Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Alaska Bullet Works Kodiak PP SPBC bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N555, Alliant Reloder-16 and Accurate 4350.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4350 | <<locked>> | 88% | 34,824 psi | 86% | 2247 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,592 psi | 88% | 2260 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 84% | 35,041 psi | 86% | 2277 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,216 psi | 89% | 2310 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 36,666 psi | 90% | 2254 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 87% | 1473 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 34,737 psi | 86% | 2228 fps | 96.8% |
| Norma URP | <<locked>> | 88% | 35,331 psi | 87% | 2247 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 88% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 34,911 psi | 86% | 2283 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,751 psi | 86% | 2264 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 82% | 35,186 psi | 87% | 2201 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,172 psi | 89% | 2247 fps | 98.2% |
| Somchem S355 | <<locked>> | 82% | 36,318 psi | 89% | 2211 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 35,897 psi | 88% | 2300 fps | 99.6% |
| Unknown powder | <<locked>> | 86% | 36,303 psi | 89% | 2251 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 86% | 35,085 psi | 86% | 2169 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,187 psi | 89% | 2228 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,695 psi | 90% | 2270 fps | 97% |
| Vihtavuori N555 | <<locked>> | 98% | 36,666 psi | 90% | 2329 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,780 psi | 86% | 2185 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,372 psi | 80% | 2306 fps | 98.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4350 | 35.2 gr | 84% | 30,560 psi | 75% | 2152 fps | 95.2% |
| Alliant Reloder-16 | 34.2 gr | 84% | 31,415 psi | 77% | 2162 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,661 psi | 76% | 2175 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,689 psi | 71% | 2129 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,050 psi | 67% | 2031 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 65% | 1316 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 30,676 psi | 76% | 2139 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 31,256 psi | 77% | 2156 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,600 psi | 66% | 1345 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,648 psi | 80% | 2234 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,489 psi | 80% | 2215 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,054 psi | 81% | 2156 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,098 psi | 84% | 2205 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 34,171 psi | 84% | 2165 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 24,642 psi | 61% | 2018 fps | 95.7% |
| Unknown powder | <<locked>> | 84% | 34,142 psi | 84% | 2208 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,095 psi | 72% | 2041 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 82% | 31,778 psi | 78% | 2136 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 82% | 32,213 psi | 79% | 2175 fps | 95.4% |
| Vihtavuori N555 | 36.9 gr | 90% | 28,485 psi | 70% | 2146 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,674 psi | 71% | 2044 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,601 psi | 70% | 2195 fps | 96.3% |
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 47 powders for 7 x 72 R loaded with the .284 | 175gr | Alaska Bullet Works Kodiak PP SPBC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,333 fps; across all powders the maximum-charge window runs from 1,473 fps to 2,333 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Hodgdon TrailBoss 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 N555, Alliant Reloder-16, Accurate 4350 rank at the top here: for 7 x 72 R with the .284 | 175gr | Alaska Bullet Works Kodiak PP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-22, Alliant Reloder-25 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.