Load Specifications
Load data in caliber .300 HAM'R with .308 | 125gr | Hornady SST bullet and 22 powders. The key underlying parameters are shown in the table above.
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 1680ᴾ | <<locked>> | 100% | 51,547 psi | 90% | 2205 fps | 97.8% |
| Accurate 5744 | <<locked>> | 84% | 49,574 psi | 86% | 2192 fps | 98.4% |
| Accurate No. 11 FS | <<locked>> | 88% | 50,836 psi | 88% | 2188 fps | 100% |
| ADI AR 2205 | <<locked>> | 90% | 49,705 psi | 86% | 2103 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 40,567 psi | 71% | 2142 fps | 99.2% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 42,946 psi | 75% | 2139 fps | 97% |
| Hodgdon LilGun | <<locked>> | 84% | 50,647 psi | 88% | 2205 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,281 psi | 46% | 1283 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 37,637 psi | 65% | 2051 fps | 95.8% |
| IMR 4227 | <<locked>> | 98% | 51,401 psi | 89% | 2201 fps | 99.6% |
| Lovex D060 | <<locked>> | 90% | 49,574 psi | 86% | 2192 fps | 98.4% |
| Lovex D063 | <<locked>> | 86% | 49,617 psi | 86% | 2185 fps | 98.5% |
| Lovex S040 | <<locked>> | 84% | 51,532 psi | 90% | 2110 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 50,691 psi | 88% | 2192 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,395 psi | 42% | 1299 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 48,892 psi | 85% | 2211 fps | 99.3% |
| Shooters World Blackout | <<locked>> | 86% | 49,617 psi | 86% | 2185 fps | 98.5% |
| Shooters World Buffalo Rifle | <<locked>> | 90% | 49,574 psi | 86% | 2192 fps | 98.4% |
| Shooters World SOCOM | <<locked>> | 90% | 50,502 psi | 88% | 2178 fps | 99% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 46,093 psi | 80% | 2028 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 49,748 psi | 87% | 2126 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 41,104 psi | 71% | 2123 fps | 99.8% |
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 94% | 41,220 psi | 72% | 2067 fps | 95.6% |
| Accurate 5744 | <<locked>> | 80% | 43,221 psi | 75% | 2100 fps | 97.2% |
| Accurate No. 11 FS | <<locked>> | 80% | 38,232 psi | 66% | 2018 fps | 98.9% |
| ADI AR 2205 | <<locked>> | 80% | 35,723 psi | 62% | 1913 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 88% | 26,513 psi | 46% | 1880 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 96% | 37,724 psi | 66% | 2057 fps | 95.6% |
| Hodgdon LilGun | <<locked>> | 80% | 43,598 psi | 76% | 2119 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,159 psi | 32% | 1135 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 35,375 psi | 62% | 2008 fps | 95% |
| IMR 4227 | <<locked>> | 82% | 29,907 psi | 52% | 1867 fps | 95.1% |
| Lovex D060 | <<locked>> | 80% | 36,405 psi | 63% | 1985 fps | 95.4% |
| Lovex D063 | <<locked>> | 80% | 39,784 psi | 69% | 2044 fps | 96.6% |
| Lovex S040 | <<locked>> | 80% | 45,252 psi | 79% | 2034 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 26,368 psi | 46% | 1804 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 16,679 psi | 29% | 1148 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 30,197 psi | 53% | 1913 fps | 95% |
| Shooters World Blackout | <<locked>> | 80% | 39,784 psi | 69% | 2044 fps | 96.6% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 36,405 psi | 63% | 1985 fps | 95.4% |
| Shooters World SOCOM | <<locked>> | 80% | 35,128 psi | 61% | 1955 fps | 95.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 25,396 psi | 44% | 1719 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 31,647 psi | 55% | 1880 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 23,670 psi | 41% | 1791 fps | 95.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 22 powders for .300 HAM'R loaded with the .308 | 125gr | Hornady SST. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,211 fps; across all powders the maximum-charge window runs from 1,283 fps to 2,211 fps. Accurate 1680 gives the best case fill at 100 %, and 22 of the 22 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (396 MPa), the top charges use 42–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 1680, ADI AR 2207, Alliant Reloder-7 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.