Load Specifications
Bullet Manufacturer:A-Square
Bullet Weight:220 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.307 Win. load data
Case Length (l3):2.014"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:54 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:20"
Max. allowed Pressure:60,191 psi
Load data in caliber .307 Win. with .308 | 220gr | A-Square MONO RN 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 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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 51,605 psi | 86% | 2119 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,055 psi | 88% | 2178 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 52,127 psi | 87% | 2172 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 51,140 psi | 85% | 2188 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 51,822 psi | 86% | 2205 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,934 psi | 78% | 2208 fps | 97.9% |
| ADI AR 2206H | <<locked>> | 90% | 53,664 psi | 89% | 2231 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 54,302 psi | 90% | 2224 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 88% | 52,866 psi | 88% | 2192 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 52,837 psi | 88% | 2178 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 51,314 psi | 85% | 2234 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 52,750 psi | 88% | 2316 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 53,824 psi | 89% | 2244 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 51,547 psi | 86% | 2123 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 51,213 psi | 85% | 2218 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,746 psi | 78% | 2211 fps | 98.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,882 psi | 90% | 2336 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,229 psi | 88% | 2110 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,055 psi | 88% | 2241 fps | 98.9% |
| Bofors RP3 | <<locked>> | 96% | 54,099 psi | 90% | 2257 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 51,880 psi | 86% | 2142 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 51,648 psi | 86% | 2218 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,345 psi | 89% | 2293 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 53,737 psi | 89% | 2192 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 51,242 psi | 85% | 2175 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 51,837 psi | 86% | 2221 fps | 98.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 50,415 psi | 84% | 2247 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 90% | 54,186 psi | 90% | 2241 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,801 psi | 71% | 2119 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 52,649 psi | 87% | 2264 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 58% | 1316 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 51,909 psi | 86% | 2198 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 53,519 psi | 89% | 2228 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,012 psi | 90% | 2215 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 51,227 psi | 85% | 2152 fps | 95.9% |
| IMR 4198 | <<locked>> | 82% | 51,793 psi | 86% | 2087 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 53,664 psi | 89% | 2211 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,150 psi | 75% | 2165 fps | 97.6% |
| IMR 4895 | <<locked>> | 92% | 52,460 psi | 87% | 2244 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 52,866 psi | 88% | 2192 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 52,808 psi | 88% | 2185 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 52,402 psi | 87% | 2211 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,737 psi | 89% | 2172 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 53,519 psi | 89% | 2211 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,301 psi | 87% | 2205 fps | 97.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,777 psi | 83% | 2188 fps | 95.9% |
| Norma 201 | <<locked>> | 90% | 52,272 psi | 87% | 2185 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 52,576 psi | 87% | 2192 fps | 100% |
| Norma 203B | <<locked>> | 94% | 53,766 psi | 89% | 2251 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 47,065 psi | 78% | 2205 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 94% | 53,954 psi | 90% | 2274 fps | 99.6% |
| Ramshot TAC | <<locked>> | 88% | 53,403 psi | 89% | 2208 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 52,402 psi | 87% | 2221 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,940 psi | 90% | 2195 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,143 psi | 58% | 1342 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 52,562 psi | 87% | 2178 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 52,721 psi | 88% | 2208 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 50,850 psi | 84% | 2267 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,809 psi | 89% | 2339 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,760 psi | 78% | 2228 fps | 97.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,718 psi | 79% | 2241 fps | 97% |
| Rottweil R 901 | <<locked>> | 88% | 53,476 psi | 89% | 2172 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 52,736 psi | 88% | 2185 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 53,577 psi | 89% | 2244 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,301 psi | 87% | 2205 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 52,402 psi | 87% | 2211 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,519 psi | 89% | 2211 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,777 psi | 83% | 2188 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 52,156 psi | 87% | 2156 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 52,185 psi | 87% | 2257 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 52,547 psi | 87% | 2139 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 51,039 psi | 85% | 2182 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 51,822 psi | 86% | 2205 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 51,445 psi | 85% | 2110 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,998 psi | 90% | 2142 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,678 psi | 88% | 2165 fps | 96.1% |
| Somchem S321 | <<locked>> | 86% | 54,143 psi | 90% | 2224 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 53,388 psi | 89% | 2142 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,273 psi | 90% | 2228 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 54,447 psi | 90% | 2247 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,843 psi | 70% | 2162 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 84% | 51,459 psi | 85% | 2083 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 51,474 psi | 86% | 2100 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 52,040 psi | 86% | 2162 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,156 psi | 88% | 2175 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 52,344 psi | 87% | 2192 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,400 psi | 82% | 2205 fps | 98.1% |
| Vihtavuori N530 | <<locked>> | 88% | 53,287 psi | 89% | 2192 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 54,375 psi | 90% | 2211 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,602 psi | 81% | 2208 fps | 97.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,517 psi | 84% | 2198 fps | 99.6% |
