Load Specifications
Bullet:.366 | 285gr | Lapua Mega
Bullet Manufacturer:Lapua
Bullet Weight:285 gr
Bullet Diameter:0.366"
Bullet Length:<<locked>>
Caliber:9.3 x 66 Sako load data
Case Length (l3):2.59"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:60,191 psi
Recommended Twist Rate:1:6.0
Load data in caliber 9.3 x 66 Sako with .366 | 285gr | Lapua Mega bullet and 101 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 ReloadSwiss RS 52.
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>> | 88% | 54,128 psi | 90% | 2326 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 52,620 psi | 87% | 2352 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 51,474 psi | 86% | 2343 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 54,143 psi | 90% | 2405 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 52,228 psi | 87% | 2336 fps | 95.7% |
| Accurate 4064 | <<locked>> | 94% | 51,213 psi | 85% | 2382 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,528 psi | 77% | 2388 fps | 98.4% |
| Accurate LT-30 | <<locked>> | 82% | 54,012 psi | 90% | 2280 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 53,127 psi | 88% | 2411 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 53,911 psi | 90% | 2405 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 52,373 psi | 87% | 2372 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 52,185 psi | 87% | 2349 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,954 psi | 90% | 2457 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 52,083 psi | 87% | 2503 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 53,243 psi | 88% | 2425 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,070 psi | 90% | 2329 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 54,027 psi | 90% | 2444 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,528 psi | 77% | 2398 fps | 98.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,548 psi | 89% | 2526 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,692 psi | 54% | 2162 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 52,881 psi | 88% | 2280 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 52,562 psi | 87% | 2425 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 53,374 psi | 89% | 2438 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,273 psi | 90% | 2402 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 51,561 psi | 86% | 2320 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 51,140 psi | 85% | 2398 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 52,779 psi | 88% | 2480 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 84% | 53,200 psi | 88% | 2369 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,201 psi | 90% | 2395 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 51,547 psi | 86% | 2402 fps | 98.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 50,038 psi | 83% | 2434 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 90% | 53,563 psi | 89% | 2421 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,467 psi | 71% | 2293 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 51,938 psi | 86% | 2444 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 58% | 1421 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 51,590 psi | 86% | 2379 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 52,881 psi | 88% | 2405 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,519 psi | 89% | 2392 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,172 psi | 90% | 2375 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 51,416 psi | 85% | 2257 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 53,185 psi | 88% | 2392 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,527 psi | 74% | 2343 fps | 98.1% |
| IMR 4895 | <<locked>> | 92% | 52,141 psi | 87% | 2428 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 52,373 psi | 87% | 2372 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 52,460 psi | 87% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 52,011 psi | 86% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,490 psi | 89% | 2352 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 52,895 psi | 88% | 2388 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,822 psi | 86% | 2382 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,168 psi | 82% | 2365 fps | 96.4% |
| Norma 201 | <<locked>> | 90% | 52,011 psi | 86% | 2365 fps | 100% |
| Norma 202 | <<locked>> | 90% | 52,315 psi | 87% | 2369 fps | 100% |
| Norma 203B | <<locked>> | 94% | 53,127 psi | 88% | 2431 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 46,514 psi | 77% | 2385 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 94% | 53,490 psi | 89% | 2457 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,774 psi | 76% | 2375 fps | 96.3% |
| Ramshot TAC | <<locked>> | 88% | 52,881 psi | 88% | 2385 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 51,808 psi | 86% | 2402 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,505 psi | 89% | 2372 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,186 psi | 58% | 1457 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 52,272 psi | 87% | 2359 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 52,199 psi | 87% | 2388 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 54,085 psi | 90% | 2503 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,592 psi | 89% | 2533 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,224 psi | 77% | 2408 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,413 psi | 79% | 2428 fps | 97.6% |
| Rottweil R 901 | <<locked>> | 88% | 53,243 psi | 88% | 2352 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 52,344 psi | 87% | 2362 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 53,243 psi | 88% | 2428 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,273 psi | 90% | 2402 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,822 psi | 86% | 2382 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 52,011 psi | 86% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 52,895 psi | 88% | 2388 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,168 psi | 82% | 2365 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 51,793 psi | 86% | 2329 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 51,430 psi | 85% | 2438 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 51,938 psi | 86% | 2310 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,273 psi | 90% | 2408 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 51,547 psi | 86% | 2388 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,027 psi | 90% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,577 psi | 89% | 2313 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,243 psi | 87% | 2343 fps | 96.6% |
| Somchem S321 | <<locked>> | 86% | 53,447 psi | 89% | 2402 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 53,171 psi | 88% | 2316 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,693 psi | 89% | 2405 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 53,882 psi | 90% | 2428 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,553 psi | 69% | 2343 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 86% | 54,172 psi | 90% | 2287 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,998 psi | 90% | 2303 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 51,401 psi | 85% | 2333 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 52,576 psi | 87% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 52,040 psi | 86% | 2372 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,095 psi | 82% | 2382 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 88% | 52,779 psi | 88% | 2369 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 54,085 psi | 90% | 2388 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,153 psi | 80% | 2392 fps | 98.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,664 psi | 58% | 2231 fps | 96.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,154 psi | 83% | 2375 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 51,953 psi | 86% | 2411 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,299 psi | 84% | 2438 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,389 psi | 90% | 2438 fps | 100% |
