Load Specifications
Load data in caliber 6.5 x 58 R with .264 | 159gr | RWS TMR bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Hodgdon Hybrid 100V and Winchester 6.5 StaBALL.
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 4064 | <<locked>> | 82% | 35,955 psi | 89% | 2034 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 36,172 psi | 89% | 2100 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 82% | 35,868 psi | 88% | 2005 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,302 psi | 87% | 2028 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,085 psi | 86% | 2070 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,650 psi | 85% | 2090 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,475 psi | 82% | 2070 fps | 97.1% |
| Bofors RP3 | <<locked>> | 82% | 34,374 psi | 85% | 2024 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,158 psi | 89% | 2067 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,172 psi | 87% | 1342 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 35,128 psi | 87% | 2064 fps | 96.3% |
| Norma URP | <<locked>> | 90% | 34,722 psi | 86% | 2060 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 82% | 36,637 psi | 90% | 2073 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,534 psi | 88% | 1375 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 34,418 psi | 85% | 2093 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,419 psi | 90% | 2119 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 84% | 34,664 psi | 85% | 2021 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,766 psi | 88% | 2064 fps | 97.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,520 psi | 87% | 1946 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 35,636 psi | 88% | 2028 fps | 98.1% |
| Somchem S365 | <<locked>> | 94% | 35,172 psi | 87% | 2110 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 86% | 36,172 psi | 89% | 2018 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 90% | 36,434 psi | 90% | 2060 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 90% | 35,578 psi | 88% | 2064 fps | 95.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,592 psi | 88% | 2133 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,389 psi | 85% | 2005 fps | 97.6% |
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 4064 | <<locked>> | 80% | 33,736 psi | 83% | 1995 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 31,647 psi | 78% | 2011 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 33,707 psi | 83% | 1962 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,156 psi | 82% | 1985 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,054 psi | 81% | 2024 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 28,340 psi | 70% | 1942 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,747 psi | 73% | 1985 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 32,213 psi | 79% | 1982 fps | 97.7% |
| Hodgdon Hybrid 100V | 25.3 gr | 86% | 28,224 psi | 70% | 1900 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,991 psi | 64% | 1191 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 32,996 psi | 81% | 2021 fps | 95.5% |
| Norma URP | <<locked>> | 88% | 32,619 psi | 80% | 2018 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 34,127 psi | 84% | 2028 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 65% | 1224 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,182 psi | 74% | 1998 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 33,881 psi | 83% | 2070 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,443 psi | 75% | 1939 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,676 psi | 78% | 1982 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,286 psi | 82% | 1906 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 31,430 psi | 77% | 1942 fps | 96.8% |
| Somchem S365 | 25.4 gr | 84% | 25,672 psi | 63% | 1886 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,878 psi | 74% | 1896 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 88% | 34,272 psi | 84% | 2018 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 88% | 33,475 psi | 82% | 2024 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 31,430 psi | 77% | 2047 fps | 95.6% |
| Winchester 6.5 StaBALL | 26.9 gr | 82% | 28,631 psi | 71% | 1880 fps | 95.3% |
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 6.5 x 58 R loaded with the .264 | 159gr | RWS TMR. Vihtavuori N555 delivers the highest muzzle velocity at 2,133 fps; across all powders the maximum-charge window runs from 1,342 fps to 2,133 fps. Alliant Reloder-23 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 (280 MPa), the top charges use 82–90 %, leaving at least 10 % headroom. The 159.0 gr projectile in 0.264" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 6.5 x 58 R with the .264 | 159gr | RWS TMR 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.