| Winchester 748 | <<locked>> | 88% | 52,663 psi | 87% | 2234 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,807 psi | 84% | 2254 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 90% | 51,576 psi | 86% | 2215 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 42,815 psi | 71% | 2008 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,456 psi | 77% | 2096 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,476 psi | 59% | 1946 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,771 psi | 69% | 2060 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 33,562 psi | 56% | 1932 fps | 99.4% |
| Accurate 4350 | <<locked>> | 94% | 38,406 psi | 64% | 2077 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 39,320 psi | 65% | 2021 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 35,607 psi | 59% | 1942 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,321 psi | 69% | 2031 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 40,640 psi | 68% | 2031 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,906 psi | 80% | 2185 fps | 99.4% |
| Alliant Power Pro 2000-MR | 37.2 gr | 82% | 37,681 psi | 63% | 2070 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,561 psi | 54% | 1916 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,530 psi | 81% | 2087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,201 psi | 58% | 1965 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,854 psi | 61% | 2041 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,140 psi | 53% | 1969 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,053 psi | 83% | 2073 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,087 psi | 63% | 2018 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 31,995 psi | 53% | 1916 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,410 psi | 72% | 2028 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,334 psi | 65% | 2044 fps | 99% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,323 psi | 72% | 2152 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 47,297 psi | 79% | 2113 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,645 psi | 79% | 2129 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,248 psi | 67% | 2047 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 47,558 psi | 79% | 2208 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 39,581 psi | 66% | 2028 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,575 psi | 52% | 1916 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,375 psi | 59% | 1998 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,991 psi | 43% | 1171 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,130 psi | 63% | 1991 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 38,856 psi | 65% | 2034 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,157 psi | 58% | 1926 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,370 psi | 80% | 2113 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 49,095 psi | 82% | 2054 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 50,343 psi | 84% | 2169 fps | 95.6% |
| IMR 4831 | <<locked>> | 94% | 37,072 psi | 62% | 2037 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 35,984 psi | 60% | 1988 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 80% | 41,321 psi | 69% | 2031 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 46,253 psi | 77% | 2100 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 37,637 psi | 63% | 2005 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 40,074 psi | 67% | 1978 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 34,954 psi | 58% | 1936 fps | 97.6% |
| Lovex S065 | <<locked>> | 94% | 43,671 psi | 73% | 2083 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 46,572 psi | 77% | 2142 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,667 psi | 64% | 1988 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 38,522 psi | 64% | 1995 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 34,577 psi | 57% | 1955 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 36,593 psi | 61% | 2031 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 33,895 psi | 56% | 1959 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 41,191 psi | 68% | 2031 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,147 psi | 67% | 2044 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,614 psi | 74% | 2070 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,194 psi | 44% | 1198 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,427 psi | 77% | 2100 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 46,311 psi | 77% | 2119 fps | 95.5% |
| ReloadSwiss RS 52 | 35.2 gr | 80% | 36,230 psi | 60% | 2037 fps | 95.9% |
| ReloadSwiss RS 60 | 35.8 gr | 80% | 30,095 psi | 50% | 1929 fps | 97% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,261 psi | 64% | 2090 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,858 psi | 70% | 2142 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 42,438 psi | 71% | 2024 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 36,782 psi | 61% | 1949 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 30,008 psi | 50% | 1870 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 43,671 psi | 73% | 2083 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,637 psi | 63% | 2005 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 34,954 psi | 58% | 1936 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 46,572 psi | 77% | 2142 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,791 psi | 81% | 2113 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,272 psi | 55% | 1952 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,400 psi | 82% | 2103 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,146 psi | 65% | 2005 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,753 psi | 63% | 1995 fps | 97% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,393 psi | 67% | 1962 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,228 psi | 55% | 1857 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 49,472 psi | 82% | 2126 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,222 psi | 73% | 2093 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 39,813 psi | 66% | 1962 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,841 psi | 65% | 2008 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 31,270 psi | 52% | 1880 fps | 95.4% |
| Somchem S365 | <<locked>> | 88% | 28,805 psi | 48% | 1903 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 45,774 psi | 76% | 2014 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,524 psi | 67% | 1959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,897 psi | 60% | 1946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,434 psi | 61% | 1946 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 29,457 psi | 49% | 1834 fps | 96.3% |
| Vihtavuori N160 | <<locked>> | 92% | 38,334 psi | 64% | 2034 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 41,307 psi | 69% | 2028 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 34,954 psi | 58% | 1936 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 37,565 psi | 62% | 2037 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,184 psi | 53% | 1896 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 40,234 psi | 67% | 2060 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 47,558 psi | 79% | 2208 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,086 psi | 62% | 1998 fps | 97.4% |
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 .307 Win. loaded with the .308 | 220gr | A-Square MONO RN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,339 fps; across all powders the maximum-charge window runs from 1,316 fps to 2,339 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 58–90 %, leaving at least 10 % headroom. 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 .307 Win. with the .308 | 220gr | A-Square MONO 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.