Load Specifications
Load data in caliber 6.5 x 52 R K&S with .264 | 140gr | Speer Grand Slam bullet and 44 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 70 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% | 42,453 psi | 90% | 2356 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 42,482 psi | 90% | 2392 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,017 psi | 87% | 2438 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 41,742 psi | 89% | 2365 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,858 psi | 89% | 2487 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,220 psi | 87% | 2385 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 41,437 psi | 88% | 2395 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,959 psi | 87% | 2451 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,654 psi | 86% | 2470 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,043 psi | 79% | 2402 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,872 psi | 87% | 2536 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 41,046 psi | 87% | 2395 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 41,814 psi | 89% | 2395 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 42,467 psi | 90% | 2438 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,032 psi | 89% | 2438 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 75% | 1545 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,046 psi | 87% | 2346 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 41,989 psi | 89% | 2441 fps | 98.1% |
| IMR 4895 | <<locked>> | 82% | 42,424 psi | 90% | 2421 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 41,002 psi | 87% | 2352 fps | 99.5% |
| Lovex S065 | <<locked>> | 88% | 40,321 psi | 86% | 2343 fps | 96.1% |
| Norma 203B | <<locked>> | 82% | 40,756 psi | 86% | 2382 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 41,046 psi | 87% | 2434 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 82% | 40,408 psi | 86% | 2398 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,781 psi | 76% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,279 psi | 90% | 2379 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 40,596 psi | 86% | 2477 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,683 psi | 86% | 2454 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,944 psi | 87% | 2467 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 86% | 40,886 psi | 87% | 2385 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,321 psi | 86% | 2343 fps | 96.1% |
| Shooters World Precision | <<locked>> | 82% | 41,002 psi | 87% | 2352 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,264 psi | 90% | 2438 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,321 psi | 88% | 2287 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 41,916 psi | 89% | 2392 fps | 99.2% |
| Somchem S365 | <<locked>> | 96% | 41,655 psi | 88% | 2487 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 42,221 psi | 90% | 2346 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 42,612 psi | 90% | 2379 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 40,292 psi | 85% | 2385 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 82% | 41,278 psi | 88% | 2346 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 42,424 psi | 90% | 2441 fps | 97.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,089 psi | 85% | 2470 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,582 psi | 86% | 2372 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,083 psi | 70% | 2392 fps | 97.9% |
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% | 39,610 psi | 84% | 2310 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,478 psi | 80% | 2303 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,431 psi | 71% | 2287 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,883 psi | 78% | 2270 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,189 psi | 83% | 2431 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,405 psi | 77% | 2293 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,088 psi | 83% | 2349 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,953 psi | 72% | 2297 fps | 95.7% |
| Alliant Reloder-17 | 32.3 gr | 80% | 31,314 psi | 66% | 2260 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,138 psi | 62% | 2205 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,824 psi | 76% | 2425 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 35,752 psi | 76% | 2293 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 80% | 36,593 psi | 78% | 2293 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,385 psi | 62% | 2162 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,320 psi | 83% | 2385 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 56% | 1378 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,725 psi | 82% | 2303 fps | 97.9% |
| IMR 4831 | <<locked>> | 86% | 32,547 psi | 69% | 2251 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,045 psi | 85% | 2379 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 38,363 psi | 81% | 2303 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 38,101 psi | 81% | 2300 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 38,479 psi | 82% | 2339 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 33,837 psi | 72% | 2287 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,797 psi | 80% | 2349 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 57% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,668 psi | 84% | 2329 fps | 95.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,344 psi | 71% | 2320 fps | 99.3% |
| ReloadSwiss RS 62 | 34.7 gr | 86% | 33,344 psi | 71% | 2303 fps | 95% |
| ReloadSwiss RS 70 | 36.9 gr | 90% | 38,392 psi | 81% | 2415 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,591 psi | 71% | 2241 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,101 psi | 81% | 2300 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 38,363 psi | 81% | 2303 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,722 psi | 74% | 2290 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,347 psi | 77% | 2201 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,621 psi | 73% | 2251 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 25,092 psi | 53% | 2093 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 39,697 psi | 84% | 2303 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,764 psi | 70% | 2192 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 33,243 psi | 71% | 2241 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 38,667 psi | 82% | 2300 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,824 psi | 74% | 2290 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 31,111 psi | 66% | 2277 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,167 psi | 62% | 2123 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,153 psi | 62% | 2274 fps | 95.5% |
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 44 powders for 6.5 x 52 R K&S loaded with the .264 | 140gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,536 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,536 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.264" calls for a 1:12.0 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. Alliant Reloder-17, ReloadSwiss RS 70, ReloadSwiss RS 62 rank at the top here: for 6.5 x 52 R K&S with the .264 | 140gr | Speer Grand Slam 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.