Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Speer Grand Slam bullet and 23 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Vihtavuori N555 and Alliant Reloder-16.
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% | 34,998 psi | 86% | 2251 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,520 psi | 87% | 2260 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,954 psi | 86% | 2277 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,347 psi | 90% | 2313 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,114 psi | 86% | 2339 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,650 psi | 85% | 2215 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 87% | 1473 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 34,621 psi | 85% | 2224 fps | 96.8% |
| Norma URP | <<locked>> | 88% | 35,505 psi | 87% | 2251 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 88% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 35,056 psi | 86% | 2287 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,940 psi | 86% | 2267 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 35,346 psi | 87% | 2205 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,376 psi | 90% | 2251 fps | 98.2% |
| Somchem S355 | <<locked>> | 82% | 36,245 psi | 89% | 2208 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 36,100 psi | 89% | 2306 fps | 99.6% |
| Unknown powder | <<locked>> | 86% | 36,448 psi | 90% | 2257 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 86% | 35,012 psi | 86% | 2169 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,332 psi | 89% | 2231 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,579 psi | 90% | 2270 fps | 97% |
| Vihtavuori N555 | <<locked>> | 96% | 34,635 psi | 85% | 2290 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,911 psi | 86% | 2188 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,474 psi | 80% | 2310 fps | 98.4% |
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 | <<locked>> | 84% | 30,472 psi | 75% | 2152 fps | 95.2% |
| Alliant Reloder-16 | 34.3 gr | 84% | 31,546 psi | 78% | 2165 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,792 psi | 76% | 2178 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,587 psi | 70% | 2126 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 32,866 psi | 81% | 2283 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,151 psi | 67% | 2037 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 65% | 1316 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 30,603 psi | 75% | 2136 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 31,198 psi | 77% | 2156 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 65% | 1345 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,793 psi | 81% | 2238 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,619 psi | 80% | 2218 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,185 psi | 82% | 2162 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,982 psi | 84% | 2201 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 34,040 psi | 84% | 2165 fps | 98.1% |
| Somchem S365 | 33.4 gr | 80% | 24,772 psi | 61% | 2024 fps | 95.8% |
| Unknown powder | <<locked>> | 84% | 34,055 psi | 84% | 2205 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,008 psi | 71% | 2041 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 82% | 31,923 psi | 79% | 2139 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 82% | 32,140 psi | 79% | 2175 fps | 95.4% |
| Vihtavuori N555 | 37 gr | 90% | 28,631 psi | 71% | 2149 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,790 psi | 71% | 2047 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 26,963 psi | 66% | 2142 fps | 95% |
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 23 powders for 7 x 72 R loaded with the .284 | 175gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,339 fps; across all powders the maximum-charge window runs from 1,473 fps to 2,339 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 80–90 %, 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, 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. Somchem S365, Vihtavuori N555, Alliant Reloder-16 rank at the top here: for 7 x 72 R with the .284 | 175gr | Speer Grand Slam 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.