Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 88gr | Warner Tool Co. Flat Line bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, IMR 3031 and Hodgdon BL-C2.
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% | 42,699 psi | 89% | 2651 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 40,872 psi | 85% | 2644 fps | 98.5% |
| Accurate 2495 | <<locked>> | 92% | 41,640 psi | 87% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 42,366 psi | 89% | 2720 fps | 98.5% |
| Accurate 4064 | <<locked>> | 94% | 41,539 psi | 87% | 2713 fps | 99.2% |
| ADI Benchmark 8208 | <<locked>> | 86% | 41,408 psi | 87% | 2654 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 88% | 42,424 psi | 89% | 2726 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 41,698 psi | 87% | 2740 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 40,944 psi | 86% | 2697 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 82% | 42,989 psi | 90% | 2667 fps | 100% |
| Bofors RP3 | <<locked>> | 96% | 43,236 psi | 90% | 2753 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 41,321 psi | 86% | 2612 fps | 97.2% |
| Hodgdon BL-C2 | <<locked>> | 88% | 41,887 psi | 88% | 2720 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 84% | 41,205 psi | 86% | 2671 fps | 99.4% |
| Hodgdon H4895 | <<locked>> | 88% | 41,829 psi | 87% | 2697 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 42,728 psi | 89% | 2762 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,837 psi | 71% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 42,192 psi | 88% | 2684 fps | 96% |
| IMR 3031 | <<locked>> | 92% | 41,423 psi | 87% | 2736 fps | 99.8% |
| IMR 4895 | <<locked>> | 92% | 43,120 psi | 90% | 2749 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 86% | 41,408 psi | 87% | 2654 fps | 96.6% |
| Lovex D073.5 | <<locked>> | 82% | 40,335 psi | 84% | 2635 fps | 97.4% |
| Lovex D073.6 | <<locked>> | 90% | 42,366 psi | 89% | 2720 fps | 98.5% |
| Lovex S062 | <<locked>> | 92% | 41,350 psi | 86% | 2671 fps | 96.8% |
| Norma 201 | <<locked>> | 88% | 40,625 psi | 85% | 2641 fps | 96.5% |
| Norma 202 | <<locked>> | 88% | 40,785 psi | 85% | 2664 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,953 psi | 71% | 1781 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 41,220 psi | 86% | 2651 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 41,365 psi | 86% | 2779 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 86% | 42,177 psi | 88% | 2654 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 90% | 41,321 psi | 86% | 2644 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 98% | 43,120 psi | 90% | 2740 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 42,366 psi | 89% | 2720 fps | 98.5% |
| Shooters World Precision | <<locked>> | 92% | 41,350 psi | 86% | 2671 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 43,279 psi | 90% | 2625 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 42,177 psi | 88% | 2618 fps | 99.5% |
| Somchem S321 | <<locked>> | 84% | 41,800 psi | 87% | 2684 fps | 97.1% |
| Somchem S335 | <<locked>> | 88% | 42,018 psi | 88% | 2618 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 41,858 psi | 87% | 2700 fps | 96% |
| Vihtavuori N130 | <<locked>> | 84% | 43,236 psi | 90% | 2618 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 43,033 psi | 90% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 41,843 psi | 87% | 2684 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 41,249 psi | 86% | 2651 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 98% | 42,743 psi | 89% | 2690 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 86% | 41,423 psi | 87% | 2651 fps | 96.7% |
| Vihtavuori N540 | <<locked>> | 92% | 42,337 psi | 88% | 2687 fps | 98.9% |
| Winchester 748 | <<locked>> | 86% | 43,134 psi | 90% | 2749 fps | 98% |
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% | 35,215 psi | 74% | 2503 fps | 99.4% |
| Accurate 2460 | <<locked>> | 80% | 37,985 psi | 79% | 2585 fps | 97.9% |
| Accurate 2495 | <<locked>> | 80% | 27,586 psi | 58% | 2379 fps | 97.9% |
| Accurate 2520 | <<locked>> | 80% | 31,981 psi | 67% | 2497 fps | 95.6% |
| Accurate 4064 | <<locked>> | 82% | 27,905 psi | 58% | 2402 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 36,564 psi | 76% | 2552 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 32,489 psi | 68% | 2526 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 39,073 psi | 82% | 2684 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 38,450 psi | 80% | 2644 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,350 psi | 84% | 2621 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 37,913 psi | 79% | 2648 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,593 psi | 76% | 2510 fps | 95.8% |
| Hodgdon BL-C2 | 26.8 gr | 82% | 33,924 psi | 71% | 2549 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 36,129 psi | 75% | 2569 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 86% | 39,276 psi | 82% | 2644 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 37,811 psi | 79% | 2654 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,947 psi | 52% | 1552 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 40,074 psi | 84% | 2641 fps | 95.3% |
| IMR 3031 | 23 gr | 80% | 28,500 psi | 60% | 2431 fps | 97% |
| IMR 4895 | <<locked>> | 90% | 40,480 psi | 85% | 2697 fps | 95% |
| IMR 8208 XBR | <<locked>> | 82% | 36,564 psi | 76% | 2552 fps | 95.1% |
| Lovex D073.5 | <<locked>> | 80% | 37,913 psi | 79% | 2582 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 82% | 32,271 psi | 67% | 2503 fps | 95.7% |
| Lovex S062 | <<locked>> | 88% | 36,506 psi | 76% | 2566 fps | 95.3% |
| Norma 201 | <<locked>> | 84% | 35,868 psi | 75% | 2536 fps | 95% |
| Norma 202 | <<locked>> | 80% | 31,618 psi | 66% | 2461 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,772 psi | 52% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,682 psi | 81% | 2598 fps | 97.3% |
| ReloadSwiss RS 60 | 29 gr | 90% | 34,156 psi | 71% | 2598 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 35,389 psi | 74% | 2513 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 86% | 36,463 psi | 76% | 2543 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 94% | 37,826 psi | 79% | 2635 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,271 psi | 67% | 2503 fps | 95.7% |
| Shooters World Precision | <<locked>> | 88% | 36,506 psi | 76% | 2566 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,489 psi | 70% | 2425 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,137 psi | 57% | 2280 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 36,216 psi | 76% | 2566 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 32,895 psi | 69% | 2428 fps | 97.5% |
| Somchem S355 | <<locked>> | 94% | 39,334 psi | 82% | 2648 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 38,116 psi | 80% | 2523 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 33,373 psi | 70% | 2438 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 28,340 psi | 59% | 2392 fps | 98% |
| Vihtavuori N140 | <<locked>> | 80% | 29,747 psi | 62% | 2395 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 92% | 35,259 psi | 74% | 2539 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 82% | 36,448 psi | 76% | 2546 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 82% | 30,414 psi | 64% | 2425 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 35,056 psi | 73% | 2579 fps | 95.7% |
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 47 powders for 6 x 52 R BB2 loaded with the .243 | 88gr | Warner Tool Co. Flat Line. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,779 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 47 of the 47 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 88.0 gr projectile in 0.243" calls for a 1:7.5 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, IMR 3031, Hodgdon BL-C2 rank at the top here: for 6 x 52 R BB2 with the .243 | 88gr | Warner Tool Co. Flat Line 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.