Load Specifications
Load data in caliber 9.3 x 66 Sako with .366 | 255gr | Geco EXPRESS bullet and 90 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.
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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>> | 92% | 53,519 psi | 89% | 2441 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 54,462 psi | 90% | 2523 fps | 98.5% |
| Accurate 2230 | <<locked>> | 82% | 51,416 psi | 85% | 2484 fps | 98.3% |
| Accurate 2460 | <<locked>> | 88% | 51,924 psi | 86% | 2461 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 52,895 psi | 88% | 2490 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 50,937 psi | 85% | 2497 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 50,937 psi | 85% | 2497 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 52,475 psi | 87% | 2523 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 51,343 psi | 85% | 2359 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 51,721 psi | 86% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 52,417 psi | 87% | 2513 fps | 98.8% |
| ADI AR 2207 | <<locked>> | 82% | 52,547 psi | 87% | 2379 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 53,127 psi | 88% | 2503 fps | 98.3% |
| ADI AR 2219 | <<locked>> | 86% | 54,346 psi | 90% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 52,011 psi | 86% | 2477 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 94% | 54,244 psi | 90% | 2510 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 53,171 psi | 88% | 2569 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 51,764 psi | 86% | 2598 fps | 98% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 51,764 psi | 86% | 2523 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 88% | 53,722 psi | 89% | 2451 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 52,939 psi | 88% | 2539 fps | 98.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 45,876 psi | 76% | 2513 fps | 98.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 53,577 psi | 89% | 2395 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 53,258 psi | 88% | 2398 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 51,895 psi | 86% | 2523 fps | 97.9% |
| Bofors RP3ᴾ | <<locked>> | 100% | 51,953 psi | 86% | 2536 fps | 99.4% |
| Hodgdon Benchmark | <<locked>> | 90% | 51,503 psi | 86% | 2428 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 94% | 53,621 psi | 89% | 2549 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 51,909 psi | 86% | 2582 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 90% | 51,764 psi | 86% | 2474 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,476 psi | 89% | 2507 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 53,940 psi | 90% | 2543 fps | 97.5% |
| Hodgdon H4198 | <<locked>> | 84% | 53,084 psi | 88% | 2395 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 52,779 psi | 88% | 2523 fps | 99.3% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 53,940 psi | 90% | 2589 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,997 psi | 56% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 52,982 psi | 88% | 2507 fps | 99.2% |
| IMR 3031 | <<locked>> | 98% | 52,837 psi | 88% | 2536 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 51,750 psi | 86% | 2474 fps | 98.4% |
| IMR 4198 | <<locked>> | 86% | 51,590 psi | 86% | 2382 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 54,157 psi | 90% | 2572 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 92% | 52,011 psi | 86% | 2477 fps | 99.5% |
| Lovex D073.4 | <<locked>> | 82% | 51,938 psi | 86% | 2470 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 52,069 psi | 87% | 2470 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 96% | 54,375 psi | 90% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 53,417 psi | 89% | 2454 fps | 98.9% |
| Lovex S062 | <<locked>> | 98% | 51,822 psi | 86% | 2490 fps | 99.5% |
| Norma 200 | <<locked>> | 84% | 53,780 psi | 89% | 2428 fps | 100% |
| Norma 201 | <<locked>> | 94% | 51,256 psi | 85% | 2467 fps | 99.5% |
| Norma 202 | <<locked>> | 94% | 51,401 psi | 85% | 2477 fps | 100% |
| Norma 203B | <<locked>> | 98% | 51,982 psi | 86% | 2530 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 98% | 52,257 psi | 87% | 2552 fps | 98.7% |
| Ramshot TAC | <<locked>> | 92% | 52,649 psi | 87% | 2484 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 92% | 51,372 psi | 85% | 2503 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 90% | 53,519 psi | 89% | 2480 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,214 psi | 57% | 1509 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 51,880 psi | 86% | 2470 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 52,330 psi | 87% | 2595 fps | 98.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 49,023 psi | 81% | 2575 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 52,359 psi | 87% | 2461 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 51,358 psi | 85% | 2461 fps | 99.5% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,254 psi | 80% | 2477 fps | 98.8% |
