Load Specifications
Load data in caliber 6.5 x 52 R K&S with .263 | 139gr | Prvi Partizan SP 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, ReloadSwiss RS 62 and Alliant Reloder-16.
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% | 40,640 psi | 86% | 2326 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 40,770 psi | 86% | 2362 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,742 psi | 89% | 2451 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 84% | 40,321 psi | 86% | 2336 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 40,190 psi | 85% | 2448 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 42,148 psi | 89% | 2398 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 82% | 39,856 psi | 85% | 2359 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,756 psi | 89% | 2457 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,843 psi | 89% | 2490 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,476 psi | 75% | 2359 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,073 psi | 83% | 2490 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 41,945 psi | 89% | 2408 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 40,350 psi | 86% | 2362 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 40,843 psi | 87% | 2405 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 40,509 psi | 86% | 2408 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,998 psi | 74% | 1529 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 42,322 psi | 90% | 2365 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 40,248 psi | 85% | 2405 fps | 97.4% |
| IMR 4895 | <<locked>> | 82% | 40,814 psi | 87% | 2388 fps | 98.6% |
| Lovex S062 | <<locked>> | 84% | 41,872 psi | 89% | 2365 fps | 99.5% |
| Lovex S065 | <<locked>> | 90% | 41,350 psi | 88% | 2356 fps | 96.1% |
| Norma 203B | <<locked>> | 84% | 42,003 psi | 89% | 2402 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 41,814 psi | 89% | 2444 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 84% | 41,423 psi | 88% | 2415 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,636 psi | 76% | 1572 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,626 psi | 88% | 2454 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,742 psi | 89% | 2493 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,495 psi | 88% | 2467 fps | 97.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,090 psi | 89% | 2480 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 82% | 41,292 psi | 88% | 2333 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 88% | 41,814 psi | 89% | 2398 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,350 psi | 88% | 2356 fps | 96.1% |
| Shooters World Precision | <<locked>> | 84% | 41,872 psi | 89% | 2365 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,567 psi | 86% | 2405 fps | 98.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 42,337 psi | 90% | 2300 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 40,103 psi | 85% | 2356 fps | 98.7% |
| Somchem S365 | <<locked>> | 98% | 42,525 psi | 90% | 2500 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 40,756 psi | 86% | 2320 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,408 psi | 88% | 2329 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 40,814 psi | 87% | 2346 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 92% | 41,408 psi | 88% | 2402 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 42,612 psi | 90% | 2369 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 40,437 psi | 86% | 2402 fps | 97% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,072 psi | 81% | 2428 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 41,640 psi | 88% | 2385 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,821 psi | 68% | 2346 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 42,235 psi | 90% | 2398 fps | 99.2% |
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% | 37,840 psi | 80% | 2280 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 35,781 psi | 76% | 2270 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,084 psi | 72% | 2300 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 35,491 psi | 75% | 2238 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,536 psi | 80% | 2388 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,838 psi | 74% | 2260 fps | 97.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,550 psi | 80% | 2316 fps | 97.3% |
| Alliant Reloder-16 | 31.9 gr | 88% | 34,751 psi | 74% | 2310 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,936 psi | 64% | 2218 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,618 psi | 67% | 2267 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,463 psi | 77% | 2431 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 34,258 psi | 73% | 2260 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 80% | 35,186 psi | 75% | 2260 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,936 psi | 64% | 2169 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,826 psi | 80% | 2356 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 55% | 1365 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,217 psi | 79% | 2267 fps | 97.2% |
| IMR 4831 | <<locked>> | 88% | 33,214 psi | 70% | 2260 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 38,421 psi | 82% | 2343 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 37,159 psi | 79% | 2277 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 39,001 psi | 83% | 2313 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 36,941 psi | 78% | 2306 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 34,606 psi | 73% | 2300 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 36,172 psi | 77% | 2313 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 56% | 1398 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,073 psi | 83% | 2405 fps | 97.7% |
| ReloadSwiss RS 60 | 31.2 gr | 80% | 31,850 psi | 68% | 2280 fps | 98.7% |
| ReloadSwiss RS 62 | 35.1 gr | 90% | 36,187 psi | 77% | 2362 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,334 psi | 83% | 2425 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 38,856 psi | 82% | 2290 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 32,401 psi | 69% | 2211 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,001 psi | 83% | 2313 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 37,159 psi | 79% | 2277 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,388 psi | 71% | 2257 fps | 96.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,201 psi | 75% | 2178 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 33,156 psi | 70% | 2215 fps | 97% |
| Somchem S365 | <<locked>> | 82% | 25,715 psi | 55% | 2110 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 38,261 psi | 81% | 2280 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,943 psi | 83% | 2287 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,647 psi | 67% | 2165 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 33,953 psi | 72% | 2251 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 37,260 psi | 79% | 2274 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 35,621 psi | 76% | 2306 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 31,473 psi | 67% | 2283 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,153 psi | 64% | 2142 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,820 psi | 63% | 2283 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,465 psi | 84% | 2349 fps | 98.7% |
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 SP BT. Somchem S365 delivers the highest muzzle velocity at 2,500 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,500 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 68–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.263" calls for a 1:10.5 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, ReloadSwiss RS 62, Alliant Reloder-16 rank at the top here: for 6.5 x 52 R K&S with the .263 | 139gr | Prvi Partizan SP 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.