Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 65gr | Berger Varmint bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Alliant Reloder-10x and SNPE Vectan SP 3.
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 2015 | <<locked>> | 96% | 43,018 psi | 90% | 3015 fps | 98.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 37,130 psi | 78% | 2963 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 86% | 41,466 psi | 87% | 2887 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 86% | 43,265 psi | 90% | 3015 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 41,466 psi | 87% | 3022 fps | 96.2% |
| Alliant AR-Comp | <<locked>> | 98% | 42,438 psi | 89% | 3100 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 90% | 41,292 psi | 86% | 3009 fps | 98.8% |
| Alliant Reloder-7 | <<locked>> | 84% | 42,467 psi | 89% | 2966 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 42,395 psi | 89% | 2920 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 92% | 42,931 psi | 90% | 3051 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,502 psi | 66% | 1955 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 42,786 psi | 89% | 3114 fps | 97.5% |
| IMR 4198 | <<locked>> | 90% | 42,917 psi | 90% | 2995 fps | 99.6% |
| Norma 200 | <<locked>> | 86% | 40,988 psi | 86% | 2982 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,343 psi | 65% | 2001 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 41,568 psi | 87% | 2733 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 41,785 psi | 87% | 3002 fps | 97.3% |
| Somchem S335 | <<locked>> | 98% | 43,294 psi | 90% | 2979 fps | 96.6% |
| Vihtavuori N120 | <<locked>> | 84% | 41,002 psi | 86% | 2927 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 42,148 psi | 88% | 2956 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 96% | 41,278 psi | 86% | 2943 fps | 97.8% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 38,624 psi | 81% | 2979 fps | 97.6% |
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 2015 | <<locked>> | 88% | 33,185 psi | 69% | 2792 fps | 95.6% |
| Accurate 2495 | <<locked>> | 96% | 32,111 psi | 67% | 2838 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 82% | 36,767 psi | 77% | 2782 fps | 95% |
| ADI AR 2207 | <<locked>> | 80% | 35,940 psi | 75% | 2864 fps | 99.9% |
| ADI AR 2219 | <<locked>> | 86% | 38,827 psi | 81% | 2959 fps | 95.4% |
| Alliant AR-Comp | 23.9 gr | 84% | 27,137 psi | 57% | 2687 fps | 95.5% |
| Alliant Reloder-10x | 22.2 gr | 80% | 29,950 psi | 63% | 2723 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 80% | 37,637 psi | 79% | 2861 fps | 98.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 37,521 psi | 78% | 2815 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 90% | 40,103 psi | 84% | 2989 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,047 psi | 48% | 1749 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 35,404 psi | 74% | 2936 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 32,097 psi | 67% | 2740 fps | 97.3% |
| Norma 200 | <<locked>> | 80% | 33,910 psi | 71% | 2815 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,061 psi | 48% | 1795 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 39,305 psi | 82% | 2694 fps | 100% |
| SNPE Vectan SP 3 | 23.4 gr | 84% | 34,896 psi | 73% | 2838 fps | 95.1% |
| Somchem S335 | <<locked>> | 94% | 38,029 psi | 79% | 2867 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 36,129 psi | 75% | 2828 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 30,893 psi | 65% | 2687 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 88% | 32,387 psi | 68% | 2733 fps | 95% |
| Vihtavuori N135 | <<locked>> | 94% | 31,836 psi | 67% | 2805 fps | 95.2% |
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 22 powders for 6 x 52 R Bretschneider loaded with the .243 | 65gr | Berger Varmint. IMR 3031 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,114 fps. Accurate 2495 gives the best case fill at 100 %, and 22 of the 22 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 65.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, 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 AR-Comp, Alliant Reloder-10x, SNPE Vectan SP 3 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 65gr | Berger Varmint 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.