| Shooters World AR Plus | <<locked>> | 82% | 51,938 psi | 86% | 2470 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 96% | 54,375 psi | 90% | 2543 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 51,822 psi | 86% | 2490 fps | 99.5% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 52,214 psi | 87% | 2444 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 52,852 psi | 88% | 2152 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 51,329 psi | 85% | 2470 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 50,444 psi | 84% | 2533 fps | 98.5% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 51,547 psi | 86% | 2428 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 53,809 psi | 89% | 2507 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 54,128 psi | 90% | 2533 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 53,824 psi | 89% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 52,779 psi | 88% | 2421 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 53,069 psi | 88% | 2513 fps | 99.7% |
| Somchem S335 | <<locked>> | 94% | 52,663 psi | 87% | 2428 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 53,142 psi | 88% | 2507 fps | 98.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,240 psi | 82% | 2477 fps | 98.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,346 psi | 59% | 2316 fps | 96.8% |
| Vihtavuori N120 | <<locked>> | 82% | 52,475 psi | 87% | 2333 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 53,925 psi | 90% | 2408 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 53,447 psi | 89% | 2418 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 53,142 psi | 88% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 51,837 psi | 86% | 2461 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 47,630 psi | 79% | 2425 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 92% | 52,576 psi | 87% | 2477 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 98% | 53,258 psi | 88% | 2500 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,627 psi | 72% | 2365 fps | 97.6% |
| Winchester 748 | <<locked>> | 90% | 51,909 psi | 86% | 2530 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,315 psi | 87% | 2523 fps | 99.2% |
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% | 36,970 psi | 61% | 2201 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 47,630 psi | 79% | 2421 fps | 97.3% |
| Accurate 2230 | <<locked>> | 80% | 47,935 psi | 80% | 2431 fps | 97.8% |
| Accurate 2460 | <<locked>> | 80% | 39,856 psi | 66% | 2280 fps | 99.3% |
| Accurate 2495 | <<locked>> | 80% | 29,486 psi | 49% | 2113 fps | 99.5% |
| Accurate 2520 | <<locked>> | 80% | 33,721 psi | 56% | 2215 fps | 97.9% |
| Accurate 2520 | <<locked>> | 80% | 33,721 psi | 56% | 2215 fps | 97.9% |
| Accurate 4064 | <<locked>> | 80% | 27,934 psi | 46% | 2090 fps | 97.2% |
| Accurate LT-30 | <<locked>> | 80% | 45,498 psi | 76% | 2277 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 45,876 psi | 76% | 2290 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 36,129 psi | 60% | 2234 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 49,530 psi | 82% | 2339 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 39,363 psi | 65% | 2280 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 44,498 psi | 74% | 2369 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,853 psi | 60% | 2208 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 80% | 34,069 psi | 57% | 2218 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 40,973 psi | 68% | 2372 fps | 97.5% |
| Alliant Power Pro 2000-MR | 57.5 gr | 90% | 42,308 psi | 70% | 2434 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 33,446 psi | 56% | 2208 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,206 psi | 70% | 2293 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 38,696 psi | 64% | 2310 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 94% | 37,927 psi | 63% | 2359 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,328 psi | 84% | 2352 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,208 psi | 73% | 2277 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 39,827 psi | 66% | 2323 fps | 95% |
| Bofors RP3 | <<locked>> | 86% | 32,634 psi | 54% | 2205 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,189 psi | 63% | 2211 fps | 97.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,359 psi | 55% | 2211 fps | 96.6% |
| Hodgdon CFE223 | 53.6 gr | 82% | 39,392 psi | 65% | 2369 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 37,739 psi | 63% | 2257 fps | 99.7% |
