Load Specifications
Load data in caliber 9.3 x 66 Sako with .366 | 286gr | Barnes Banded Solid RN bullet and 95 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 52 and Hodgdon CFE223.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 52,736 psi | 88% | 2267 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 52,968 psi | 88% | 2339 fps | 98.9% |
| Accurate 2230 | <<locked>> | 82% | 53,722 psi | 89% | 2352 fps | 99.2% |
| Accurate 2460 | <<locked>> | 86% | 51,082 psi | 85% | 2287 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 52,330 psi | 87% | 2316 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 52,098 psi | 87% | 2336 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 51,837 psi | 86% | 2346 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 40,857 psi | 68% | 2257 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 53,229 psi | 88% | 2221 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 53,693 psi | 89% | 2241 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 51,416 psi | 85% | 2339 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 98% | 52,315 psi | 87% | 2333 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 53,055 psi | 88% | 2323 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,215 psi | 90% | 2343 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 53,359 psi | 89% | 2326 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 52,257 psi | 87% | 2388 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 54,128 psi | 90% | 2474 fps | 99.2% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 54,157 psi | 90% | 2388 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 52,692 psi | 88% | 2270 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 52,112 psi | 87% | 2369 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,119 psi | 70% | 2267 fps | 96.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,225 psi | 80% | 2395 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 51,982 psi | 86% | 2224 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 54,157 psi | 90% | 2392 fps | 98.9% |
| Bofors RP3 | <<locked>> | 98% | 50,966 psi | 85% | 2359 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 90% | 53,476 psi | 89% | 2293 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 52,489 psi | 87% | 2372 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 54,375 psi | 90% | 2448 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 51,851 psi | 86% | 2306 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 52,707 psi | 88% | 2333 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 52,837 psi | 88% | 2369 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 92% | 51,822 psi | 86% | 2349 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,232 psi | 64% | 2172 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 53,214 psi | 88% | 2415 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,432 psi | 57% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 53,388 psi | 89% | 2352 fps | 99.7% |
| IMR 3031 | <<locked>> | 94% | 54,114 psi | 90% | 2379 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 51,851 psi | 86% | 2320 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,055 psi | 88% | 2300 fps | 95.9% |
| IMR 4198 | <<locked>> | 86% | 53,621 psi | 89% | 2238 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 39,508 psi | 66% | 2215 fps | 96.1% |
| IMR 4895 | <<locked>> | 96% | 53,330 psi | 89% | 2395 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 92% | 54,215 psi | 90% | 2343 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 88% | 54,404 psi | 90% | 2336 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 53,403 psi | 89% | 2362 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 52,257 psi | 87% | 2280 fps | 99.3% |
| Lovex S062 | <<locked>> | 98% | 54,186 psi | 90% | 2356 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 46,891 psi | 78% | 2260 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 52,692 psi | 88% | 2247 fps | 100% |
| Norma 201 | <<locked>> | 94% | 53,490 psi | 89% | 2336 fps | 99.9% |
| Norma 202 | <<locked>> | 94% | 53,751 psi | 89% | 2343 fps | 100% |
| Norma 203B | <<locked>> | 98% | 54,360 psi | 90% | 2398 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 41,785 psi | 69% | 2257 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 96% | 51,474 psi | 86% | 2379 fps | 99.2% |
| Ramshot TAC | <<locked>> | 90% | 51,488 psi | 86% | 2313 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 53,621 psi | 89% | 2375 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 52,330 psi | 87% | 2306 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,505 psi | 57% | 1404 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,128 psi | 90% | 2333 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 53,896 psi | 90% | 2352 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 51,474 psi | 86% | 2421 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 51,532 psi | 86% | 2451 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 41,104 psi | 68% | 2274 fps | 96% |
| Rottweil R 901 | <<locked>> | 90% | 51,547 psi | 86% | 2283 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 53,621 psi | 89% | 2329 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 50,821 psi | 84% | 2352 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 46,891 psi | 78% | 2260 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 94% | 53,403 psi | 89% | 2362 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,186 psi | 90% | 2356 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 54,360 psi | 90% | 2310 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,418 psi | 90% | 2014 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 53,316 psi | 89% | 2329 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 52,663 psi | 87% | 2402 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 53,896 psi | 90% | 2287 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 52,504 psi | 87% | 2333 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,040 psi | 88% | 2356 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 52,866 psi | 88% | 2254 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 51,880 psi | 86% | 2247 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 52,040 psi | 86% | 2336 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 51,677 psi | 86% | 2254 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 52,011 psi | 86% | 2333 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 51,517 psi | 86% | 2349 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,144 psi | 62% | 2215 fps | 98.5% |
| Vihtavuori N130 | <<locked>> | 88% | 52,765 psi | 88% | 2228 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 52,692 psi | 88% | 2244 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 52,359 psi | 87% | 2303 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 54,114 psi | 90% | 2323 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,995 psi | 83% | 2300 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,092 psi | 73% | 2257 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 90% | 51,343 psi | 85% | 2303 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 52,301 psi | 87% | 2323 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 42,844 psi | 71% | 2260 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 45,397 psi | 75% | 2251 fps | 98.8% |
| Winchester 748 | <<locked>> | 92% | 53,679 psi | 89% | 2385 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 52,591 psi | 87% | 2365 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 38,696 psi | 64% | 2080 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 49,748 psi | 83% | 2297 fps | 98.5% |
