Load Specifications
Load data in caliber .300 HAM'R with .308 | 135gr | Sierra SP SSPistol bullet and 23 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>> | 96% | 48,124 psi | 84% | 2090 fps | 98.2% |
| Accurate 5744 | <<locked>> | 82% | 49,792 psi | 87% | 2119 fps | 99.1% |
| Accurate No. 11 FS | <<locked>> | 86% | 51,430 psi | 89% | 2116 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 49,879 psi | 87% | 2028 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 44,454 psi | 77% | 2116 fps | 99.9% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 47,442 psi | 83% | 2126 fps | 98.7% |
| Hodgdon LilGun | <<locked>> | 82% | 51,706 psi | 90% | 2123 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,238 psi | 47% | 1243 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,611 psi | 71% | 2031 fps | 97.8% |
| IMR 4227 | <<locked>> | 96% | 51,866 psi | 90% | 2129 fps | 99.9% |
| Lovex D060 | <<locked>> | 88% | 49,792 psi | 87% | 2119 fps | 99.1% |
| Lovex D063 | <<locked>> | 84% | 49,284 psi | 86% | 2103 fps | 99.1% |
| Lovex S040 | <<locked>> | 82% | 51,692 psi | 90% | 2028 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 51,401 psi | 89% | 2116 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 39,073 psi | 68% | 2060 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,454 psi | 44% | 1263 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 49,690 psi | 86% | 2142 fps | 99.8% |
| Shooters World Blackout | <<locked>> | 84% | 49,284 psi | 86% | 2103 fps | 99.1% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 49,792 psi | 87% | 2119 fps | 99.1% |
| Shooters World SOCOM | <<locked>> | 88% | 50,894 psi | 89% | 2110 fps | 99.6% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 49,545 psi | 86% | 1982 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 51,169 psi | 89% | 2054 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,947 psi | 78% | 2093 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>> | 88% | 36,245 psi | 63% | 1923 fps | 95.5% |
| Accurate 5744 | <<locked>> | 80% | 46,195 psi | 80% | 2070 fps | 98.7% |
| Accurate No. 11 FS | <<locked>> | 80% | 41,379 psi | 72% | 1988 fps | 99.8% |
| ADI AR 2205 | <<locked>> | 80% | 38,334 psi | 67% | 1883 fps | 100% |
| ADI AR 2207 | <<locked>> | 82% | 23,728 psi | 41% | 1749 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 90% | 33,344 psi | 58% | 1913 fps | 95.4% |
| Hodgdon LilGun | <<locked>> | 80% | 47,659 psi | 83% | 2080 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,521 psi | 32% | 1093 fps | 100% |
| IMR 4198 | <<locked>> | 94% | 33,736 psi | 59% | 1913 fps | 95.8% |
| IMR 4227 | <<locked>> | 80% | 30,371 psi | 53% | 1808 fps | 96.4% |
| Lovex D060 | 16.8 gr | 80% | 39,030 psi | 68% | 1962 fps | 97.3% |
| Lovex D063 | <<locked>> | 80% | 42,859 psi | 75% | 2018 fps | 98.2% |
| Lovex S040 | <<locked>> | 80% | 48,486 psi | 84% | 1991 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 28,848 psi | 50% | 1788 fps | 98.9% |
| Norma 200 | <<locked>> | 94% | 31,328 psi | 54% | 1926 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,622 psi | 31% | 1119 fps | 100% |
| ReloadSwiss RS 36 | 17.4 gr | 80% | 28,427 psi | 49% | 1808 fps | 95.5% |
| Shooters World Blackout | <<locked>> | 80% | 42,859 psi | 75% | 2018 fps | 98.2% |
| Shooters World Buffalo Rifle | 16.8 gr | 80% | 39,030 psi | 68% | 1962 fps | 97.3% |
| Shooters World SOCOM | <<locked>> | 80% | 37,898 psi | 66% | 1932 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 27,253 psi | 47% | 1683 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 34,606 psi | 60% | 1850 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 22,684 psi | 39% | 1703 fps | 95.8% |
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 23 powders for .300 HAM'R loaded with the .308 | 135gr | Sierra SP SSPistol. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,142 fps; across all powders the maximum-charge window runs from 1,243 fps to 2,142 fps. ADI AR 2207 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (396 MPa), the top charges use 44–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Alliant Reloder-7, Hodgdon TrailBoss 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 | 135gr | Sierra SP SSPistol 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.