Load Specifications
Load data in caliber .32 H&R Mag. with .309 | 71gr | H&N RN HS bullet and 19 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.
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Max Load - Barrel Length: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 64% | 16,389 psi | 81% | 1129 fps | 96% |
| Alliant BE-86² | <<locked>> | 64% | 16,810 psi | 83% | 1142 fps | 98.3% |
| Alliant Herco* | <<locked>> | 80% | 17,680 psi | 87% | 1184 fps | 90.9% |
| Alliant UNIQUE*² | <<locked>> | 68% | 17,651 psi | 87% | 1188 fps | 90.7% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,405 psi | 86% | 1145 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 18,086 psi | 89% | 1178 fps | 96.8% |
| Hodgdon Clays² | <<locked>> | 64% | 18,260 psi | 90% | 1073 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,255 psi | 55% | 945 fps | 99.2% |
| Maxam CSB 1² | <<locked>> | 68% | 17,056 psi | 84% | 1142 fps | 96.7% |
| Maxam CSB 2² | <<locked>> | 68% | 17,695 psi | 87% | 1188 fps | 99.7% |
| Maxam CSB 3² | <<locked>> | 64% | 17,767 psi | 88% | 1152 fps | 99.5% |
| ReloadSwiss RS 14*ᴾ | <<locked>> | 100% | 9,369 psi | 46% | 896 fps | 93.4% |
| ReloadSwiss RS 20*² | <<locked>> | 72% | 18,028 psi | 89% | 1220 fps | 93.7% |
| SNPE Vectan A0*² | <<locked>> | 68% | 17,593 psi | 87% | 1155 fps | 90.9% |
| Somchem MS200*² | <<locked>> | 64% | 17,347 psi | 85% | 1158 fps | 91.9% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 18,260 psi | 90% | 1119 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 18,014 psi | 89% | 1198 fps | 98.2% |
| Vihtavuori N340*² | <<locked>> | 64% | 16,027 psi | 79% | 1129 fps | 89.6% |
| Winchester AutoComp ² | <<locked>> | 68% | 17,709 psi | 87% | 1168 fps | 95.9% |
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 1250*² | <<locked>> | 60% | 14,243 psi | 70% | 1066 fps | 94% |
| Alliant BE-86² | <<locked>> | 60% | 14,852 psi | 73% | 1086 fps | 96.9% |
| Alliant Herco*² | <<locked>> | 72% | 14,141 psi | 70% | 1079 fps | 86.6% |
| Alliant UNIQUE*² | <<locked>> | 60% | 13,721 psi | 68% | 1070 fps | 85.8% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 60% | 9,297 psi | 46% | 899 fps | 93.8% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 15,954 psi | 79% | 1119 fps | 95.1% |
| Hodgdon Clays² | <<locked>> | 60% | 16,520 psi | 81% | 1037 fps | 100% |
| Hodgdon TrailBoss*² | 2.5 gr | 64% | 5,105 psi | 25% | 676 fps | 87.3% |
| Maxam CSB 1*² | <<locked>> | 60% | 13,619 psi | 67% | 1040 fps | 93.3% |
| Maxam CSB 2² | <<locked>> | 60% | 13,329 psi | 66% | 1066 fps | 97.4% |
| Maxam CSB 3² | <<locked>> | 60% | 16,215 psi | 80% | 1112 fps | 98.9% |
| ReloadSwiss RS 14* | <<locked>> | 80% | 6,541 psi | 32% | 764 fps | 86.4% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 12,328 psi | 61% | 1040 fps | 85.8% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,735 psi | 68% | 1040 fps | 86.2% |
| Somchem MS200*² | <<locked>> | 60% | 15,302 psi | 75% | 1102 fps | 89.8% |
| Vihtavuori N32C Tin Star² | 3.1 gr | 60% | 7,760 psi | 38% | 820 fps | 98.6% |
| Vihtavuori N330² | <<locked>> | 60% | 15,693 psi | 77% | 1135 fps | 96.7% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,054 psi | 69% | 1070 fps | 87.1% |
| Winchester AutoComp *² | <<locked>> | 60% | 13,460 psi | 66% | 1047 fps | 91.5% |
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 3 powders for .32 H&R Mag. loaded with the .309 | 71gr | H&N RN HS. Vihtavuori N32C Tin Star delivers the highest muzzle velocity at 1,119 fps; across all powders the maximum-charge window runs from 896 fps to 1,119 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 3 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (140 MPa), the top charges use 46–90 %, 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 .309 | 71gr | H&N RN HS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ReloadSwiss RS 14 burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.