Load Specifications
Load data in caliber 7 x 50 R with .284 | 160gr | Barnes MRX BT bullet and 43 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are SNPE Vectan SP 10, Hodgdon H335 and Hodgdon H322.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 86% | 45,774 psi | 86% | 2051 fps | 100% |
| Accurate 2015ᴾ | <<locked>> | 100% | 43,801 psi | 83% | 2103 fps | 99.7% |
| Accurate 2460 | <<locked>> | 98% | 45,600 psi | 86% | 2149 fps | 98% |
| Accurate 2495ᴾ | <<locked>> | 100% | 31,386 psi | 59% | 1991 fps | 98.2% |
| Accurate 2520ᴾ | <<locked>> | 100% | 41,974 psi | 79% | 2136 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 92% | 46,557 psi | 88% | 2054 fps | 99.1% |
| Accurate LT-32 | <<locked>> | 92% | 47,094 psi | 89% | 2060 fps | 97.7% |
| ADI AR 2207 | <<locked>> | 90% | 45,121 psi | 85% | 2090 fps | 100% |
| ADI AR 2219 | <<locked>> | 94% | 46,572 psi | 88% | 2172 fps | 99.1% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 40,785 psi | 77% | 2129 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 98% | 47,645 psi | 90% | 2162 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 90% | 46,934 psi | 89% | 2096 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 94% | 47,065 psi | 89% | 2087 fps | 99.3% |
| Hodgdon Benchmarkᴾ | <<locked>> | 100% | 47,543 psi | 90% | 2119 fps | 96.7% |
| Hodgdon H322 | <<locked>> | 98% | 47,819 psi | 90% | 2185 fps | 99.2% |
| Hodgdon H335 | <<locked>> | 96% | 45,411 psi | 86% | 2162 fps | 98.2% |
| Hodgdon H4198 | <<locked>> | 88% | 45,861 psi | 87% | 2057 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,908 psi | 58% | 1250 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 38,856 psi | 73% | 2113 fps | 98.6% |
| IMR 4198 | <<locked>> | 96% | 47,659 psi | 90% | 2113 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 46,267 psi | 87% | 2031 fps | 100% |
| Lovex D073.4 | <<locked>> | 92% | 46,688 psi | 88% | 2162 fps | 97.6% |
| Lovex D073.5 | <<locked>> | 98% | 45,513 psi | 86% | 2146 fps | 96.7% |
| Lovex S053 | <<locked>> | 86% | 47,239 psi | 89% | 2021 fps | 100% |
| Norma 200 | <<locked>> | 94% | 47,790 psi | 90% | 2149 fps | 100% |
| Norma 202ᴾ | <<locked>> | 100% | 39,291 psi | 74% | 2077 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,835 psi | 58% | 1283 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 45,049 psi | 85% | 2054 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 98% | 46,920 psi | 89% | 2159 fps | 97.5% |
| Rottweil R 901ᴾ | <<locked>> | 100% | 43,250 psi | 82% | 2106 fps | 97.6% |
| Shooters World AR Plus | <<locked>> | 92% | 46,688 psi | 88% | 2162 fps | 97.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 46,528 psi | 88% | 1890 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 94% | 46,673 psi | 88% | 2172 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 96% | 46,195 psi | 87% | 2133 fps | 99.5% |
| SNPE Vectan Tubal 3000ᴾ | <<locked>> | 100% | 43,743 psi | 83% | 2054 fps | 97.7% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 34,911 psi | 66% | 1932 fps | 96.5% |
| Somchem S321ᴾ | <<locked>> | 100% | 47,282 psi | 89% | 2188 fps | 96.4% |
| Somchem S335ᴾ | <<locked>> | 100% | 41,176 psi | 78% | 2047 fps | 98.1% |
| Vihtavuori N120 | <<locked>> | 90% | 45,310 psi | 86% | 2054 fps | 100% |
| Vihtavuori N130 | <<locked>> | 98% | 46,195 psi | 87% | 2093 fps | 100% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 42,728 psi | 81% | 2057 fps | 99.5% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,838 psi | 66% | 2018 fps | 98.6% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 37,420 psi | 71% | 2024 fps | 96.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 80% | 37,652 psi | 71% | 1939 fps | 99.4% |
| Accurate 2015 | <<locked>> | 82% | 24,961 psi | 47% | 1775 fps | 95.1% |
| Accurate 2460 | <<locked>> | 90% | 34,287 psi | 65% | 1978 fps | 95.3% |
