Load Specifications
Load data in caliber .32 H&R Mag. with .310 | 85gr | Sellier & Bellot FMJ bullet and 13 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, Hodgdon TrailBoss and ReloadSwiss RS 14.
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: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 64% | 18,043 psi | 89% | 1037 fps | 98.6% |
| Alliant Herco*² | <<locked>> | 76% | 17,492 psi | 86% | 1050 fps | 93.2% |
| Alliant UNIQUE*² | <<locked>> | 64% | 17,941 psi | 88% | 1063 fps | 93.4% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 17,202 psi | 85% | 1010 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,662 psi | 62% | 866 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,476 psi | 81% | 994 fps | 97.8% |
| Maxam CSB 2² | <<locked>> | 64% | 16,926 psi | 83% | 1033 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,603 psi | 57% | 856 fps | 98.4% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 17,753 psi | 87% | 1079 fps | 95.7% |
| SNPE Vectan A0*² | <<locked>> | 64% | 17,376 psi | 86% | 1017 fps | 93% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 17,419 psi | 86% | 965 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 64% | 18,362 psi | 90% | 1056 fps | 94.3% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,027 psi | 84% | 1017 fps | 97.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 60% | 15,534 psi | 77% | 974 fps | 97.1% |
| Alliant Herco*² | <<locked>> | 60% | 11,502 psi | 57% | 873 fps | 85.4% |
| Alliant UNIQUE*² | <<locked>> | 60% | 15,621 psi | 77% | 1004 fps | 91.1% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,226 psi | 55% | 856 fps | 98.5% |
| Hodgdon TrailBoss*² | 2 gr | 60% | 6,034 psi | 30% | 627 fps | 93.9% |
| Maxam CSB 1² | <<locked>> | 60% | 14,939 psi | 74% | 955 fps | 96.7% |
| Maxam CSB 2² | <<locked>> | 60% | 15,287 psi | 75% | 994 fps | 99.8% |
| ReloadSwiss RS 14*² | 2 gr | 60% | 5,555 psi | 27% | 607 fps | 87.4% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 14,083 psi | 69% | 981 fps | 91.8% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,142 psi | 75% | 961 fps | 90.7% |
| Vihtavuori N32C Tin Star² | 2.7 gr | 60% | 9,718 psi | 48% | 778 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,969 psi | 79% | 1001 fps | 92.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,606 psi | 77% | 984 fps | 96.1% |
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 13 powders for .32 H&R Mag. loaded with the .310 | 85gr | Sellier & Bellot FMJ. ReloadSwiss RS 20 delivers the highest muzzle velocity at 1,079 fps; across all powders the maximum-charge window runs from 856 fps to 1,079 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 13 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (140 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. 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, Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for .32 H&R Mag. with the .310 | 85gr | Sellier & Bellot FMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Herco, Alliant UNIQUE, SNPE Vectan A0 burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1250, Alliant Herco, Alliant UNIQUE 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.