Load Specifications
Load data in caliber 6.5 x 52 R with .257 | 122gr | Remington SP Extended-Range bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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>> | 86% | 32,068 psi | 90% | 2178 fps | 99.5% |
| Accurate 4064 | <<locked>> | 88% | 32,068 psi | 90% | 2195 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 96% | 31,647 psi | 89% | 1430 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 31,459 psi | 89% | 2188 fps | 98.7% |
| Lovex D073.6 | <<locked>> | 82% | 30,530 psi | 86% | 2149 fps | 96% |
| Norma 202 | <<locked>> | 82% | 32,024 psi | 90% | 2152 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 96% | 31,865 psi | 90% | 1467 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 30,530 psi | 86% | 2149 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 31,459 psi | 89% | 2083 fps | 98% |
| Vihtavuori N135 | <<locked>> | 84% | 30,995 psi | 87% | 2142 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 82% | 30,211 psi | 85% | 2096 fps | 97% |
| Vihtavuori N540 | <<locked>> | 84% | 30,864 psi | 87% | 2126 fps | 96.6% |
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 2495 | <<locked>> | 80% | 26,092 psi | 73% | 2041 fps | 98.2% |
| Accurate 4064 | <<locked>> | 82% | 26,571 psi | 75% | 2064 fps | 95.7% |
| Hodgdon TrailBoss | 7.4 gr | 80% | 24,700 psi | 70% | 1299 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 29,631 psi | 83% | 2146 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 28,427 psi | 80% | 2100 fps | 95.1% |
| Norma 202 | <<locked>> | 80% | 30,226 psi | 85% | 2113 fps | 96.6% |
| ReloadSwiss RS 14 | 7.6 gr | 80% | 25,005 psi | 70% | 1339 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 28,427 psi | 80% | 2100 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,107 psi | 73% | 1955 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 27,122 psi | 76% | 2051 fps | 98.3% |
| Vihtavuori N140 | <<locked>> | 80% | 28,529 psi | 80% | 2054 fps | 96.3% |
| Vihtavuori N540 | <<locked>> | 80% | 27,282 psi | 77% | 2037 fps | 95% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 12 powders for 6.5 x 52 R loaded with the .257 | 122gr | Remington SP Extended-Range. Accurate 4064 delivers the highest muzzle velocity at 2,195 fps; across all powders the maximum-charge window runs from 1,430 fps to 2,195 fps. Hodgdon TrailBoss gives the best case fill at 96 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (245 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 122.0 gr projectile in 0.257" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6.5 x 52 R with the .257 | 122gr | Remington SP Extended-Range 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.