Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 200gr | Barnes X S 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, ReloadSwiss RS 52 and ReloadSwiss RS 60.
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>> | 88% | 53,345 psi | 89% | 2303 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 51,866 psi | 86% | 2326 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 51,097 psi | 85% | 2326 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,331 psi | 90% | 2405 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,331 psi | 90% | 2405 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,911 psi | 90% | 2398 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,005 psi | 75% | 2349 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 82% | 52,605 psi | 87% | 2247 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 52,924 psi | 88% | 2264 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 51,663 psi | 86% | 2372 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 96% | 52,402 psi | 87% | 2369 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 82% | 52,823 psi | 88% | 2352 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,041 psi | 90% | 2375 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 53,664 psi | 89% | 2362 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 52,373 psi | 87% | 2421 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,824 psi | 89% | 2507 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 51,619 psi | 86% | 2388 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,403 psi | 89% | 2310 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 52,460 psi | 87% | 2405 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,063 psi | 75% | 2349 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,619 psi | 86% | 2480 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 51,547 psi | 86% | 2251 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,056 psi | 90% | 2428 fps | 98.9% |
| Bofors RP3 | <<locked>> | 96% | 52,040 psi | 86% | 2405 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,592 psi | 89% | 2329 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 52,837 psi | 88% | 2408 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,056 psi | 90% | 2484 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 88% | 53,954 psi | 90% | 2365 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 51,982 psi | 86% | 2356 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,272 psi | 89% | 2408 fps | 98.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,040 psi | 88% | 2454 fps | 96.1% |
| Hodgdon H4198 | <<locked>> | 82% | 54,404 psi | 90% | 2283 fps | 100% |
| Hodgdon H4895 | <<locked>> | 90% | 52,025 psi | 86% | 2382 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,713 psi | 69% | 2260 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 53,156 psi | 88% | 2448 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 59% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 51,953 psi | 86% | 2369 fps | 99.6% |
| IMR 3031 | <<locked>> | 94% | 52,837 psi | 88% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,012 psi | 90% | 2382 fps | 99.2% |
| IMR 4198 | <<locked>> | 84% | 53,084 psi | 88% | 2267 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 38,957 psi | 65% | 2231 fps | 95.9% |
| IMR 4895 | <<locked>> | 94% | 53,679 psi | 89% | 2434 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 54,041 psi | 90% | 2375 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 51,634 psi | 86% | 2333 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,824 psi | 89% | 2398 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 52,054 psi | 86% | 2313 fps | 99.3% |
| Lovex S062 | <<locked>> | 94% | 51,967 psi | 86% | 2362 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,560 psi | 84% | 2343 fps | 96.9% |
| Norma 201 | <<locked>> | 92% | 54,070 psi | 90% | 2375 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 54,259 psi | 90% | 2382 fps | 100% |
| Norma 203B | <<locked>> | 94% | 51,590 psi | 86% | 2395 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 45,237 psi | 75% | 2346 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 94% | 51,517 psi | 86% | 2415 fps | 99.2% |
| Ramshot TAC | <<locked>> | 88% | 51,488 psi | 86% | 2346 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,490 psi | 89% | 2408 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 86% | 52,373 psi | 87% | 2339 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,389 psi | 59% | 1440 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,201 psi | 90% | 2369 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,085 psi | 90% | 2392 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 51,590 psi | 86% | 2457 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 51,547 psi | 86% | 2487 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,686 psi | 74% | 2362 fps | 96.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,832 psi | 76% | 2372 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 88% | 53,142 psi | 88% | 2329 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 51,576 psi | 86% | 2333 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 98% | 51,532 psi | 86% | 2392 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,560 psi | 84% | 2343 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,824 psi | 89% | 2398 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 51,967 psi | 86% | 2362 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,940 psi | 90% | 2339 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,563 psi | 89% | 2369 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 52,779 psi | 88% | 2441 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,519 psi | 89% | 2316 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 52,953 psi | 88% | 2372 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 52,997 psi | 88% | 2392 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 52,939 psi | 88% | 2287 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 52,141 psi | 87% | 2283 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 52,098 psi | 87% | 2372 fps | 99.9% |
| Somchem S335 | <<locked>> | 90% | 52,127 psi | 87% | 2290 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 51,982 psi | 86% | 2365 fps | 99.2% |
| Somchem S355 | <<locked>> | 98% | 52,373 psi | 87% | 2392 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,553 psi | 67% | 2306 fps | 99.1% |
| Unknown powderᴾ | <<locked>> | 100% | 49,226 psi | 82% | 2392 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 86% | 52,881 psi | 88% | 2260 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 52,620 psi | 87% | 2274 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,171 psi | 88% | 2346 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,317 psi | 90% | 2359 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,708 psi | 89% | 2375 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,369 psi | 79% | 2339 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 88% | 51,503 psi | 86% | 2336 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 94% | 52,678 psi | 88% | 2362 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,340 psi | 77% | 2349 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,559 psi | 81% | 2329 fps | 99.2% |
| Winchester 748 | <<locked>> | 88% | 54,317 psi | 90% | 2428 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,040 psi | 88% | 2454 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,215 psi | 90% | 2421 fps | 99.8% |
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% | 2156 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,687 psi | 76% | 2241 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,868 psi | 60% | 2100 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,494 psi | 66% | 2195 fps | 99.5% |
