Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 85gr | Barnes Solid BT bullet and 40 powders. The key underlying parameters are shown in the table above.
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>> | 90% | 41,104 psi | 86% | 2612 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 41,989 psi | 88% | 2648 fps | 97.6% |
| Accurate 2495 | <<locked>> | 98% | 41,481 psi | 87% | 2687 fps | 99.7% |
| Accurate 2520 | <<locked>> | 92% | 42,308 psi | 88% | 2694 fps | 97.3% |
| Accurate 4064ᴾ | <<locked>> | 100% | 41,060 psi | 86% | 2697 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 41,394 psi | 86% | 2536 fps | 98.6% |
| Accurate LT-32 | <<locked>> | 82% | 41,756 psi | 87% | 2543 fps | 97% |
| ADI AR 2219 | <<locked>> | 84% | 41,626 psi | 87% | 2664 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 94% | 42,917 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 41,887 psi | 88% | 2641 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 42,293 psi | 88% | 2569 fps | 99% |
| Hodgdon Benchmark | <<locked>> | 90% | 43,308 psi | 90% | 2621 fps | 96.2% |
| Hodgdon BL-C2 | <<locked>> | 94% | 42,859 psi | 90% | 2720 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 88% | 43,149 psi | 90% | 2694 fps | 98.8% |
| Hodgdon H335 | <<locked>> | 86% | 41,133 psi | 86% | 2654 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,866 psi | 69% | 1696 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 40,959 psi | 86% | 2713 fps | 99.1% |
| IMR 4198 | <<locked>> | 84% | 40,828 psi | 85% | 2579 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 42,279 psi | 88% | 2657 fps | 97% |
| Lovex D073.5 | <<locked>> | 88% | 42,134 psi | 88% | 2648 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 96% | 42,946 psi | 90% | 2717 fps | 97.4% |
| Norma 200 | <<locked>> | 82% | 41,626 psi | 87% | 2615 fps | 100% |
| Norma 202 | <<locked>> | 94% | 41,510 psi | 87% | 2664 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,416 psi | 68% | 1729 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 42,946 psi | 90% | 2664 fps | 97% |
| Rottweil R 901 | <<locked>> | 90% | 40,524 psi | 85% | 2608 fps | 97.2% |
| Shooters World AR Plus | <<locked>> | 82% | 42,279 psi | 88% | 2657 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 96% | 42,946 psi | 90% | 2717 fps | 97.4% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 42,061 psi | 88% | 2664 fps | 97.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 42,337 psi | 88% | 2641 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 42,482 psi | 89% | 2589 fps | 97.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 40,799 psi | 85% | 2572 fps | 98.4% |
| Somchem S321 | <<locked>> | 90% | 43,192 psi | 90% | 2687 fps | 95.9% |
| Somchem S335 | <<locked>> | 92% | 41,162 psi | 86% | 2585 fps | 98.3% |
| Vihtavuori N130 | <<locked>> | 88% | 42,221 psi | 88% | 2589 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 92% | 41,916 psi | 88% | 2595 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 98% | 42,380 psi | 89% | 2687 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 96% | 41,974 psi | 88% | 2648 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 98% | 43,163 psi | 90% | 2684 fps | 97.9% |
| Winchester 748 | <<locked>> | 92% | 41,437 psi | 87% | 2690 fps | 96% |
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 29,994 psi | 63% | 2372 fps | 97.1% |
| Accurate 2460 | <<locked>> | 82% | 34,287 psi | 72% | 2487 fps | 95.4% |
| Accurate 2495 | <<locked>> | 82% | 24,105 psi | 50% | 2280 fps | 95% |
| Accurate 2520 | <<locked>> | 88% | 36,564 psi | 76% | 2579 fps | 95.7% |
| Accurate 4064 | <<locked>> | 92% | 31,763 psi | 66% | 2500 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 38,580 psi | 81% | 2480 fps | 98.1% |
| Accurate LT-32 | <<locked>> | 80% | 38,928 psi | 81% | 2487 fps | 96.2% |
| ADI AR 2219 | <<locked>> | 80% | 36,492 psi | 76% | 2559 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 27,369 psi | 57% | 2379 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 34,461 psi | 72% | 2490 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 37,043 psi | 77% | 2467 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 88% | 40,886 psi | 85% | 2575 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 92% | 39,900 psi | 83% | 2664 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 33,141 psi | 69% | 2480 fps | 96.3% |
| Hodgdon H335 | <<locked>> | 80% | 33,359 psi | 70% | 2487 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,946 psi | 50% | 1509 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 27,862 psi | 58% | 2395 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 36,187 psi | 76% | 2487 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 80% | 39,291 psi | 82% | 2598 fps | 96.2% |
| Lovex D073.5 | <<locked>> | 86% | 39,247 psi | 82% | 2592 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 90% | 34,867 psi | 73% | 2552 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 39,233 psi | 82% | 2572 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 34,345 psi | 72% | 2513 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,149 psi | 50% | 1552 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 37,797 psi | 79% | 2559 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 84% | 34,142 psi | 71% | 2467 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 39,291 psi | 82% | 2598 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 34,867 psi | 73% | 2552 fps | 95.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,637 psi | 77% | 2552 fps | 96.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 35,215 psi | 74% | 2500 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 32,967 psi | 69% | 2392 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 29,994 psi | 63% | 2336 fps | 95.1% |
| Somchem S321 | <<locked>> | 88% | 40,263 psi | 84% | 2631 fps | 95% |
| Somchem S335 | <<locked>> | 82% | 30,153 psi | 63% | 2346 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 33,330 psi | 70% | 2411 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 80% | 28,921 psi | 60% | 2316 fps | 96.5% |
| Vihtavuori N135 | <<locked>> | 82% | 25,628 psi | 54% | 2303 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 88% | 32,808 psi | 69% | 2454 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 90% | 33,489 psi | 70% | 2484 fps | 95.1% |
| Winchester 748 | <<locked>> | 90% | 38,624 psi | 81% | 2631 fps | 95.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 77 powders for 6 x 52 R Bretschneider loaded with the .243 | 85gr | Barnes Solid BT. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,746 fps. Accurate 4064 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Alliant Reloder- TS 15.5, Bofors RP3 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. As outliers, Accurate 2200, Accurate 2230, ADI AR 2206H burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.