Load Specifications
Load data in caliber 6.5 x 58 R with .264 | 126gr | Lehigh Defense Controlled Chaos bullet and 25 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4064, Accurate 2495 and Vihtavuori N140.
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 2015 | <<locked>> | 82% | 35,462 psi | 87% | 2182 fps | 99.7% |
| Accurate 2495 | <<locked>> | 90% | 35,636 psi | 88% | 2251 fps | 99.8% |
| Accurate 2520 | <<locked>> | 84% | 35,418 psi | 87% | 2241 fps | 97.4% |
| Accurate 4064 | <<locked>> | 92% | 35,447 psi | 87% | 2267 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 84% | 34,708 psi | 85% | 2241 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 36,216 psi | 89% | 2274 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,591 psi | 83% | 1463 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 35,201 psi | 87% | 2270 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 88% | 36,303 psi | 89% | 2270 fps | 97.6% |
| Lovex S062 | <<locked>> | 90% | 36,027 psi | 89% | 2231 fps | 95.7% |
| Norma 202 | <<locked>> | 86% | 35,679 psi | 88% | 2231 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,257 psi | 82% | 1490 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 36,274 psi | 89% | 2320 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 82% | 35,230 psi | 87% | 2182 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 36,303 psi | 89% | 2270 fps | 97.6% |
| Shooters World Precision | <<locked>> | 90% | 36,027 psi | 89% | 2231 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 35,853 psi | 88% | 2152 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 34,693 psi | 85% | 2149 fps | 98.6% |
| Somchem S321 | <<locked>> | 82% | 36,216 psi | 89% | 2238 fps | 95.9% |
| Somchem S335 | <<locked>> | 84% | 35,099 psi | 86% | 2156 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 35,563 psi | 88% | 2159 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 90% | 36,347 psi | 90% | 2251 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 88% | 35,926 psi | 88% | 2218 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 88% | 34,432 psi | 85% | 2205 fps | 97.5% |
| Winchester 748 | <<locked>> | 84% | 34,708 psi | 85% | 2241 fps | 96.1% |
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 2015 | <<locked>> | 80% | 33,083 psi | 81% | 2133 fps | 99.3% |
| Accurate 2495 | 22.2 gr | 80% | 25,556 psi | 63% | 2031 fps | 97.8% |
| Accurate 2520 | <<locked>> | 80% | 30,864 psi | 76% | 2146 fps | 95.9% |
| Accurate 4064 | 22.8 gr | 82% | 26,020 psi | 64% | 2054 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 30,501 psi | 75% | 2156 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 33,852 psi | 83% | 2228 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,497 psi | 60% | 1296 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 28,921 psi | 71% | 2129 fps | 97.8% |
| Lovex D073.6 | <<locked>> | 82% | 29,834 psi | 73% | 2133 fps | 95.4% |
| Lovex S062 | <<locked>> | 88% | 34,113 psi | 84% | 2192 fps | 95% |
| Norma 202 | <<locked>> | 80% | 29,443 psi | 73% | 2096 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,758 psi | 61% | 1332 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 34,040 psi | 84% | 2270 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 33,344 psi | 82% | 2139 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 29,834 psi | 73% | 2133 fps | 95.4% |
| Shooters World Precision | <<locked>> | 88% | 34,113 psi | 84% | 2192 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,952 psi | 79% | 2070 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 25,860 psi | 64% | 1952 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 33,881 psi | 83% | 2192 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 31,111 psi | 77% | 2073 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 80% | 31,720 psi | 78% | 2083 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 26,760 psi | 66% | 2044 fps | 98% |
| Vihtavuori N140 | 22.5 gr | 80% | 28,108 psi | 69% | 2047 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 82% | 28,631 psi | 71% | 2073 fps | 95.4% |
| Winchester 748 | <<locked>> | 82% | 32,851 psi | 81% | 2198 fps | 95.4% |
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 59 powders for 6.5 x 58 R loaded with the .264 | 126gr | Lehigh Defense Controlled Chaos. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,320 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,320 fps. Hodgdon Hybrid 100V gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 126.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Hodgdon Hybrid 100V, 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. Accurate 4064, Accurate 2495, Vihtavuori N140 rank at the top here: for 6.5 x 58 R with the .264 | 126gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2206H, ADI AR 2208, Alliant Reloder-15 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.