Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 85gr | Lehigh Defense Controlled Chaos bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Hodgdon BL-C2 and IMR 3031.
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>> | 86% | 42,946 psi | 90% | 2710 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 40,973 psi | 86% | 2697 fps | 98.4% |
| Accurate 2495 | <<locked>> | 92% | 41,539 psi | 87% | 2743 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 41,292 psi | 86% | 2740 fps | 98.2% |
| Accurate 4064 | <<locked>> | 94% | 41,408 psi | 87% | 2766 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 41,452 psi | 87% | 2710 fps | 96.5% |
| Alliant AR-Comp | <<locked>> | 88% | 42,569 psi | 89% | 2782 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 41,930 psi | 88% | 2799 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 41,234 psi | 86% | 2753 fps | 96.1% |
| Alliant Reloder-10x | <<locked>> | 82% | 42,975 psi | 90% | 2723 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 40,698 psi | 85% | 2756 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 41,510 psi | 87% | 2667 fps | 97.1% |
| Hodgdon BL-C2 | <<locked>> | 88% | 42,163 psi | 88% | 2776 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 82% | 41,481 psi | 87% | 2730 fps | 99.3% |
| Hodgdon H335 | <<locked>> | 82% | 42,554 psi | 89% | 2753 fps | 98.9% |
| Hodgdon H4895 | <<locked>> | 88% | 42,293 psi | 88% | 2759 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 42,859 psi | 90% | 2815 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,750 psi | 71% | 1781 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 42,873 psi | 90% | 2815 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 41,452 psi | 87% | 2710 fps | 96.5% |
| Lovex D073.5 | <<locked>> | 82% | 40,828 psi | 85% | 2694 fps | 97.3% |
| Lovex D073.6 | <<locked>> | 90% | 42,641 psi | 89% | 2779 fps | 98.5% |
| Lovex S062 | <<locked>> | 92% | 41,307 psi | 86% | 2720 fps | 96.6% |
| Norma 201 | <<locked>> | 88% | 41,133 psi | 86% | 2703 fps | 96.5% |
| Norma 202 | <<locked>> | 88% | 40,843 psi | 85% | 2720 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,837 psi | 71% | 1824 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 41,365 psi | 86% | 2707 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 41,756 psi | 87% | 2841 fps | 97.8% |
| Rottweil R 901 | <<locked>> | 86% | 42,395 psi | 89% | 2713 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 90% | 41,379 psi | 86% | 2700 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 98% | 43,250 psi | 90% | 2795 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 42,641 psi | 89% | 2779 fps | 98.5% |
| Shooters World Precision | <<locked>> | 92% | 41,307 psi | 86% | 2720 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 40,843 psi | 85% | 2635 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 42,583 psi | 89% | 2677 fps | 99.5% |
| Somchem S321 | <<locked>> | 84% | 41,727 psi | 87% | 2736 fps | 96.9% |
| Somchem S335 | <<locked>> | 88% | 42,525 psi | 89% | 2684 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 82% | 40,959 psi | 86% | 2631 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 43,250 psi | 90% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 42,424 psi | 89% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 41,249 psi | 86% | 2703 fps | 99% |
| Vihtavuori N150 | <<locked>> | 98% | 42,859 psi | 90% | 2743 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 86% | 41,466 psi | 87% | 2703 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 92% | 42,525 psi | 89% | 2743 fps | 98.8% |
| Winchester 748 | <<locked>> | 88% | 43,033 psi | 90% | 2802 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 42,409 psi | 89% | 2769 fps | 96% |
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>> | 80% | 35,244 psi | 74% | 2556 fps | 99.3% |
| Accurate 2460 | <<locked>> | 80% | 38,159 psi | 80% | 2638 fps | 97.8% |
| Accurate 2495 | <<locked>> | 80% | 27,891 psi | 58% | 2434 fps | 97.8% |
| Accurate 2520 | <<locked>> | 80% | 33,518 psi | 70% | 2572 fps | 96% |
| Accurate 4064 | <<locked>> | 82% | 28,137 psi | 59% | 2451 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 36,753 psi | 77% | 2605 fps | 95% |
| Alliant AR-Comp | <<locked>> | 80% | 32,474 psi | 68% | 2579 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 38,943 psi | 81% | 2736 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 38,783 psi | 81% | 2703 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,350 psi | 84% | 2674 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 38,203 psi | 80% | 2700 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,883 psi | 77% | 2566 fps | 95.7% |
| Hodgdon BL-C2 | 28.3 gr | 84% | 36,535 psi | 76% | 2657 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 38,885 psi | 81% | 2677 fps | 98.9% |
| Hodgdon H335 | <<locked>> | 80% | 39,624 psi | 83% | 2694 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 86% | 39,407 psi | 82% | 2697 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 40,408 psi | 84% | 2766 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,729 psi | 52% | 1588 fps | 100% |
| IMR 3031 | 24.5 gr | 80% | 31,125 psi | 65% | 2552 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 82% | 36,753 psi | 77% | 2605 fps | 95% |
| Lovex D073.5 | <<locked>> | 80% | 38,000 psi | 79% | 2635 fps | 96.5% |
| Lovex D073.6 | <<locked>> | 82% | 32,460 psi | 68% | 2556 fps | 95.6% |
| Lovex S062 | <<locked>> | 88% | 36,579 psi | 76% | 2618 fps | 95.1% |
| Norma 201 | <<locked>> | 86% | 38,305 psi | 80% | 2644 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 31,531 psi | 66% | 2507 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,932 psi | 52% | 1627 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,537 psi | 81% | 2648 fps | 97.1% |
| ReloadSwiss RS 60 | 30.6 gr | 92% | 36,709 psi | 77% | 2717 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 35,418 psi | 74% | 2562 fps | 97% |
| Rottweil R 902 | <<locked>> | 86% | 36,651 psi | 77% | 2598 fps | 95% |
| Rottweil R 903 | <<locked>> | 96% | 40,596 psi | 85% | 2743 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,460 psi | 68% | 2556 fps | 95.6% |
| Shooters World Precision | <<locked>> | 88% | 36,579 psi | 76% | 2618 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,881 psi | 71% | 2484 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,427 psi | 57% | 2336 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 36,622 psi | 77% | 2625 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 33,156 psi | 69% | 2484 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 80% | 38,493 psi | 80% | 2585 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 33,721 psi | 70% | 2497 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 28,718 psi | 60% | 2451 fps | 98% |
| Vihtavuori N140 | <<locked>> | 80% | 29,979 psi | 63% | 2448 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 92% | 35,157 psi | 73% | 2585 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 82% | 36,651 psi | 77% | 2602 fps | 95% |
| Vihtavuori N540 | <<locked>> | 82% | 30,516 psi | 64% | 2474 fps | 95.4% |
| Winchester 748 | <<locked>> | 82% | 35,143 psi | 73% | 2628 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 39,508 psi | 83% | 2710 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 46 powders for 6 x 52 R BB2 loaded with the .243 | 85gr | Lehigh Defense Controlled Chaos. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,841 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. 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. ReloadSwiss RS 60, Hodgdon BL-C2, IMR 3031 rank at the top here: for 6 x 52 R BB2 with the .243 | 85gr | Lehigh Defense Controlled Chaos 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.