Load Specifications
Load data in caliber 6.5 x 52 R K&S with .264 | 155gr | Lapua Mega bullet and 42 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Somchem S365 and ReloadSwiss RS 70.
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 3100ᴾ | <<locked>> | 100% | 40,292 psi | 85% | 2283 fps | 96.8% |
| Accurate 4064 | <<locked>> | 82% | 41,655 psi | 88% | 2241 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 40,161 psi | 85% | 2290 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 82% | 40,625 psi | 86% | 2215 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 40,335 psi | 86% | 2238 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,540 psi | 90% | 2349 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,511 psi | 90% | 2372 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,740 psi | 82% | 2310 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,234 psi | 85% | 2398 fps | 98.2% |
| Bofors RP3 | <<locked>> | 82% | 39,958 psi | 85% | 2244 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 82% | 41,046 psi | 87% | 2251 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 88% | 40,509 psi | 86% | 2293 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,872 psi | 89% | 2293 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 75% | 1450 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,612 psi | 90% | 2247 fps | 96.1% |
| IMR 4831 | <<locked>> | 92% | 41,524 psi | 88% | 2300 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 42,018 psi | 89% | 2247 fps | 97.5% |
| Lovex S070 | <<locked>> | 90% | 42,511 psi | 90% | 2274 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 42,656 psi | 90% | 2283 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 40,393 psi | 86% | 2293 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 82% | 42,395 psi | 90% | 2300 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 42,047 psi | 89% | 2329 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 77% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,263 psi | 88% | 2234 fps | 96.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,293 psi | 90% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 39,798 psi | 84% | 2310 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,972 psi | 85% | 2323 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 84% | 40,234 psi | 85% | 2241 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,018 psi | 89% | 2247 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 90% | 42,511 psi | 90% | 2274 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,118 psi | 87% | 2287 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 40,393 psi | 86% | 2139 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,568 psi | 88% | 2201 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 41,133 psi | 87% | 2244 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 40,973 psi | 87% | 2339 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 41,568 psi | 88% | 2228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 42,076 psi | 89% | 2287 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 90% | 41,597 psi | 88% | 2297 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,395 psi | 90% | 2375 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,206 psi | 90% | 2274 fps | 99.8% |
| Winchester 760 | <<locked>> | 88% | 40,509 psi | 86% | 2293 fps | 95.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,592 psi | 73% | 2320 fps | 99.4% |
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 3100 | <<locked>> | 96% | 35,433 psi | 75% | 2195 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 39,218 psi | 83% | 2201 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,705 psi | 65% | 2103 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,276 psi | 81% | 2172 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,971 psi | 81% | 2195 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,357 psi | 67% | 2116 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,619 psi | 69% | 2175 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,064 psi | 57% | 2037 fps | 95.4% |
| Alliant Reloder-26 | 36.4 gr | 92% | 32,735 psi | 69% | 2234 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 37,565 psi | 80% | 2198 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 80% | 38,319 psi | 81% | 2201 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 37,797 psi | 80% | 2241 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,021 psi | 57% | 1985 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 56% | 1293 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,190 psi | 85% | 2205 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 29,965 psi | 64% | 2070 fps | 95.3% |
| Lovex S065 | <<locked>> | 82% | 34,911 psi | 74% | 2113 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 37,463 psi | 79% | 2182 fps | 95% |
| Norma 203B | <<locked>> | 80% | 40,147 psi | 85% | 2241 fps | 99.2% |
| Norma URP | <<locked>> | 82% | 31,343 psi | 66% | 2106 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,552 psi | 84% | 2251 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 37,086 psi | 79% | 2234 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 57% | 1325 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,914 psi | 83% | 2192 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,693 psi | 74% | 2228 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,590 psi | 69% | 2165 fps | 95.9% |
| ReloadSwiss RS 70 | 33.7 gr | 86% | 34,954 psi | 74% | 2218 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,215 psi | 75% | 2149 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,911 psi | 74% | 2113 fps | 95.4% |
| Shooters World SW4350 | <<locked>> | 86% | 37,463 psi | 79% | 2182 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,129 psi | 77% | 2192 fps | 98.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,971 psi | 81% | 2100 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 38,754 psi | 82% | 2152 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 36,114 psi | 77% | 2156 fps | 98.8% |
| Somchem S365 | 29.3 gr | 80% | 26,266 psi | 56% | 2021 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 34,243 psi | 73% | 2100 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 30,676 psi | 65% | 2064 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 82% | 32,184 psi | 68% | 2113 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 28,964 psi | 61% | 2103 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,371 psi | 64% | 2044 fps | 97.4% |
| Winchester 760 | <<locked>> | 86% | 37,797 psi | 80% | 2241 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,992 psi | 57% | 2103 fps | 95.8% |
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 42 powders for 6.5 x 52 R K&S loaded with the .264 | 155gr | Lapua Mega. Alliant Reloder-26 delivers the highest muzzle velocity at 2,398 fps; across all powders the maximum-charge window runs from 1,450 fps to 2,398 fps. Accurate 3100 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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-26, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 6.5 x 52 R K&S with the .264 | 155gr | Lapua Mega 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.