Load Specifications
Load data in caliber 6.5 x 58 R with .264 | 155gr | Lapua Mega bullet and 28 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Alliant Reloder-17 and Hodgdon Hybrid 100V.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 35,882 psi | 88% | 2024 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 36,158 psi | 89% | 2057 fps | 99.9% |
| Accurate 4350 | <<locked>> | 94% | 36,216 psi | 89% | 2116 fps | 96% |
| ADI AR 2208 | <<locked>> | 84% | 36,419 psi | 90% | 2028 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 36,172 psi | 89% | 2116 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,331 psi | 87% | 2044 fps | 97.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,158 psi | 89% | 2057 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,954 psi | 86% | 2106 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 34,693 psi | 85% | 2047 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,463 psi | 90% | 2083 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 36,114 psi | 89% | 2090 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 86% | 1342 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,824 psi | 88% | 2011 fps | 96.6% |
| Lovex S062 | <<locked>> | 82% | 35,636 psi | 88% | 2021 fps | 98.3% |
| Norma 203B | <<locked>> | 82% | 35,534 psi | 88% | 2051 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 82% | 34,635 psi | 85% | 2051 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,230 psi | 87% | 1378 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,012 psi | 86% | 2116 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 86% | 34,998 psi | 86% | 2044 fps | 97.7% |
| Shooters World Precision | <<locked>> | 82% | 35,636 psi | 88% | 2021 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 36,318 psi | 89% | 2087 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 36,056 psi | 89% | 1972 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 36,100 psi | 89% | 2051 fps | 97.7% |
| Somchem S365 | <<locked>> | 96% | 35,070 psi | 86% | 2119 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 36,318 psi | 89% | 2021 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 36,347 psi | 90% | 2037 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 35,940 psi | 89% | 2024 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,867 psi | 86% | 2021 fps | 97.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 33,562 psi | 83% | 1985 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 31,734 psi | 78% | 1975 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 33,823 psi | 83% | 2073 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 32,401 psi | 80% | 1949 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 33,953 psi | 84% | 2070 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,314 psi | 77% | 1965 fps | 96.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,924 psi | 84% | 2014 fps | 96% |
| Alliant Reloder-17 | 26.1 gr | 84% | 30,893 psi | 76% | 2018 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 30,385 psi | 75% | 1959 fps | 96.6% |
| Hodgdon Hybrid 100V | 25.8 gr | 90% | 30,458 psi | 75% | 1962 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,924 psi | 84% | 2047 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,904 psi | 64% | 1198 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,953 psi | 84% | 1975 fps | 96% |
| Lovex S062 | <<locked>> | 80% | 33,417 psi | 82% | 1978 fps | 97.8% |
| Norma 203B | <<locked>> | 80% | 33,301 psi | 82% | 2005 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 32,547 psi | 80% | 2008 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,904 psi | 64% | 1224 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,776 psi | 71% | 1975 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 80% | 28,660 psi | 71% | 1916 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 33,417 psi | 82% | 1978 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 31,763 psi | 78% | 1995 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,952 psi | 79% | 1900 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 29,733 psi | 73% | 1923 fps | 95.6% |
| Somchem S365 | 25.9 gr | 88% | 27,601 psi | 68% | 1949 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 34,301 psi | 84% | 1988 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,253 psi | 70% | 1880 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 80% | 33,750 psi | 83% | 1985 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 30,937 psi | 76% | 1942 fps | 95.6% |
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 28 powders for 6.5 x 58 R loaded with the .264 | 155gr | Lapua Mega. Somchem S365 delivers the highest muzzle velocity at 2,119 fps; across all powders the maximum-charge window runs from 1,342 fps to 2,119 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 28 of the 28 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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. Somchem S365, Alliant Reloder-17, Hodgdon Hybrid 100V rank at the top here: for 6.5 x 58 R with the .264 | 155gr | Lapua Mega they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.