| Accurate 2520 | <<locked>> | 80% | 39,494 psi | 66% | 2195 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 33,881 psi | 56% | 2090 fps | 99.4% |
| Accurate 4350 | <<locked>> | 94% | 37,115 psi | 62% | 2218 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 49,647 psi | 82% | 2208 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,966 psi | 83% | 2228 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,812 psi | 64% | 2165 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 35,114 psi | 58% | 2083 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 49,777 psi | 83% | 2313 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,611 psi | 67% | 2175 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 39,494 psi | 66% | 2178 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,572 psi | 77% | 2336 fps | 99.2% |
| Alliant Power Pro 2000-MR | 36.4 gr | 82% | 36,912 psi | 61% | 2211 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,242 psi | 54% | 2060 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,529 psi | 79% | 2234 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,896 psi | 58% | 2110 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,218 psi | 63% | 2221 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,692 psi | 56% | 2156 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,501 psi | 81% | 2215 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,217 psi | 62% | 2159 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 31,865 psi | 53% | 2064 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,699 psi | 71% | 2172 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,769 psi | 64% | 2195 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,872 psi | 70% | 2293 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 80% | 42,656 psi | 71% | 2211 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,805 psi | 81% | 2313 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 39,494 psi | 66% | 2195 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 98% | 49,806 psi | 83% | 2408 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 80% | 51,343 psi | 85% | 2244 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 39,015 psi | 65% | 2175 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,141 psi | 55% | 2093 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,054 psi | 55% | 2106 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,121 psi | 43% | 1253 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,896 psi | 58% | 2083 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 34,867 psi | 58% | 2126 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,534 psi | 57% | 2064 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 47,514 psi | 79% | 2195 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 36,854 psi | 61% | 2192 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 35,578 psi | 59% | 2136 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 80% | 40,611 psi | 67% | 2175 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 45,556 psi | 76% | 2247 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 37,289 psi | 62% | 2156 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 39,494 psi | 66% | 2116 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 34,867 psi | 58% | 2080 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 42,859 psi | 71% | 2224 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 38,392 psi | 64% | 2133 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 38,014 psi | 63% | 2142 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 34,301 psi | 57% | 2103 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 38,000 psi | 63% | 2218 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 33,620 psi | 56% | 2106 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 42,902 psi | 71% | 2215 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,421 psi | 65% | 2192 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,656 psi | 73% | 2211 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 44% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,049 psi | 75% | 2241 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,747 psi | 79% | 2300 fps | 95.5% |
| ReloadSwiss RS 52 | 34.5 gr | 80% | 35,650 psi | 59% | 2182 fps | 95.6% |
| ReloadSwiss RS 60 | 35 gr | 80% | 29,979 psi | 50% | 2073 fps | 96.7% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,668 psi | 66% | 2277 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,366 psi | 72% | 2329 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 42,569 psi | 71% | 2175 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 36,869 psi | 61% | 2096 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 30,255 psi | 50% | 2021 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 42,859 psi | 71% | 2224 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,289 psi | 62% | 2156 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 34,867 psi | 58% | 2080 fps | 97.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,761 psi | 79% | 2257 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,285 psi | 84% | 2326 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,896 psi | 58% | 2139 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,863 psi | 80% | 2244 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,089 psi | 68% | 2192 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,231 psi | 62% | 2139 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,900 psi | 66% | 2100 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,953 psi | 55% | 1995 fps | 99.5% |
| Somchem S321 | <<locked>> | 80% | 43,221 psi | 72% | 2241 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 39,262 psi | 65% | 2103 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,898 psi | 63% | 2146 fps | 96.7% |
| Somchem S355 | <<locked>> | 80% | 31,154 psi | 52% | 2024 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 28,877 psi | 48% | 2047 fps | 95.3% |
| Unknown powder | <<locked>> | 94% | 41,292 psi | 69% | 2260 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 44,918 psi | 75% | 2159 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,740 psi | 66% | 2100 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,404 psi | 59% | 2090 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,969 psi | 60% | 2090 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,544 psi | 49% | 1975 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 94% | 39,697 psi | 66% | 2215 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 40,321 psi | 67% | 2169 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 34,664 psi | 58% | 2083 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 38,928 psi | 65% | 2221 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,765 psi | 56% | 2073 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 41,930 psi | 70% | 2254 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 49,806 psi | 83% | 2408 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,469 psi | 74% | 2283 fps | 98.8% |
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 96 powders for .308 Win. Ackley Improved loaded with the .308 | 200gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,507 fps; across all powders the maximum-charge window runs from 1,411 fps to 2,507 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:11.0 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 52, ReloadSwiss RS 60 rank at the top here: for .308 Win. Ackley Improved with the .308 | 200gr | Barnes X S 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.