Load Specifications
Load data in caliber .356 Win. with .357 | 158gr | Fiocchi SJSP bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and Norma 200.
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: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 90% | 44,817 psi | 86% | 2582 fps | 97% |
| ADI AR 2205 | <<locked>> | 82% | 45,658 psi | 88% | 2513 fps | 100% |
| ADI AR 2207 | <<locked>> | 96% | 45,643 psi | 88% | 2694 fps | 99.8% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 42,351 psi | 81% | 2654 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 94% | 45,295 psi | 87% | 2641 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,936 psi | 58% | 1640 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 45,585 psi | 88% | 2657 fps | 98.2% |
| IMR 4227 | <<locked>> | 88% | 45,005 psi | 87% | 2592 fps | 99.1% |
| Lovex D060 | <<locked>> | 82% | 45,629 psi | 88% | 2618 fps | 98% |
| Lovex S053 | <<locked>> | 90% | 45,774 psi | 88% | 2598 fps | 100% |
| Norma 200 | <<locked>> | 98% | 45,237 psi | 87% | 2694 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,457 psi | 57% | 1680 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 46,398 psi | 89% | 2654 fps | 99.2% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 45,629 psi | 88% | 2618 fps | 98% |
| Shooters World SOCOM | <<locked>> | 82% | 45,759 psi | 88% | 2592 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 92% | 44,701 psi | 86% | 2451 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 45,397 psi | 87% | 2526 fps | 100% |
| Vihtavuori N120 | <<locked>> | 96% | 45,919 psi | 88% | 2657 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 41,263 psi | 79% | 2566 fps | 96% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 86% | 39,392 psi | 76% | 2484 fps | 95.6% |
| ADI AR 2205 | <<locked>> | 80% | 42,946 psi | 83% | 2467 fps | 100% |
| ADI AR 2207 | 35 gr | 80% | 27,804 psi | 53% | 2310 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 96% | 37,579 psi | 72% | 2559 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 86% | 35,476 psi | 68% | 2448 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,799 psi | 42% | 1463 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 34,490 psi | 66% | 2428 fps | 95.1% |
| IMR 4227 | <<locked>> | 80% | 35,172 psi | 68% | 2398 fps | 97.2% |
| Lovex D060 | <<locked>> | 80% | 43,221 psi | 83% | 2572 fps | 97.5% |
| Lovex S053 | <<locked>> | 80% | 34,272 psi | 66% | 2379 fps | 99.4% |
| Norma 200 | 41.2 gr | 90% | 35,360 psi | 68% | 2500 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,350 psi | 41% | 1493 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 34,142 psi | 66% | 2415 fps | 96.7% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 43,221 psi | 83% | 2572 fps | 97.5% |
| Shooters World SOCOM | <<locked>> | 80% | 42,757 psi | 82% | 2539 fps | 98.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,474 psi | 62% | 2241 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 40,393 psi | 78% | 2448 fps | 100% |
| Vihtavuori N120 | 35 gr | 80% | 28,152 psi | 54% | 2293 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 98% | 38,812 psi | 75% | 2516 fps | 95.3% |
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 19 powders for .356 Win. loaded with the .357 | 158gr | Fiocchi SJSP. ADI AR 2207 delivers the highest muzzle velocity at 2,694 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,694 fps. Alliant Reloder-10x gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (359 MPa), the top charges use 57–89 %, leaving at least 11 % headroom. Alliant Reloder-10x, Hodgdon TrailBoss, IMR 4198 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. ADI AR 2207, Vihtavuori N120, Norma 200 rank at the top here: for .356 Win. with the .357 | 158gr | Fiocchi SJSP 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.