Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 71gr | Berger BT Target bullet and 30 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, IMR 3031 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 2015 | <<locked>> | 94% | 42,743 psi | 89% | 2890 fps | 98.9% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,755 psi | 83% | 2904 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 84% | 41,002 psi | 86% | 2769 fps | 97.2% |
| ADI AR 2207 | <<locked>> | 84% | 42,975 psi | 90% | 2884 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 41,060 psi | 86% | 2900 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 96% | 41,756 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 90% | 43,192 psi | 90% | 2923 fps | 99.6% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,713 psi | 87% | 2831 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 42,047 psi | 88% | 2802 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 90% | 42,496 psi | 89% | 2930 fps | 97.4% |
| Hodgdon H335 | <<locked>> | 90% | 43,294 psi | 90% | 2940 fps | 96.6% |
| Hodgdon H4198 | <<locked>> | 82% | 42,322 psi | 88% | 2812 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,778 psi | 66% | 1870 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 42,656 psi | 89% | 2995 fps | 98.3% |
| IMR 4198 | <<locked>> | 88% | 42,453 psi | 89% | 2864 fps | 99.8% |
| Norma 200 | <<locked>> | 84% | 41,002 psi | 86% | 2861 fps | 99.6% |
| Norma 202 | <<locked>> | 96% | 40,741 psi | 85% | 2890 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,691 psi | 66% | 1913 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 42,163 psi | 88% | 2884 fps | 96% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 41,568 psi | 87% | 2897 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 41,698 psi | 87% | 2884 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 41,611 psi | 87% | 2808 fps | 96% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,914 psi | 83% | 2789 fps | 96.7% |
| Somchem S335 | <<locked>> | 96% | 42,525 psi | 89% | 2851 fps | 97.3% |
| Vihtavuori N120 | <<locked>> | 84% | 43,062 psi | 90% | 2838 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,611 psi | 87% | 2828 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 96% | 43,207 psi | 90% | 2864 fps | 98.8% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,785 psi | 85% | 2910 fps | 98.8% |
| Vihtavuori N140 | <<locked>> | 98% | 41,075 psi | 86% | 2867 fps | 96.4% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 42,279 psi | 88% | 2904 fps | 96.1% |
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>> | 82% | 29,269 psi | 61% | 2575 fps | 95% |
| Accurate 2495 | <<locked>> | 90% | 28,297 psi | 59% | 2625 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 36,289 psi | 76% | 2664 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 37,782 psi | 79% | 2782 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 35,882 psi | 75% | 2779 fps | 95.4% |
| Alliant AR-Comp | 22.4 gr | 80% | 25,338 psi | 53% | 2526 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,604 psi | 66% | 2661 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 39,421 psi | 82% | 2782 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,447 psi | 72% | 2638 fps | 95.6% |
| Hodgdon H322 | 24.3 gr | 84% | 35,085 psi | 73% | 2759 fps | 95.1% |
| Hodgdon H335 | <<locked>> | 88% | 40,509 psi | 85% | 2884 fps | 95.8% |
| Hodgdon H4198 | <<locked>> | 80% | 40,030 psi | 84% | 2762 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,540 psi | 49% | 1677 fps | 100% |
| IMR 3031 | 25.1 gr | 90% | 32,851 psi | 69% | 2762 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 33,431 psi | 70% | 2661 fps | 98.5% |
| Norma 200 | <<locked>> | 80% | 35,781 psi | 75% | 2746 fps | 98.9% |
| Norma 202 | <<locked>> | 94% | 38,029 psi | 79% | 2831 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,206 psi | 48% | 1709 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 39,987 psi | 84% | 2838 fps | 95.4% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 38,508 psi | 80% | 2831 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 32,358 psi | 68% | 2664 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 38,798 psi | 81% | 2749 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 35,302 psi | 74% | 2687 fps | 95.2% |
| Somchem S335 | <<locked>> | 90% | 35,752 psi | 75% | 2707 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 37,956 psi | 79% | 2743 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,705 psi | 64% | 2575 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 84% | 30,168 psi | 63% | 2566 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 90% | 29,921 psi | 63% | 2648 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 96% | 38,406 psi | 80% | 2812 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 98% | 39,566 psi | 83% | 2848 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 30 powders for 6 x 52 R Bretschneider loaded with the .243 | 71gr | Berger BT Target. IMR 3031 delivers the highest muzzle velocity at 2,995 fps; across all powders the maximum-charge window runs from 1,870 fps to 2,995 fps. Accurate 2495 gives the best case fill at 100 %, and 30 of the 30 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 71.0 gr projectile in 0.243" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, 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. Alliant AR-Comp, IMR 3031, Hodgdon H322 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 71gr | Berger BT Target 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.