Load Specifications
Load data in caliber 6.5 x 52 R K&S with .263 | 139gr | Prvi Partizan FMJ BT bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and ReloadSwiss RS 62.
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% | 40,030 psi | 85% | 2313 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 40,538 psi | 86% | 2356 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,191 psi | 87% | 2438 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 86% | 42,264 psi | 90% | 2369 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 40,059 psi | 85% | 2441 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 41,974 psi | 89% | 2395 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,148 psi | 89% | 2398 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,307 psi | 88% | 2448 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,408 psi | 88% | 2477 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,114 psi | 74% | 2349 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,725 psi | 82% | 2477 fps | 96.1% |
| Bofors RP3 | <<locked>> | 86% | 41,394 psi | 88% | 2395 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 84% | 39,871 psi | 85% | 2352 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 40,350 psi | 86% | 2392 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 40,001 psi | 85% | 2395 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,954 psi | 74% | 1526 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 41,800 psi | 89% | 2352 fps | 98.3% |
| IMR 4831 | <<locked>> | 96% | 42,308 psi | 90% | 2438 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 40,625 psi | 86% | 2382 fps | 98.5% |
| Lovex S062 | <<locked>> | 84% | 41,684 psi | 88% | 2359 fps | 99.4% |
| Lovex S065 | <<locked>> | 90% | 40,872 psi | 87% | 2346 fps | 95.9% |
| Norma 203B | <<locked>> | 84% | 41,466 psi | 88% | 2388 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 41,698 psi | 88% | 2438 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 84% | 41,249 psi | 88% | 2408 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 75% | 1568 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,408 psi | 88% | 2448 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,249 psi | 88% | 2484 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,075 psi | 87% | 2457 fps | 97.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,684 psi | 88% | 2470 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 82% | 41,060 psi | 87% | 2326 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 88% | 41,655 psi | 88% | 2395 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,872 psi | 87% | 2346 fps | 95.9% |
| Shooters World Precision | <<locked>> | 84% | 41,684 psi | 88% | 2359 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,089 psi | 85% | 2392 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 42,598 psi | 90% | 2385 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 41,800 psi | 89% | 2290 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 42,351 psi | 90% | 2395 fps | 99.1% |
| Somchem S365 | <<locked>> | 98% | 42,047 psi | 89% | 2487 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 40,524 psi | 86% | 2313 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,191 psi | 87% | 2323 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 40,669 psi | 86% | 2339 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 92% | 40,901 psi | 87% | 2388 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 42,076 psi | 89% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 40,016 psi | 85% | 2388 fps | 96.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,652 psi | 80% | 2418 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 41,278 psi | 88% | 2375 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,698 psi | 88% | 2388 fps | 99% |
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% | 37,579 psi | 80% | 2274 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 35,534 psi | 75% | 2264 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 33,562 psi | 71% | 2287 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 35,273 psi | 75% | 2231 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,391 psi | 79% | 2385 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,679 psi | 74% | 2251 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,376 psi | 79% | 2310 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,635 psi | 73% | 2303 fps | 95.4% |
| Alliant Reloder-17 | 31 gr | 80% | 29,805 psi | 63% | 2211 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,270 psi | 66% | 2254 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,143 psi | 77% | 2418 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 34,069 psi | 72% | 2254 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 80% | 35,012 psi | 74% | 2251 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,573 psi | 63% | 2159 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,652 psi | 80% | 2349 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 56% | 1368 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,014 psi | 79% | 2260 fps | 97.1% |
| IMR 4831 | <<locked>> | 90% | 34,824 psi | 74% | 2293 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 38,232 psi | 81% | 2336 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 36,941 psi | 78% | 2270 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 38,551 psi | 82% | 2300 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 36,738 psi | 78% | 2297 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 34,432 psi | 73% | 2293 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 36,027 psi | 76% | 2306 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,600 psi | 56% | 1401 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,508 psi | 82% | 2392 fps | 97.5% |
| ReloadSwiss RS 60 | 31 gr | 80% | 31,720 psi | 67% | 2274 fps | 98.6% |
| ReloadSwiss RS 62 | 34.8 gr | 90% | 35,795 psi | 76% | 2352 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,986 psi | 83% | 2415 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 38,682 psi | 82% | 2283 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 31,894 psi | 68% | 2198 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,551 psi | 82% | 2300 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 36,941 psi | 78% | 2270 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,953 psi | 70% | 2244 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,813 psi | 84% | 2336 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,983 psi | 74% | 2172 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 32,982 psi | 70% | 2208 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 27,137 psi | 58% | 2149 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 38,029 psi | 81% | 2274 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,435 psi | 82% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,198 psi | 66% | 2152 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 88% | 35,926 psi | 76% | 2293 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 37,072 psi | 79% | 2267 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 35,186 psi | 75% | 2293 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 94% | 31,357 psi | 67% | 2277 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,805 psi | 63% | 2129 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,291 psi | 83% | 2343 fps | 98.6% |
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 47 powders for 6.5 x 52 R K&S loaded with the .263 | 139gr | Prvi Partizan FMJ BT. Somchem S365 delivers the highest muzzle velocity at 2,487 fps; across all powders the maximum-charge window runs from 1,526 fps to 2,487 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.263" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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 60, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for 6.5 x 52 R K&S with the .263 | 139gr | Prvi Partizan FMJ BT 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.