Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 200gr | Lapua Mega bullet and 94 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% | 53,272 psi | 89% | 2329 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,679 psi | 89% | 2408 fps | 99.1% |
| Accurate 2460 | <<locked>> | 86% | 51,692 psi | 86% | 2352 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,156 psi | 88% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,055 psi | 88% | 2405 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 52,953 psi | 88% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,582 psi | 69% | 2326 fps | 96.8% |
| Accurate LT-30 | <<locked>> | 84% | 53,751 psi | 89% | 2283 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,172 psi | 90% | 2303 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 52,112 psi | 87% | 2405 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 98% | 53,243 psi | 88% | 2405 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 84% | 53,824 psi | 89% | 2388 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 51,837 psi | 86% | 2372 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 54,462 psi | 90% | 2392 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,069 psi | 88% | 2457 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 51,430 psi | 85% | 2497 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 51,953 psi | 86% | 2418 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,374 psi | 89% | 2333 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 52,823 psi | 88% | 2438 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,714 psi | 71% | 2333 fps | 97% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,965 psi | 81% | 2467 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 52,837 psi | 88% | 2290 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 51,663 psi | 86% | 2418 fps | 98.7% |
| Bofors RP3 | <<locked>> | 98% | 51,938 psi | 86% | 2431 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,143 psi | 90% | 2359 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,548 psi | 89% | 2441 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 51,634 psi | 86% | 2474 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 52,634 psi | 87% | 2375 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,476 psi | 89% | 2398 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 53,954 psi | 90% | 2441 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 92% | 52,504 psi | 87% | 2415 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,812 psi | 64% | 2238 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,114 psi | 90% | 2484 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 57% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,346 psi | 90% | 2421 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 51,445 psi | 85% | 2405 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 52,489 psi | 87% | 2385 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,867 psi | 89% | 2369 fps | 96.2% |
| IMR 4198 | <<locked>> | 86% | 53,983 psi | 90% | 2297 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 52,301 psi | 87% | 2382 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,147 psi | 67% | 2280 fps | 96.5% |
| IMR 4895 | <<locked>> | 96% | 54,070 psi | 90% | 2464 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 51,837 psi | 86% | 2372 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 51,808 psi | 86% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,331 psi | 90% | 2431 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 52,982 psi | 88% | 2349 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 51,779 psi | 86% | 2385 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,747 psi | 79% | 2329 fps | 96.6% |
| Norma 200 | <<locked>> | 82% | 53,664 psi | 89% | 2313 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,259 psi | 90% | 2405 fps | 100% |
| Norma 202 | <<locked>> | 94% | 54,418 psi | 90% | 2408 fps | 100% |
| Norma 203B | <<locked>> | 96% | 51,909 psi | 86% | 2425 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 42,540 psi | 71% | 2329 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 96% | 52,301 psi | 87% | 2451 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 52,359 psi | 87% | 2385 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 51,068 psi | 85% | 2402 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,330 psi | 89% | 2375 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,563 psi | 57% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 51,590 psi | 86% | 2359 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 51,474 psi | 86% | 2379 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 52,504 psi | 87% | 2493 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,344 psi | 87% | 2523 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,061 psi | 70% | 2346 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 90% | 52,446 psi | 87% | 2352 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 51,590 psi | 86% | 2362 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,793 psi | 86% | 2421 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,747 psi | 79% | 2329 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,331 psi | 90% | 2431 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 51,779 psi | 86% | 2385 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 51,648 psi | 86% | 2336 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,288 psi | 90% | 2402 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,679 psi | 89% | 2474 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,389 psi | 90% | 2352 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,563 psi | 89% | 2405 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,954 psi | 90% | 2428 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,490 psi | 89% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 52,591 psi | 87% | 2313 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 52,794 psi | 88% | 2405 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 52,402 psi | 87% | 2320 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 52,837 psi | 88% | 2402 fps | 99.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,533 psi | 87% | 2418 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,739 psi | 63% | 2283 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 88% | 53,461 psi | 89% | 2293 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,287 psi | 89% | 2306 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,243 psi | 88% | 2372 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 51,895 psi | 86% | 2352 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,879 psi | 85% | 2365 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,744 psi | 74% | 2326 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 90% | 52,228 psi | 87% | 2372 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 53,055 psi | 88% | 2388 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,526 psi | 72% | 2329 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 45,948 psi | 76% | 2316 fps | 99% |
| Winchester 748 | <<locked>> | 90% | 51,111 psi | 85% | 2411 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,200 psi | 88% | 2434 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% | 39,334 psi | 65% | 2142 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,488 psi | 84% | 2365 fps | 98.7% |
