Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 76gr | TWENTY-NINE ERTP bullet and 32 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% | 42,061 psi | 88% | 2769 fps | 98.9% |
| Accurate 2460 | <<locked>> | 92% | 43,279 psi | 90% | 2805 fps | 96.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,102 psi | 82% | 2782 fps | 98.8% |
| Accurate LT-30 | <<locked>> | 86% | 43,163 psi | 90% | 2700 fps | 97.9% |
| ADI AR 2207 | <<locked>> | 84% | 42,424 psi | 89% | 2756 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 40,379 psi | 84% | 2772 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 96% | 41,336 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 90% | 43,149 psi | 90% | 2808 fps | 99.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,263 psi | 86% | 2710 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,263 psi | 86% | 2680 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 90% | 41,843 psi | 87% | 2802 fps | 97.5% |
| Hodgdon H335 | <<locked>> | 90% | 42,583 psi | 89% | 2815 fps | 96.7% |
| Hodgdon H4198 | <<locked>> | 82% | 41,872 psi | 87% | 2690 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,198 psi | 67% | 1785 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 41,829 psi | 87% | 2867 fps | 98.4% |
| IMR 4198 | <<locked>> | 88% | 42,003 psi | 88% | 2743 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 42,772 psi | 89% | 2782 fps | 99.9% |
| Norma 202 | <<locked>> | 98% | 42,902 psi | 90% | 2825 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,662 psi | 66% | 1821 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 42,032 psi | 88% | 2769 fps | 96.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 43,105 psi | 90% | 2520 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 41,133 psi | 86% | 2779 fps | 96.2% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 41,075 psi | 86% | 2756 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 40,915 psi | 85% | 2687 fps | 96% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,682 psi | 83% | 2677 fps | 96.9% |
| Somchem S335 | <<locked>> | 96% | 42,177 psi | 88% | 2736 fps | 97.4% |
| Vihtavuori N120 | <<locked>> | 84% | 42,569 psi | 89% | 2713 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,118 psi | 86% | 2707 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 96% | 43,120 psi | 90% | 2753 fps | 99% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,495 psi | 85% | 2795 fps | 98.9% |
| Vihtavuori N140 | <<locked>> | 98% | 40,495 psi | 85% | 2746 fps | 96.5% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 41,539 psi | 87% | 2782 fps | 96.2% |
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% | 28,877 psi | 60% | 2467 fps | 95.2% |
| Accurate 2460 | <<locked>> | 88% | 37,927 psi | 79% | 2697 fps | 95.1% |
| Accurate 2495 | <<locked>> | 90% | 27,688 psi | 58% | 2513 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 35,824 psi | 75% | 2546 fps | 96% |
| ADI AR 2207 | <<locked>> | 80% | 37,492 psi | 78% | 2664 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 35,389 psi | 74% | 2661 fps | 95.6% |
| Alliant AR-Comp | 21 gr | 80% | 24,947 psi | 52% | 2415 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,401 psi | 66% | 2549 fps | 97.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,914 psi | 81% | 2661 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,142 psi | 71% | 2526 fps | 95.8% |
| Hodgdon H322 | 22.8 gr | 84% | 34,563 psi | 72% | 2641 fps | 95.3% |
| Hodgdon H335 | <<locked>> | 86% | 37,521 psi | 78% | 2710 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 39,479 psi | 82% | 2641 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,424 psi | 49% | 1591 fps | 100% |
| IMR 3031 | 23.6 gr | 90% | 32,561 psi | 68% | 2648 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 33,402 psi | 70% | 2556 fps | 98.7% |
| Norma 200 | <<locked>> | 80% | 35,737 psi | 75% | 2638 fps | 99.1% |
| Norma 202 | <<locked>> | 94% | 37,637 psi | 79% | 2717 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,540 psi | 49% | 1634 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 39,189 psi | 82% | 2710 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,538 psi | 85% | 2480 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 38,363 psi | 80% | 2723 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 31,778 psi | 66% | 2543 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 38,479 psi | 80% | 2638 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 35,230 psi | 74% | 2582 fps | 95.5% |
| Somchem S335 | <<locked>> | 90% | 35,128 psi | 73% | 2589 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 37,608 psi | 79% | 2625 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,139 psi | 63% | 2461 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 84% | 29,892 psi | 62% | 2461 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 90% | 29,530 psi | 62% | 2536 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 94% | 36,042 psi | 75% | 2651 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 98% | 39,189 psi | 82% | 2733 fps | 95.5% |
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 32 powders for 6 x 52 R Bretschneider loaded with the .243 | 76gr | TWENTY-NINE ERTP. IMR 3031 delivers the highest muzzle velocity at 2,867 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,867 fps. Accurate 2495 gives the best case fill at 100 %, and 32 of the 32 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 76.0 gr projectile in 0.243" calls for a 1:8.5 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 | 76gr | TWENTY-NINE ERTP 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.