| Hodgdon H335 | <<locked>> | 80% | 43,642 psi | 73% | 2365 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 94% | 44,193 psi | 73% | 2395 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 47,239 psi | 78% | 2316 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 34,069 psi | 57% | 2201 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 32,561 psi | 54% | 2211 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,295 psi | 42% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 34,679 psi | 58% | 2198 fps | 95.3% |
| IMR 3031 | <<locked>> | 80% | 30,023 psi | 50% | 2152 fps | 99% |
| IMR 4064 | <<locked>> | 90% | 38,334 psi | 64% | 2257 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 43,091 psi | 72% | 2264 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 34,853 psi | 58% | 2244 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 35,853 psi | 60% | 2208 fps | 96.6% |
| Lovex D073.4 | <<locked>> | 80% | 48,399 psi | 80% | 2421 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 39,610 psi | 66% | 2280 fps | 98.5% |
| Lovex D073.6 | <<locked>> | 80% | 31,778 psi | 53% | 2172 fps | 97.3% |
| Lovex S060 | <<locked>> | 82% | 37,391 psi | 62% | 2195 fps | 95.7% |
| Lovex S062 | <<locked>> | 82% | 31,821 psi | 53% | 2139 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 47,688 psi | 79% | 2349 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,388 psi | 55% | 2159 fps | 95.9% |
| Norma 202 | <<locked>> | 80% | 33,069 psi | 55% | 2172 fps | 98.3% |
| Norma 203B | <<locked>> | 86% | 35,650 psi | 59% | 2254 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 88% | 37,826 psi | 63% | 2310 fps | 95.4% |
| Ramshot TAC | <<locked>> | 88% | 46,238 psi | 77% | 2388 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 36,941 psi | 61% | 2264 fps | 95.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 38,885 psi | 65% | 2247 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,396 psi | 42% | 1348 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,161 psi | 67% | 2287 fps | 98.9% |
| ReloadSwiss RS 52 | 53.3 gr | 86% | 37,507 psi | 62% | 2343 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 31,270 psi | 52% | 2215 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 36,869 psi | 61% | 2211 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 80% | 31,749 psi | 53% | 2116 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 88% | 32,561 psi | 54% | 2198 fps | 95% |
| Shooters World AR Plus | <<locked>> | 80% | 48,399 psi | 80% | 2421 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,778 psi | 53% | 2172 fps | 97.3% |
| Shooters World Precision | <<locked>> | 82% | 31,821 psi | 53% | 2139 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,496 psi | 71% | 2297 fps | 97.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,140 psi | 83% | 2123 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 44,875 psi | 75% | 2379 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 36,782 psi | 61% | 2293 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,815 psi | 71% | 2303 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 44,005 psi | 73% | 2362 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 36,869 psi | 61% | 2254 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,172 psi | 58% | 2136 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,543 psi | 47% | 2018 fps | 97.8% |
| Somchem S321 | <<locked>> | 80% | 38,130 psi | 63% | 2274 fps | 97.6% |
| Somchem S335 | <<locked>> | 80% | 34,621 psi | 58% | 2142 fps | 99.1% |
| Somchem S341 | <<locked>> | 84% | 37,898 psi | 63% | 2264 fps | 95.7% |
| Somchem S355 | <<locked>> | 88% | 34,069 psi | 57% | 2211 fps | 95.2% |
| Somchem S365 | <<locked>> | 96% | 31,270 psi | 52% | 2218 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 49,487 psi | 82% | 2297 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 39,958 psi | 66% | 2211 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,099 psi | 58% | 2146 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 80% | 30,168 psi | 50% | 2116 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 80% | 31,314 psi | 52% | 2119 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 86% | 30,255 psi | 50% | 2110 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 35,549 psi | 59% | 2201 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 80% | 29,892 psi | 50% | 2100 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 35,853 psi | 60% | 2221 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 36,970 psi | 61% | 2287 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,189 psi | 65% | 2316 fps | 96.9% |
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 90 powders for 9.3 x 66 Sako loaded with the .366 | 255gr | Geco EXPRESS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,598 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,598 fps. Accurate 4064 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 255.0 gr projectile in 0.366" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, ADI AR 2208, Alliant Reloder- TS 15.5 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 | 255gr | Geco EXPRESS 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.