| Accurate 2230 | <<locked>> | 80% | 50,227 psi | 83% | 2306 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 41,843 psi | 70% | 2162 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,111 psi | 52% | 2005 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,130 psi | 62% | 2119 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 29,486 psi | 49% | 1988 fps | 98.6% |
| Accurate 4350 | <<locked>> | 98% | 37,971 psi | 63% | 2208 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 47,195 psi | 78% | 2146 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 47,572 psi | 79% | 2162 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 35,491 psi | 59% | 2080 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 36,463 psi | 61% | 2083 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 46,499 psi | 77% | 2241 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,478 psi | 62% | 2096 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 35,969 psi | 60% | 2100 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,018 psi | 71% | 2251 fps | 98.7% |
| Alliant Power Pro 2000-MR | 52.1 gr | 86% | 38,798 psi | 64% | 2224 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,138 psi | 48% | 1975 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 43,961 psi | 73% | 2159 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 35,853 psi | 60% | 2110 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 37,463 psi | 62% | 2178 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 32,692 psi | 54% | 2110 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,919 psi | 76% | 2149 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 36,637 psi | 61% | 2119 fps | 95.2% |
| Bofors RP3 | <<locked>> | 82% | 30,037 psi | 50% | 2011 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,653 psi | 66% | 2093 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,230 psi | 59% | 2106 fps | 98.1% |
| Hodgdon CFE223 | 49.6 gr | 80% | 38,638 psi | 64% | 2205 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 80% | 42,467 psi | 71% | 2182 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,047 psi | 72% | 2201 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 40,814 psi | 68% | 2192 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 35,694 psi | 59% | 2090 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 31,923 psi | 53% | 2044 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,763 psi | 53% | 2057 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,425 psi | 42% | 1224 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,577 psi | 57% | 2054 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 34,461 psi | 57% | 2100 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 33,852 psi | 56% | 2028 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 92% | 49,777 psi | 83% | 2254 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 44,933 psi | 75% | 2133 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 37,173 psi | 62% | 2172 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 32,213 psi | 54% | 2047 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 37,478 psi | 62% | 2096 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 41,481 psi | 69% | 2162 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 33,475 psi | 56% | 2064 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 36,622 psi | 61% | 2041 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 31,386 psi | 52% | 1991 fps | 96.4% |
| Lovex S065 | <<locked>> | 98% | 44,179 psi | 73% | 2221 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 49,617 psi | 82% | 2211 fps | 100% |
| Norma 201 | <<locked>> | 80% | 34,853 psi | 58% | 2047 fps | 97.5% |
| Norma 202 | <<locked>> | 80% | 34,809 psi | 58% | 2064 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 32,880 psi | 55% | 2054 fps | 95.4% |
| Norma URP | <<locked>> | 98% | 39,160 psi | 65% | 2211 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 84% | 34,737 psi | 58% | 2106 fps | 95.6% |
| Ramshot TAC | <<locked>> | 84% | 42,395 psi | 70% | 2178 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,158 psi | 60% | 2106 fps | 96.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 40,669 psi | 68% | 2133 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,599 psi | 43% | 1253 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,061 psi | 70% | 2169 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 47,355 psi | 79% | 2264 fps | 95.5% |
| ReloadSwiss RS 52 | 48.2 gr | 82% | 34,621 psi | 58% | 2139 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,050 psi | 45% | 1975 fps | 95.1% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 38,464 psi | 64% | 2224 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 38,450 psi | 64% | 2090 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 33,228 psi | 55% | 2008 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 30,313 psi | 50% | 2011 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 44,179 psi | 73% | 2221 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,475 psi | 56% | 2064 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 31,386 psi | 52% | 1991 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,483 psi | 74% | 2178 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,517 psi | 86% | 1985 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 46,847 psi | 78% | 2247 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 33,837 psi | 56% | 2093 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,643 psi | 74% | 2172 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,248 psi | 67% | 2152 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,055 psi | 57% | 2054 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,608 psi | 61% | 2021 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,849 psi | 50% | 1913 fps | 99% |
| Somchem S321 | <<locked>> | 80% | 39,914 psi | 66% | 2159 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 36,027 psi | 60% | 2028 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 34,838 psi | 58% | 2064 fps | 95.8% |
| Somchem S355 | <<locked>> | 84% | 31,488 psi | 52% | 2018 fps | 95.4% |
| Somchem S365 | <<locked>> | 92% | 28,964 psi | 48% | 2034 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 41,568 psi | 69% | 2087 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,622 psi | 61% | 2024 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,763 psi | 53% | 2005 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 32,779 psi | 54% | 2008 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 28,036 psi | 47% | 1926 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 96% | 38,856 psi | 65% | 2172 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 37,275 psi | 62% | 2090 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 31,502 psi | 52% | 1998 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 96% | 37,768 psi | 63% | 2175 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 32,953 psi | 55% | 2031 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 35,868 psi | 60% | 2119 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,083 psi | 55% | 2054 fps | 96.1% |
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 95 powders for 9.3 x 66 Sako loaded with the .366 | 286gr | Barnes Banded Solid RN. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,474 fps; across all powders the maximum-charge window runs from 1,375 fps to 2,474 fps. Accurate 4350 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 286.0 gr projectile in 0.366" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- TS 15.5, 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, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for 9.3 x 66 Sako with the .366 | 286gr | Barnes Banded Solid 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.