Load Specifications
Load data in caliber .32 Rem. with .321 | 170gr | Rim Rock RNFP Cowboy bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-10x, Alliant AR-Comp 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: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 38,072 psi | 89% | 2162 fps | 98.7% |
| Accurate 2015 | <<locked>> | 98% | 38,537 psi | 90% | 2251 fps | 98% |
| Accurate LT-30 | <<locked>> | 86% | 36,854 psi | 86% | 2123 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 86% | 37,652 psi | 88% | 2218 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 38,305 psi | 90% | 2267 fps | 96.1% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 38,218 psi | 89% | 2316 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 92% | 37,333 psi | 87% | 2241 fps | 98.7% |
| Alliant Reloder-7 | <<locked>> | 84% | 36,883 psi | 86% | 2175 fps | 98.9% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 36,999 psi | 86% | 2152 fps | 96.3% |
| Hodgdon H4198 | <<locked>> | 84% | 38,624 psi | 90% | 2165 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,356 psi | 71% | 1404 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 36,347 psi | 85% | 2283 fps | 96.4% |
| IMR 4198 | <<locked>> | 90% | 38,145 psi | 89% | 2205 fps | 99.4% |
| Norma 200 | <<locked>> | 88% | 37,014 psi | 87% | 2228 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,805 psi | 70% | 1437 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 37,463 psi | 88% | 2001 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 36,347 psi | 85% | 2205 fps | 96.7% |
| Vihtavuori N120 | <<locked>> | 86% | 37,942 psi | 89% | 2185 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 38,508 psi | 90% | 2208 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 98% | 37,710 psi | 88% | 2198 fps | 97.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 32,387 psi | 76% | 2182 fps | 96.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 80% | 35,636 psi | 83% | 2116 fps | 98.2% |
| Accurate 2015 | <<locked>> | 90% | 29,718 psi | 69% | 2083 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 84% | 34,809 psi | 81% | 2087 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 31,024 psi | 73% | 2096 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 88% | 35,853 psi | 84% | 2218 fps | 95.3% |
| Alliant AR-Comp | 28.7 gr | 86% | 24,540 psi | 57% | 1998 fps | 95.3% |
| Alliant Reloder-10x | 26.6 gr | 82% | 26,803 psi | 63% | 2021 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 32,474 psi | 76% | 2090 fps | 98% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 34,751 psi | 81% | 2113 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 82% | 36,143 psi | 84% | 2119 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,118 psi | 52% | 1253 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 33,997 psi | 79% | 2234 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 28,282 psi | 66% | 1998 fps | 96.9% |
| Norma 200 | 27 gr | 80% | 28,297 psi | 66% | 2051 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,785 psi | 51% | 1283 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 35,302 psi | 83% | 1969 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 32,039 psi | 75% | 2116 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 31,343 psi | 73% | 2070 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 28,224 psi | 66% | 2005 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 92% | 31,502 psi | 74% | 2080 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 98% | 30,240 psi | 71% | 2133 fps | 95.6% |
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 21 powders for .32 Rem. loaded with the .321 | 170gr | Rim Rock RNFP Cowboy. Alliant AR-Comp delivers the highest muzzle velocity at 2,316 fps; across all powders the maximum-charge window runs from 1,404 fps to 2,316 fps. Alliant AR-Comp gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (295 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. Alliant AR-Comp, Hodgdon TrailBoss, IMR 3031 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. Alliant Reloder-10x, Alliant AR-Comp, Norma 200 rank at the top here: for .32 Rem. with the .321 | 170gr | Rim Rock RNFP Cowboy 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.