| Accurate 2495 | <<locked>> | 92% | 23,786 psi | 45% | 1834 fps | 95.4% |
| Accurate 2520 | <<locked>> | 96% | 36,535 psi | 69% | 2054 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 32,242 psi | 61% | 1834 fps | 96.1% |
| Accurate LT-32 | <<locked>> | 84% | 36,811 psi | 70% | 1906 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 33,272 psi | 63% | 1919 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 31,314 psi | 59% | 1923 fps | 95.5% |
| Alliant AR-Comp | <<locked>> | 80% | 21,814 psi | 41% | 1739 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 27,180 psi | 51% | 1831 fps | 97.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 34,606 psi | 65% | 1916 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 30,168 psi | 57% | 1824 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 96% | 41,887 psi | 79% | 2041 fps | 95.3% |
| Hodgdon H322 | 20.3 gr | 84% | 30,472 psi | 58% | 1903 fps | 95.1% |
| Hodgdon H335 | 22.7 gr | 88% | 34,664 psi | 65% | 1991 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 35,708 psi | 67% | 1903 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,727 psi | 43% | 1115 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 28,311 psi | 53% | 1906 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 29,907 psi | 56% | 1834 fps | 98.8% |
| IMR 4227 | <<locked>> | 80% | 40,886 psi | 77% | 1962 fps | 100% |
| Lovex D073.4 | <<locked>> | 86% | 37,956 psi | 72% | 2034 fps | 95.6% |
| Lovex D073.5 | <<locked>> | 94% | 39,682 psi | 75% | 2064 fps | 95.3% |
| Lovex S053 | <<locked>> | 80% | 39,653 psi | 75% | 1926 fps | 100% |
| Norma 200 | <<locked>> | 80% | 30,690 psi | 58% | 1893 fps | 99% |
| Norma 202 | <<locked>> | 96% | 34,418 psi | 65% | 1998 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,365 psi | 42% | 1142 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 39,987 psi | 76% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 39,044 psi | 74% | 2044 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 92% | 33,750 psi | 64% | 1952 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 86% | 37,956 psi | 72% | 2034 fps | 95.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 37,463 psi | 71% | 1781 fps | 100% |
| SNPE Vectan SP 10 | 21.7 gr | 84% | 33,330 psi | 63% | 1962 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 28,427 psi | 54% | 1834 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 33,765 psi | 64% | 1900 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 30,603 psi | 58% | 1854 fps | 95% |
| Somchem S321 | <<locked>> | 96% | 41,394 psi | 78% | 2106 fps | 95% |
| Somchem S335 | <<locked>> | 90% | 30,560 psi | 58% | 1867 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 33,504 psi | 63% | 1893 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 26,716 psi | 50% | 1775 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 26,266 psi | 50% | 1768 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 90% | 25,614 psi | 48% | 1827 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 96% | 32,909 psi | 62% | 1942 fps | 95.3% |
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 43 powders for 7 x 50 R loaded with the .284 | 160gr | Barnes MRX BT. Somchem S321 delivers the highest muzzle velocity at 2,188 fps; across all powders the maximum-charge window runs from 1,250 fps to 2,188 fps. Accurate 2015 gives the best case fill at 100 %, and 43 of the 43 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (365 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 2015, Accurate 2495, Accurate 2520 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. SNPE Vectan SP 10, Hodgdon H335, Hodgdon H322 rank at the top here: for 7 x 50 R with the .284 | 160gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss 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.