2303 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,031 psi | 70% | 2221 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,276 psi | 67% | 2251 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,305 psi | 67% | 2254 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,225 psi | 50% | 2077 fps | 98% |
| Vihtavuori N160 | <<locked>> | 82% | 32,024 psi | 55% | 2175 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,094 psi | 80% | 2402 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,044 psi | 66% | 2274 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,445 psi | 55% | 2218 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 28,747 psi | 49% | 2185 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,863 psi | 49% | 2083 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 47,645 psi | 81% | 2448 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,597 psi | 71% | 2402 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,151 psi | 46% | 2185 fps | 95.3% |
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 115 powders for 8 x 65 RS loaded with the .323 | 220gr | Sierra GameKing. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,625 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 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 3100, ADI AR 2209, Alliant Reloder-16 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 x 65 RS with the .323 | 220gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.