Load Specifications
Load data in caliber .300 HAM'R with .308 | 155gr | Sierra MatchKing bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 1680, ReloadSwiss RS 36 and IMR 4227.
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 1680 | <<locked>> | 96% | 49,835 psi | 87% | 1929 fps | 99.1% |
| Accurate 5744 | <<locked>> | 82% | 50,821 psi | 88% | 1946 fps | 99.7% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 46,978 psi | 82% | 1886 fps | 96.4% |
| Accurate No. 11 FS | <<locked>> | 84% | 49,559 psi | 86% | 1906 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 50,357 psi | 88% | 1850 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 46,006 psi | 80% | 1949 fps | 100% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 36,622 psi | 64% | 1850 fps | 97.1% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 48,747 psi | 85% | 1959 fps | 99.4% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 44,396 psi | 77% | 1877 fps | 96.1% |
| Hodgdon H4198 | <<locked>> | 98% | 49,269 psi | 86% | 1923 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,557 psi | 48% | 1129 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 42,032 psi | 73% | 1877 fps | 98.9% |
| IMR 4227 | <<locked>> | 94% | 49,719 psi | 86% | 1919 fps | 100% |
| Lovex D060 | <<locked>> | 88% | 50,821 psi | 88% | 1946 fps | 99.7% |
| Lovex D063 | <<locked>> | 84% | 50,502 psi | 88% | 1932 fps | 99.7% |
| Lovex S053 | <<locked>> | 96% | 49,400 psi | 86% | 1906 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 40,524 psi | 70% | 1906 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,889 psi | 45% | 1145 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 51,227 psi | 89% | 1972 fps | 100% |
| Shooters World Blackout | <<locked>> | 84% | 50,502 psi | 88% | 1932 fps | 99.7% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 50,821 psi | 88% | 1946 fps | 99.7% |
| Shooters World SOCOM | <<locked>> | 86% | 48,675 psi | 85% | 1903 fps | 99.8% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 50,691 psi | 88% | 1811 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 51,837 psi | 90% | 1873 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 46,499 psi | 81% | 1923 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 36,448 psi | 63% | 1801 fps | 96.6% |
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 1680 | 17.8 gr | 84% | 31,792 psi | 55% | 1690 fps | 95.2% |
| Accurate 5744 | <<locked>> | 80% | 47,587 psi | 83% | 1906 fps | 99.4% |
| Accurate LT-30 | <<locked>> | 96% | 41,060 psi | 71% | 1811 fps | 95% |
| Accurate No. 11 FS | <<locked>> | 80% | 42,496 psi | 74% | 1827 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 39,044 psi | 68% | 1722 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 22,655 psi | 39% | 1578 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 96% | 31,618 psi | 55% | 1772 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 86% | 29,718 psi | 52% | 1690 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 98% | 41,626 psi | 72% | 1844 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 96% | 46,079 psi | 80% | 1883 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,102 psi | 33% | 997 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 28,819 psi | 50% | 1663 fps | 95.1% |
| IMR 4227 | 14.9 gr | 80% | 31,285 psi | 54% | 1670 fps | 97.8% |
| Lovex D060 | <<locked>> | 80% | 39,566 psi | 69% | 1798 fps | 98.3% |
| Lovex D063 | <<locked>> | 80% | 44,077 psi | 77% | 1860 fps | 99.1% |
| Lovex S053 | <<locked>> | 80% | 29,617 psi | 52% | 1647 fps | 99.6% |
| Norma 200 | <<locked>> | 90% | 27,876 psi | 48% | 1703 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,782 psi | 31% | 1014 fps | 100% |
| ReloadSwiss RS 36 | 15.8 gr | 80% | 29,327 psi | 51% | 1670 fps | 97% |
| Shooters World Blackout | <<locked>> | 80% | 44,077 psi | 77% | 1860 fps | 99.1% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 39,566 psi | 69% | 1798 fps | 98.3% |
| Shooters World SOCOM | <<locked>> | 80% | 39,015 psi | 68% | 1781 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,340 psi | 49% | 1549 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,752 psi | 62% | 1696 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 23,221 psi | 40% | 1572 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 96% | 31,604 psi | 55% | 1722 fps | 95% |
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 26 powders for .300 HAM'R loaded with the .308 | 155gr | Sierra MatchKing. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,972 fps; across all powders the maximum-charge window runs from 1,129 fps to 1,972 fps. Accurate LT-30 gives the best case fill at 100 %, and 26 of the 26 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (396 MPa), the top charges use 45–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate LT-30, ADI AR 2207, Alliant Reloder-10x 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 1680, ReloadSwiss RS 36, IMR 4227 rank at the top here: for .300 HAM'R with the .308 | 155gr | Sierra MatchKing 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.