| Accurate 2460 | <<locked>> | 80% | 42,612 psi | 71% | 2228 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,691 psi | 53% | 2064 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,695 psi | 63% | 2185 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 29,965 psi | 50% | 2047 fps | 98.8% |
| Accurate 4350 | <<locked>> | 96% | 36,201 psi | 60% | 2231 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 47,761 psi | 79% | 2208 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,109 psi | 80% | 2224 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,129 psi | 60% | 2146 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 34,766 psi | 58% | 2103 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 47,311 psi | 79% | 2306 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,101 psi | 63% | 2159 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 36,709 psi | 61% | 2162 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,801 psi | 73% | 2323 fps | 98.9% |
| Alliant Power Pro 2000-MR | 37.9 gr | 84% | 36,985 psi | 61% | 2244 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,530 psi | 49% | 2034 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,498 psi | 74% | 2221 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,142 psi | 57% | 2129 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 96% | 38,072 psi | 63% | 2247 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,301 psi | 55% | 2175 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,296 psi | 77% | 2208 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,043 psi | 62% | 2182 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 28,645 psi | 48% | 2028 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,045 psi | 67% | 2152 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,853 psi | 60% | 2172 fps | 98.4% |
| Hodgdon CFE223 | 36.9 gr | 80% | 39,276 psi | 65% | 2274 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,105 psi | 72% | 2247 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,830 psi | 73% | 2267 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 39,015 psi | 65% | 2215 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 36,318 psi | 60% | 2156 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,518 psi | 54% | 2110 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,372 psi | 54% | 2123 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,527 psi | 42% | 1260 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,085 psi | 58% | 2116 fps | 96.8% |
| IMR 3031 | <<locked>> | 80% | 34,867 psi | 58% | 2159 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,301 psi | 57% | 2090 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,488 psi | 84% | 2323 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 45,643 psi | 76% | 2195 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 49,371 psi | 82% | 2339 fps | 95.2% |
| IMR 4831 | <<locked>> | 96% | 35,621 psi | 59% | 2198 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 32,822 psi | 55% | 2113 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 38,101 psi | 63% | 2159 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 42,090 psi | 70% | 2224 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 34,055 psi | 57% | 2126 fps | 98.8% |
| Lovex S060 | <<locked>> | 80% | 36,941 psi | 61% | 2096 fps | 96.8% |
| Lovex S062 | <<locked>> | 80% | 31,734 psi | 53% | 2051 fps | 96.7% |
| Lovex S065 | <<locked>> | 96% | 42,163 psi | 70% | 2244 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 50,227 psi | 83% | 2274 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,302 psi | 59% | 2106 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 35,259 psi | 59% | 2123 fps | 99.4% |
| Norma 203B | <<locked>> | 80% | 31,517 psi | 52% | 2077 fps | 95% |
| Norma URP | <<locked>> | 96% | 37,507 psi | 62% | 2238 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 82% | 33,127 psi | 55% | 2126 fps | 95.2% |
| Ramshot TAC | <<locked>> | 84% | 42,946 psi | 71% | 2241 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,811 psi | 61% | 2169 fps | 96.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,031 psi | 68% | 2195 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,643 psi | 43% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,569 psi | 71% | 2231 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 45,150 psi | 75% | 2287 fps | 95.1% |
| ReloadSwiss RS 52 | 35.8 gr | 82% | 34,983 psi | 58% | 2201 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,456 psi | 46% | 2037 fps | 95.6% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,349 psi | 65% | 2300 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 39,146 psi | 65% | 2156 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 33,562 psi | 56% | 2067 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 84% | 30,864 psi | 51% | 2073 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 42,163 psi | 70% | 2244 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,055 psi | 57% | 2126 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 31,734 psi | 53% | 2051 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,150 psi | 75% | 2244 fps | 99.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,630 psi | 79% | 2316 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,447 psi | 57% | 2162 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,252 psi | 75% | 2234 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,654 psi | 68% | 2215 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,650 psi | 58% | 2119 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,086 psi | 62% | 2080 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,284 psi | 50% | 1972 fps | 99.1% |
| Somchem S321 | <<locked>> | 80% | 40,321 psi | 67% | 2221 fps | 98.9% |
| Somchem S335 | <<locked>> | 80% | 36,492 psi | 61% | 2087 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 35,259 psi | 59% | 2126 fps | 96.1% |
| Somchem S355 | <<locked>> | 82% | 30,240 psi | 50% | 2041 fps | 95.1% |
| Somchem S365 | <<locked>> | 90% | 27,818 psi | 46% | 2054 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 42,105 psi | 70% | 2146 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,130 psi | 62% | 2087 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,314 psi | 54% | 2064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,344 psi | 55% | 2070 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 26,789 psi | 45% | 1946 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 94% | 37,188 psi | 62% | 2195 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 37,695 psi | 63% | 2149 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 31,995 psi | 53% | 2060 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 96% | 38,392 psi | 64% | 2241 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,460 psi | 56% | 2093 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 36,405 psi | 60% | 2185 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,547 psi | 56% | 2116 fps | 96.4% |
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 94 powders for .308 Win. Ackley Improved loaded with the .308 | 200gr | Lapua Mega. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,414 fps to 2,523 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 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 200.0 gr projectile in 0.308" calls for a 1:11.5 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, Hodgdon CFE223 rank at the top here: for .308 Win. Ackley Improved with the .308 | 200gr | 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.