Load Specifications
Load data in caliber .32 H&R Mag. with .312 | 75gr | Lehigh Defense Xtreme Defense bullet and 15 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 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 64% | 17,332 psi | 85% | 1086 fps | 96.9% |
| Alliant BE-86² | <<locked>> | 64% | 17,883 psi | 88% | 1099 fps | 98.9% |
| Alliant Herco*² | <<locked>> | 76% | 17,042 psi | 84% | 1096 fps | 90.5% |
| Alliant UNIQUE*² | <<locked>> | 64% | 17,390 psi | 86% | 1112 fps | 90.8% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,549 psi | 82% | 1060 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,575 psi | 62% | 915 fps | 99.9% |
| Maxam CSB 1² | <<locked>> | 68% | 18,275 psi | 90% | 1102 fps | 97.6% |
| Maxam CSB 2² | <<locked>> | 64% | 17,129 psi | 84% | 1106 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,705 psi | 58% | 906 fps | 97.2% |
| ReloadSwiss RS 20*² | <<locked>> | 68% | 16,882 psi | 83% | 1119 fps | 92.7% |
| SNPE Vectan A0*² | <<locked>> | 68% | 18,188 psi | 90% | 1099 fps | 91.6% |
| Somchem MS200*² | <<locked>> | 64% | 18,130 psi | 89% | 1109 fps | 92.9% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,911 psi | 83% | 1017 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 64% | 17,608 psi | 87% | 1102 fps | 91.5% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,202 psi | 85% | 1086 fps | 95.7% |
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% | 15,780 psi | 78% | 1043 fps | 95.7% |
| Alliant BE-86² | <<locked>> | 60% | 15,795 psi | 78% | 1043 fps | 97.8% |
| Alliant Herco*² | <<locked>> | 64% | 12,995 psi | 64% | 974 fps | 85.5% |
| Alliant UNIQUE*² | <<locked>> | 60% | 15,316 psi | 75% | 1050 fps | 88.5% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,124 psi | 55% | 902 fps | 97.1% |
| Hodgdon TrailBoss*² | 2 gr | 60% | 6,483 psi | 32% | 673 fps | 93.5% |
| Maxam CSB 1*² | <<locked>> | 60% | 14,547 psi | 72% | 1004 fps | 94.7% |
| Maxam CSB 2² | <<locked>> | 60% | 14,852 psi | 73% | 1043 fps | 98.9% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 6,121 psi | 30% | 656 fps | 87.3% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,648 psi | 67% | 1020 fps | 88.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,692 psi | 72% | 1004 fps | 87.8% |
| Somchem MS200*² | <<locked>> | 60% | 16,621 psi | 82% | 1066 fps | 91.4% |
| Vihtavuori N32C Tin Star² | 2.7 gr | 60% | 9,848 psi | 49% | 827 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,432 psi | 76% | 1043 fps | 89.2% |
| Winchester AutoComp *² | <<locked>> | 60% | 15,229 psi | 75% | 1030 fps | 93.9% |
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 15 powders for .32 H&R Mag. loaded with the .312 | 75gr | Lehigh Defense Xtreme Defense. ReloadSwiss RS 20 delivers the highest muzzle velocity at 1,119 fps; across all powders the maximum-charge window runs from 906 fps to 1,119 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 15 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (140 MPa), the top charges use 58–90 %, 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 rank at the top here: for .32 H&R Mag. with the .312 | 75gr | Lehigh Defense Xtreme Defense they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Herco, Alliant UNIQUE, ReloadSwiss RS 20 burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1250, Alliant BE-86, Alliant Herco 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.