Load Specifications
Load data in caliber .260 Picra with .264 | 140gr | Speer Grand Slam bullet and 25 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N32C Tin Star, 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 ≥ 60% and propellant combustion ≥ 80%. 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: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS² | <<locked>> | 64% | 47,297 psi | 84% | 1391 fps | 96.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 48,762 psi | 86% | 1198 fps | 100% |
| ADI AP 100² | <<locked>> | 64% | 47,094 psi | 83% | 1293 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 48,718 psi | 86% | 1165 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 49,603 psi | 88% | 1184 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 49,995 psi | 88% | 1198 fps | 100% |
| Alliant Green Dot² | <<locked>> | 64% | 49,821 psi | 88% | 1214 fps | 100% |
| Alliant Herco² | <<locked>> | 68% | 47,340 psi | 84% | 1234 fps | 100% |
| Alliant RED DOT² | <<locked>> | 68% | 49,647 psi | 88% | 1204 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 48,689 psi | 86% | 1188 fps | 100% |
| Hodgdon Clays | <<locked>> | 80% | 49,327 psi | 87% | 1178 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 61% | 1014 fps | 100% |
| IMR 4227*² | <<locked>> | 72% | 47,152 psi | 83% | 1394 fps | 94.8% |
| Maxam CSB 1² | <<locked>> | 64% | 48,356 psi | 85% | 1211 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 49,429 psi | 87% | 1211 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 50,009 psi | 88% | 1211 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 49,908 psi | 88% | 1194 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,795 psi | 62% | 1033 fps | 100% |
| ReloadSwiss RS 30² | <<locked>> | 72% | 48,095 psi | 85% | 1398 fps | 99.7% |
| SNPE Vectan A0² | <<locked>> | 64% | 51,126 psi | 90% | 1260 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 68% | 50,140 psi | 89% | 1188 fps | 100% |
| SNPE Vectan BA6 1/2² | <<locked>> | 76% | 47,863 psi | 85% | 1362 fps | 100% |
| Somchem S265² | <<locked>> | 68% | 45,687 psi | 81% | 1365 fps | 97.8% |
| Vihtavuori N110² | <<locked>> | 68% | 47,442 psi | 84% | 1371 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 48,457 psi | 86% | 1155 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS*² | <<locked>> | 60% | 41,031 psi | 73% | 1309 fps | 94.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 44,788 psi | 79% | 1158 fps | 100% |
| ADI AP 100² | <<locked>> | 60% | 42,366 psi | 75% | 1240 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 38,928 psi | 69% | 1060 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 38,740 psi | 68% | 1066 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 42,105 psi | 74% | 1115 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 45,252 psi | 80% | 1168 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 39,479 psi | 70% | 1148 fps | 100% |
| Alliant RED DOT² | <<locked>> | 60% | 42,163 psi | 75% | 1122 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 34,142 psi | 60% | 1030 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 33,924 psi | 60% | 1007 fps | 100% |
| Hodgdon TrailBoss² | 6.6 gr | 60% | 17,811 psi | 31% | 768 fps | 100% |
| IMR 4227*² | <<locked>> | 60% | 31,966 psi | 57% | 1175 fps | 87.3% |
| Maxam CSB 1² | <<locked>> | 60% | 43,932 psi | 78% | 1165 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 45,484 psi | 80% | 1171 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 45,992 psi | 81% | 1168 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 45,339 psi | 80% | 1145 fps | 100% |
| ReloadSwiss RS 14² | 6.7 gr | 60% | 17,825 psi | 32% | 781 fps | 100% |
| ReloadSwiss RS 30² | <<locked>> | 60% | 32,721 psi | 58% | 1188 fps | 95.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 46,644 psi | 82% | 1217 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 42,757 psi | 76% | 1112 fps | 100% |
| SNPE Vectan BA6 1/2² | <<locked>> | 60% | 30,356 psi | 54% | 1129 fps | 99% |
| Somchem S265*² | <<locked>> | 60% | 35,781 psi | 63% | 1224 fps | 94.5% |
| Vihtavuori N110² | <<locked>> | 60% | 37,173 psi | 66% | 1240 fps | 99.2% |
| Vihtavuori N32C Tin Star² | 8.9 gr | 60% | 27,064 psi | 48% | 906 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 25 powders for .260 Picra loaded with the .264 | 140gr | Speer Grand Slam. ReloadSwiss RS 30 delivers the highest muzzle velocity at 1,398 fps; across all powders the maximum-charge window runs from 1,014 fps to 1,398 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 25 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 61–90 %, 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. Hodgdon TrailBoss, ReloadSwiss RS 14 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. Vihtavuori N32C Tin Star, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .260 Picra with the .264 | 140gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 4227 burn incompletely and react more sensitively to barrel length and temperature. ADI APS 350, ADI APS 450, ADI AS 30 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.