Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 85gr | Barnes X BT bullet and 41 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Vihtavuori N135 and Shooters World Precision.
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>> | 82% | 42,482 psi | 89% | 2687 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 42,830 psi | 89% | 2746 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 41,408 psi | 87% | 2730 fps | 98.3% |
| Accurate 4064 | <<locked>> | 90% | 42,801 psi | 89% | 2772 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 40,814 psi | 85% | 2687 fps | 96.5% |
| Alliant AR-Comp | <<locked>> | 84% | 42,119 psi | 88% | 2762 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 40,901 psi | 85% | 2736 fps | 96.2% |
| Bofors RP3 | <<locked>> | 90% | 40,814 psi | 85% | 2746 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 43,062 psi | 90% | 2690 fps | 97.6% |
| Hodgdon BL-C2 | <<locked>> | 84% | 41,771 psi | 87% | 2759 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 84% | 41,785 psi | 87% | 2740 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 42,424 psi | 89% | 2802 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,534 psi | 72% | 1798 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 42,409 psi | 89% | 2736 fps | 96.1% |
| IMR 3031 | <<locked>> | 86% | 42,815 psi | 89% | 2805 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 42,902 psi | 90% | 2789 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 40,814 psi | 85% | 2687 fps | 96.5% |
| Lovex D073.6 | <<locked>> | 86% | 42,540 psi | 89% | 2762 fps | 98.6% |
| Lovex S062 | <<locked>> | 88% | 41,568 psi | 87% | 2717 fps | 96.8% |
| Norma 201 | <<locked>> | 84% | 41,205 psi | 86% | 2690 fps | 96.7% |
| Norma 202 | <<locked>> | 86% | 43,265 psi | 90% | 2756 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,795 psi | 73% | 1841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 41,118 psi | 86% | 2825 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 82% | 42,975 psi | 90% | 2707 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 86% | 41,394 psi | 86% | 2687 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 92% | 41,002 psi | 86% | 2740 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 86% | 42,540 psi | 89% | 2762 fps | 98.6% |
| Shooters World Precision | <<locked>> | 88% | 41,568 psi | 87% | 2717 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 42,670 psi | 89% | 2661 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 41,568 psi | 87% | 2651 fps | 99.5% |
| Somchem S335 | <<locked>> | 84% | 42,206 psi | 88% | 2664 fps | 99.4% |
| Somchem S355 | <<locked>> | 92% | 41,771 psi | 87% | 2740 fps | 95.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,580 psi | 81% | 2753 fps | 96.2% |
| Vihtavuori N133 | <<locked>> | 84% | 42,366 psi | 89% | 2664 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 42,134 psi | 88% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 40,770 psi | 85% | 2684 fps | 99% |
| Vihtavuori N150 | <<locked>> | 94% | 42,482 psi | 89% | 2730 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 82% | 40,799 psi | 85% | 2684 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 88% | 41,959 psi | 88% | 2723 fps | 98.8% |
| Winchester 748 | <<locked>> | 84% | 41,887 psi | 88% | 2772 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 41,263 psi | 86% | 2736 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>> | 80% | 40,205 psi | 84% | 2641 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 33,866 psi | 71% | 2559 fps | 99.4% |
| Accurate 2520 | <<locked>> | 80% | 38,725 psi | 81% | 2674 fps | 97.8% |
| Accurate 4064 | <<locked>> | 80% | 31,908 psi | 67% | 2526 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,667 psi | 81% | 2641 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 80% | 36,999 psi | 77% | 2661 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 38,609 psi | 81% | 2690 fps | 95.5% |
| Bofors RP3 | <<locked>> | 88% | 38,493 psi | 80% | 2694 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,799 psi | 85% | 2644 fps | 97.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,709 psi | 77% | 2651 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 39,204 psi | 82% | 2684 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 37,405 psi | 78% | 2690 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,802 psi | 54% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 40,132 psi | 84% | 2687 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 35,578 psi | 74% | 2651 fps | 99.1% |
| IMR 4895 | <<locked>> | 86% | 40,205 psi | 84% | 2733 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 38,667 psi | 81% | 2641 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 80% | 35,288 psi | 74% | 2605 fps | 96.8% |
| Lovex S062 | <<locked>> | 84% | 36,912 psi | 77% | 2612 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 36,593 psi | 76% | 2589 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 35,940 psi | 75% | 2598 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,136 psi | 55% | 1650 fps | 100% |
| ReloadSwiss RS 60 | 29.5 gr | 86% | 34,127 psi | 71% | 2641 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 40,364 psi | 84% | 2654 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 36,840 psi | 77% | 2585 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 90% | 38,392 psi | 80% | 2684 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,288 psi | 74% | 2605 fps | 96.8% |
| Shooters World Precision | 26.7 gr | 84% | 36,912 psi | 77% | 2612 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,753 psi | 79% | 2559 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,024 psi | 65% | 2418 fps | 97.2% |
| Somchem S335 | <<locked>> | 80% | 37,521 psi | 78% | 2569 fps | 98.7% |
| Somchem S355 | <<locked>> | 90% | 39,566 psi | 83% | 2694 fps | 95.3% |
| Somchem S365 | <<locked>> | 98% | 36,564 psi | 76% | 2703 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 37,507 psi | 78% | 2566 fps | 99.6% |
| Vihtavuori N135 | 24.7 gr | 80% | 33,083 psi | 69% | 2539 fps | 99.2% |
| Vihtavuori N140 | <<locked>> | 80% | 34,127 psi | 71% | 2536 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 88% | 35,505 psi | 74% | 2582 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 38,218 psi | 80% | 2625 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 32,822 psi | 69% | 2516 fps | 96.5% |
| Winchester 748 | <<locked>> | 80% | 37,130 psi | 78% | 2667 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 84% | 39,073 psi | 82% | 2690 fps | 95.2% |
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 41 powders for 6 x 52 R BB2 loaded with the .243 | 85gr | Barnes X BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,798 fps to 2,825 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Somchem S365 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, Vihtavuori N135, Shooters World Precision rank at the top here: for 6 x 52 R BB2 with the .243 | 85gr | Barnes X BT 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.