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% | 42,424 psi | 70% | 2175 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,992 psi | 76% | 2264 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,925 psi | 58% | 2106 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,307 psi | 69% | 2231 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 48,950 psi | 81% | 2290 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 33,025 psi | 55% | 2096 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 35,418 psi | 59% | 2201 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 50,937 psi | 85% | 2241 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,914 psi | 65% | 2188 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 33,156 psi | 55% | 2064 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,930 psi | 68% | 2198 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 40,219 psi | 67% | 2198 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,398 psi | 79% | 2365 fps | 99.6% |
| Alliant Power Pro 2000-MR | 53.6 gr | 80% | 35,041 psi | 58% | 2198 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,300 psi | 54% | 2080 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,066 psi | 80% | 2254 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,853 psi | 58% | 2133 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,622 psi | 61% | 2215 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,734 psi | 53% | 2136 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,908 psi | 51% | 2119 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,545 psi | 82% | 2241 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,652 psi | 63% | 2185 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 31,633 psi | 53% | 2080 fps | 96.9% |
| Bofors RP7 | <<locked>> | 96% | 48,153 psi | 80% | 2316 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,091 psi | 72% | 2195 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,030 psi | 65% | 2215 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,917 psi | 71% | 2329 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 46,818 psi | 78% | 2287 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,398 psi | 79% | 2306 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 37,289 psi | 62% | 2175 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 96% | 44,179 psi | 73% | 2343 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,175 psi | 65% | 2198 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,372 psi | 52% | 2080 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,172 psi | 58% | 2172 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,005 psi | 43% | 1270 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,869 psi | 63% | 2162 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 38,218 psi | 63% | 2198 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,751 psi | 58% | 2090 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,034 psi | 75% | 2241 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 48,588 psi | 81% | 2221 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,108 psi | 78% | 2303 fps | 95.4% |
| IMR 4831 | <<locked>> | 92% | 34,490 psi | 57% | 2165 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 35,592 psi | 59% | 2156 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 40,930 psi | 68% | 2198 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 45,832 psi | 76% | 2274 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 37,231 psi | 62% | 2172 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 39,581 psi | 66% | 2139 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 34,432 psi | 57% | 2096 fps | 98% |
| Lovex S065 | <<locked>> | 92% | 40,741 psi | 68% | 2211 fps | 95.5% |
| Lovex S070 | <<locked>> | 96% | 43,482 psi | 72% | 2277 fps | 95% |
| Norma 201 | <<locked>> | 80% | 38,203 psi | 63% | 2152 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 38,290 psi | 64% | 2165 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,243 psi | 57% | 2123 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 36,129 psi | 60% | 2201 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 33,620 psi | 56% | 2129 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 98% | 42,960 psi | 71% | 2326 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 40,857 psi | 68% | 2201 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,943 psi | 66% | 2218 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,237 psi | 73% | 2241 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,179 psi | 43% | 1299 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,919 psi | 76% | 2270 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 43,178 psi | 72% | 2251 fps | 95.3% |
| ReloadSwiss RS 52 | 52 gr | 80% | 35,969 psi | 60% | 2211 fps | 96.6% |
| ReloadSwiss RS 60 | 52.8 gr | 80% | 29,776 psi | 49% | 2096 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 35,404 psi | 59% | 2215 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 38,914 psi | 65% | 2274 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 42,047 psi | 70% | 2192 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,376 psi | 60% | 2113 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 29,805 psi | 50% | 2034 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 96% | 48,153 psi | 80% | 2316 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,741 psi | 68% | 2211 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,231 psi | 62% | 2172 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 34,432 psi | 57% | 2096 fps | 98% |
| Shooters World SW4350 | <<locked>> | 96% | 43,482 psi | 72% | 2277 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,515 psi | 81% | 2287 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,980 psi | 51% | 2073 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,834 psi | 81% | 2270 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,783 psi | 64% | 2172 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,536 psi | 62% | 2165 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,943 psi | 66% | 2123 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,822 psi | 55% | 2011 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,716 psi | 76% | 2254 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 43,729 psi | 73% | 2264 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 39,291 psi | 65% | 2123 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,392 psi | 64% | 2172 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 30,835 psi | 51% | 2041 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 26,818 psi | 45% | 2021 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 45,237 psi | 75% | 2175 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,059 psi | 67% | 2119 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,404 psi | 59% | 2106 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,230 psi | 60% | 2110 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,254 psi | 49% | 1991 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 35,708 psi | 59% | 2159 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 40,930 psi | 68% | 2198 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 34,708 psi | 58% | 2100 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 92% | 37,101 psi | 62% | 2208 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 98% | 32,489 psi | 54% | 2182 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,921 psi | 50% | 2011 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 39,900 psi | 66% | 2234 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 44,179 psi | 73% | 2343 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,680 psi | 61% | 2165 fps | 97.9% |
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 101 powders for 9.3 x 66 Sako loaded with the .366 | 285gr | Lapua Mega. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,421 fps to 2,533 fps. Accurate 4350 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 285.0 gr projectile in 0.366" calls for a 1:6.0 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, ReloadSwiss RS 52 rank at the top here: for 9.3 x 66 Sako with the .366 | 285gr | Lapua Mega 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.