Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 71gr | Berger BT M 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% | 42,119 psi | 88% | 2874 fps | 98.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,189 psi | 82% | 2887 fps | 98.5% |
| Accurate LT-30 | <<locked>> | 86% | 43,250 psi | 90% | 2808 fps | 97.6% |
| ADI AR 2207 | <<locked>> | 84% | 42,235 psi | 88% | 2867 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 40,524 psi | 85% | 2881 fps | 96.8% |
| Alliant AR-Comp | <<locked>> | 96% | 41,205 psi | 86% | 2949 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 90% | 43,004 psi | 90% | 2913 fps | 99.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,495 psi | 87% | 2822 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,597 psi | 87% | 2789 fps | 97.6% |
| Hodgdon H322 | <<locked>> | 90% | 41,916 psi | 88% | 2910 fps | 97.2% |
| Hodgdon H335 | <<locked>> | 90% | 42,786 psi | 89% | 2923 fps | 96.3% |
| Hodgdon H4198 | <<locked>> | 82% | 42,177 psi | 88% | 2802 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,749 psi | 66% | 1864 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 42,090 psi | 88% | 2979 fps | 98.1% |
| IMR 4198 | <<locked>> | 88% | 42,279 psi | 88% | 2858 fps | 99.8% |
| Norma 200 | <<locked>> | 86% | 42,670 psi | 89% | 2890 fps | 99.8% |
| Norma 202 | <<locked>> | 98% | 43,076 psi | 90% | 2933 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,633 psi | 66% | 1906 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 41,640 psi | 87% | 2867 fps | 95.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,714 psi | 89% | 2625 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 41,060 psi | 86% | 2864 fps | 97.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 41,031 psi | 86% | 2792 fps | 95.7% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,479 psi | 82% | 2776 fps | 96.5% |
| Somchem S335 | <<locked>> | 96% | 42,032 psi | 88% | 2838 fps | 97.1% |
| Vihtavuori N120 | <<locked>> | 84% | 42,380 psi | 89% | 2822 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 40,988 psi | 86% | 2812 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 96% | 42,641 psi | 89% | 2848 fps | 98.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,248 psi | 84% | 2894 fps | 98.6% |
| Vihtavuori N140 | <<locked>> | 98% | 40,567 psi | 85% | 2851 fps | 96.1% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 41,858 psi | 87% | 2890 fps | 95.9% |
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>> | 84% | 30,792 psi | 64% | 2615 fps | 95.5% |
| Accurate 2495 | <<locked>> | 92% | 29,559 psi | 62% | 2657 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 35,723 psi | 75% | 2644 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 37,536 psi | 78% | 2772 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 35,360 psi | 74% | 2762 fps | 95.1% |
| Alliant AR-Comp | 22.1 gr | 80% | 24,889 psi | 52% | 2503 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,401 psi | 66% | 2651 fps | 97% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,812 psi | 81% | 2766 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,011 psi | 71% | 2621 fps | 95.4% |
| Hodgdon H322 | 24.6 gr | 86% | 36,956 psi | 77% | 2802 fps | 95.7% |
| Hodgdon H335 | <<locked>> | 88% | 40,030 psi | 84% | 2867 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 39,407 psi | 82% | 2743 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,424 psi | 49% | 1670 fps | 100% |
| IMR 3031 | 24.9 gr | 90% | 32,735 psi | 68% | 2753 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 33,257 psi | 69% | 2654 fps | 98.3% |
| Norma 200 | <<locked>> | 80% | 35,592 psi | 74% | 2740 fps | 98.8% |
| Norma 202 | <<locked>> | 96% | 40,147 psi | 84% | 2874 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,482 psi | 49% | 1713 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 39,436 psi | 82% | 2818 fps | 95.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,756 psi | 85% | 2592 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 34,084 psi | 71% | 2703 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 38,696 psi | 81% | 2743 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 37,318 psi | 78% | 2726 fps | 95.8% |
| Somchem S335 | <<locked>> | 90% | 35,288 psi | 74% | 2690 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 37,710 psi | 79% | 2733 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,153 psi | 63% | 2556 fps | 96.2% |
| Vihtavuori N133 | <<locked>> | 86% | 31,444 psi | 66% | 2598 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 90% | 29,443 psi | 62% | 2628 fps | 95.1% |
| Vihtavuori N140 | <<locked>> | 96% | 37,956 psi | 79% | 2795 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 98% | 39,175 psi | 82% | 2835 fps | 95.1% |
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 M. IMR 3031 delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,864 fps to 2,979 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 1:10.0 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 M 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.