Load Specifications
Load data in caliber .300 HAM'R with .308 | 155gr | Norma GTX bullet and 25 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Shooters World Buffalo Rifle and Lovex D060.
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>> | 98% | 51,082 psi | 89% | 1923 fps | 99% |
| Accurate 5744 | <<locked>> | 82% | 49,269 psi | 86% | 1906 fps | 99.4% |
| Accurate No. 11 FS | <<locked>> | 86% | 50,705 psi | 88% | 1900 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 48,921 psi | 85% | 1818 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 43,874 psi | 76% | 1909 fps | 100% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 34,824 psi | 61% | 1808 fps | 96.2% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 46,050 psi | 80% | 1906 fps | 98.9% |
| Hodgdon H4198ᴾ | <<locked>> | 100% | 50,966 psi | 89% | 1919 fps | 96.2% |
| Hodgdon LilGun | <<locked>> | 82% | 50,850 psi | 88% | 1906 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,122 psi | 47% | 1109 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,205 psi | 70% | 1831 fps | 98.2% |
| IMR 4227 | <<locked>> | 96% | 50,923 psi | 89% | 1909 fps | 100% |
| Lovex D060 | <<locked>> | 88% | 49,269 psi | 86% | 1906 fps | 99.4% |
| Lovex D063 | <<locked>> | 84% | 49,153 psi | 85% | 1900 fps | 99.4% |
| Lovex S040 | <<locked>> | 82% | 50,647 psi | 88% | 1811 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 50,430 psi | 88% | 1900 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 38,682 psi | 67% | 1864 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,425 psi | 44% | 1129 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 49,168 psi | 86% | 1929 fps | 99.9% |
| Shooters World Blackout | <<locked>> | 84% | 49,153 psi | 85% | 1900 fps | 99.4% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 49,269 psi | 86% | 1906 fps | 99.4% |
| Shooters World SOCOM | <<locked>> | 88% | 50,096 psi | 87% | 1896 fps | 99.7% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 48,979 psi | 85% | 1778 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 49,690 psi | 86% | 1837 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,396 psi | 77% | 1883 fps | 100% |
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 | <<locked>> | 86% | 33,098 psi | 58% | 1693 fps | 95.2% |
| Accurate 5744 | <<locked>> | 80% | 45,992 psi | 80% | 1867 fps | 99% |
| Accurate No. 11 FS | <<locked>> | 80% | 40,930 psi | 71% | 1791 fps | 99.9% |
| ADI AR 2205 | <<locked>> | 80% | 37,449 psi | 65% | 1686 fps | 100% |
| ADI AR 2207 | <<locked>> | 82% | 23,105 psi | 40% | 1575 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 98% | 32,242 psi | 56% | 1765 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 88% | 30,661 psi | 53% | 1690 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 98% | 47,529 psi | 83% | 1880 fps | 95.5% |
| Hodgdon LilGun | <<locked>> | 80% | 47,181 psi | 82% | 1873 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,391 psi | 32% | 974 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 31,343 psi | 55% | 1693 fps | 95.7% |
| IMR 4227 | <<locked>> | 80% | 30,240 psi | 53% | 1634 fps | 97.2% |
| Lovex D060 | 14.6 gr | 80% | 38,580 psi | 67% | 1765 fps | 97.8% |
| Lovex D063 | <<locked>> | 80% | 42,627 psi | 74% | 1821 fps | 98.7% |
| Lovex S040 | <<locked>> | 80% | 47,935 psi | 83% | 1785 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 28,485 psi | 50% | 1614 fps | 99.3% |
| Norma 200 | <<locked>> | 94% | 30,603 psi | 53% | 1739 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,622 psi | 31% | 1001 fps | 100% |
| ReloadSwiss RS 36 | 15.2 gr | 80% | 28,413 psi | 49% | 1637 fps | 96.3% |
| Shooters World Blackout | <<locked>> | 80% | 42,627 psi | 74% | 1821 fps | 98.7% |
| Shooters World Buffalo Rifle | 14.6 gr | 80% | 38,580 psi | 67% | 1765 fps | 97.8% |
| Shooters World SOCOM | <<locked>> | 80% | 37,681 psi | 66% | 1745 fps | 98.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,064 psi | 47% | 1516 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 33,562 psi | 58% | 1654 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 22,321 psi | 39% | 1535 fps | 96.6% |
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 25 powders for .300 HAM'R loaded with the .308 | 155gr | Norma GTX. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,929 fps; across all powders the maximum-charge window runs from 1,109 fps to 1,929 fps. ADI AR 2207 gives the best case fill at 100 %, and 25 of the 25 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (396 MPa), the top charges use 44–89 %, leaving at least 11 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-10x, 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. ReloadSwiss RS 36, Shooters World Buffalo Rifle, Lovex D060 rank at the top here: for .300 HAM'R with the .308 | 155gr | Norma GTX 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.