Load Specifications
Load data in caliber .300 HAM'R with .308 | 122gr | Sax KJG-SX bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 5744, Shooters World Buffalo Rifle and Shooters World Blackout.
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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Max Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 5744 | <<locked>> | 88% | 49,980 psi | 87% | 2156 fps | 97.3% |
| Accurate No. 11 FS | <<locked>> | 92% | 50,952 psi | 89% | 2156 fps | 99.6% |
| ADI AR 2205 | <<locked>> | 94% | 49,705 psi | 86% | 2073 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 33,866 psi | 59% | 2008 fps | 96.7% |
| Hodgdon LilGun | <<locked>> | 88% | 50,125 psi | 87% | 2182 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,555 psi | 43% | 1237 fps | 100% |
| IMR 4227ᴾ | <<locked>> | 100% | 47,195 psi | 82% | 2113 fps | 98.3% |
| Lovex D060 | <<locked>> | 94% | 49,980 psi | 87% | 2156 fps | 97.3% |
| Lovex D063 | <<locked>> | 90% | 49,922 psi | 87% | 2149 fps | 97.4% |
| Lovex S040 | <<locked>> | 86% | 48,544 psi | 84% | 2051 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 43,772 psi | 76% | 2080 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,568 psi | 39% | 1253 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 45,208 psi | 79% | 2129 fps | 97.8% |
| Shooters World Blackout | <<locked>> | 90% | 49,922 psi | 87% | 2149 fps | 97.4% |
| Shooters World Buffalo Rifle | <<locked>> | 94% | 49,980 psi | 87% | 2156 fps | 97.3% |
| Shooters World SOCOM | <<locked>> | 94% | 50,763 psi | 88% | 2146 fps | 98% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 40,205 psi | 70% | 1942 fps | 100% |
| Vihtavuori N110 | <<locked>> | 98% | 48,747 psi | 85% | 2096 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 34,577 psi | 60% | 1995 fps | 98% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 5744 | 16.1 gr | 82% | 41,394 psi | 72% | 2034 fps | 95.4% |
| Accurate No. 11 FS | <<locked>> | 80% | 33,040 psi | 57% | 1903 fps | 96.6% |
| ADI AR 2205 | <<locked>> | 80% | 31,198 psi | 54% | 1808 fps | 97.8% |
| ADI AR 2207 | <<locked>> | 96% | 29,675 psi | 52% | 1926 fps | 95.1% |
| Hodgdon LilGun | <<locked>> | 80% | 36,898 psi | 64% | 2018 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 16,882 psi | 29% | 1096 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 33,895 psi | 59% | 1913 fps | 95.1% |
| Lovex D060 | <<locked>> | 88% | 41,394 psi | 72% | 2034 fps | 95.4% |
| Lovex D063 | <<locked>> | 84% | 40,306 psi | 70% | 2014 fps | 95.2% |
| Lovex S040 | <<locked>> | 80% | 40,321 psi | 70% | 1949 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 24,047 psi | 42% | 1732 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 15,345 psi | 27% | 1109 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 36,434 psi | 63% | 1998 fps | 95.7% |
| Shooters World Blackout | 17.2 gr | 84% | 40,306 psi | 70% | 2014 fps | 95.2% |
| Shooters World Buffalo Rifle | 16.1 gr | 88% | 41,394 psi | 72% | 2034 fps | 95.4% |
| Shooters World SOCOM | <<locked>> | 86% | 38,189 psi | 66% | 1972 fps | 95.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 21,770 psi | 38% | 1631 fps | 99.7% |
| Vihtavuori N110 | <<locked>> | 80% | 26,803 psi | 47% | 1778 fps | 99.8% |
| Vihtavuori N120 | <<locked>> | 94% | 28,239 psi | 49% | 1873 fps | 95.9% |
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 19 powders for .300 HAM'R loaded with the .308 | 122gr | Sax KJG-SX. Hodgdon LilGun delivers the highest muzzle velocity at 2,182 fps; across all powders the maximum-charge window runs from 1,237 fps to 2,182 fps. ADI AR 2207 gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (396 MPa), the top charges use 39–89 %, leaving at least 11 % headroom. The 122.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, IMR 4227 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. Accurate 5744, Shooters World Buffalo Rifle, Shooters World Blackout rank at the top here: for .300 HAM'R with the .308 | 122gr | Sax KJG-SX they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.