Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 75gr | Impala LW CFN bullet and 35 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Accurate 4064 and Lovex D073.6.
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>> | 84% | 42,047 psi | 88% | 2844 fps | 99.7% |
| Accurate 2460 | <<locked>> | 82% | 42,888 psi | 90% | 2881 fps | 97.9% |
| Accurate 2495 | <<locked>> | 90% | 41,930 psi | 88% | 2897 fps | 99.8% |
| Accurate 2520 | <<locked>> | 86% | 43,004 psi | 90% | 2923 fps | 97.6% |
| Accurate 4064 | <<locked>> | 92% | 41,510 psi | 87% | 2913 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 86% | 40,857 psi | 85% | 2913 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 42,888 psi | 90% | 2844 fps | 96.4% |
| Hodgdon BL-C2 | <<locked>> | 86% | 41,031 psi | 86% | 2900 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 82% | 42,786 psi | 89% | 2913 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,953 psi | 71% | 1913 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 41,930 psi | 88% | 2956 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 82% | 42,554 psi | 89% | 2874 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 88% | 41,437 psi | 87% | 2900 fps | 97.2% |
| Lovex S062 | <<locked>> | 92% | 43,018 psi | 90% | 2900 fps | 95.9% |
| Norma 201 | <<locked>> | 88% | 42,917 psi | 90% | 2884 fps | 95.8% |
| Norma 202 | <<locked>> | 88% | 42,511 psi | 89% | 2904 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,519 psi | 72% | 1965 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 42,685 psi | 89% | 2884 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 43,105 psi | 90% | 3012 fps | 96.9% |
| Rottweil R 901 | <<locked>> | 84% | 42,235 psi | 88% | 2854 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 90% | 43,105 psi | 90% | 2877 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 41,437 psi | 87% | 2900 fps | 97.2% |
| Shooters World Precision | <<locked>> | 92% | 43,018 psi | 90% | 2900 fps | 95.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 42,090 psi | 88% | 2805 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 41,075 psi | 86% | 2799 fps | 98.6% |
| Somchem S321 | <<locked>> | 84% | 43,192 psi | 90% | 2913 fps | 96.2% |
| Somchem S335 | <<locked>> | 86% | 41,742 psi | 87% | 2815 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 82% | 42,409 psi | 89% | 2815 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 86% | 41,684 psi | 87% | 2812 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 90% | 41,162 psi | 86% | 2881 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 90% | 42,627 psi | 89% | 2881 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 96% | 41,727 psi | 87% | 2867 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 86% | 43,047 psi | 90% | 2884 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 90% | 41,437 psi | 87% | 2867 fps | 97.8% |
| Winchester 748 | <<locked>> | 86% | 41,350 psi | 86% | 2917 fps | 96.3% |
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% | 37,318 psi | 78% | 2743 fps | 99% |
| Accurate 2460 | <<locked>> | 80% | 40,248 psi | 84% | 2825 fps | 97.3% |
| Accurate 2495 | <<locked>> | 80% | 30,879 psi | 65% | 2638 fps | 97.8% |
| Accurate 2520 | <<locked>> | 80% | 35,433 psi | 74% | 2753 fps | 95.4% |
| Accurate 4064 | 26.8 gr | 82% | 31,038 psi | 65% | 2654 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 34,084 psi | 71% | 2759 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 40,321 psi | 84% | 2785 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 84% | 38,159 psi | 80% | 2835 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 40,393 psi | 84% | 2864 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,483 psi | 53% | 1716 fps | 100% |
| IMR 3031 | 25.8 gr | 80% | 32,764 psi | 68% | 2736 fps | 97.3% |
| Lovex D073.5 | <<locked>> | 80% | 39,987 psi | 84% | 2818 fps | 95.9% |
| Lovex D073.6 | 28.2 gr | 82% | 34,330 psi | 72% | 2736 fps | 95% |
| Lovex S062 | <<locked>> | 90% | 40,770 psi | 85% | 2854 fps | 95.2% |
| Norma 201 | <<locked>> | 86% | 40,611 psi | 85% | 2835 fps | 95.1% |
| Norma 202 | <<locked>> | 80% | 33,243 psi | 69% | 2684 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,744 psi | 54% | 1759 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,045 psi | 84% | 2828 fps | 96.4% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 40,567 psi | 85% | 2949 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 37,652 psi | 79% | 2749 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 88% | 40,814 psi | 85% | 2831 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 34,330 psi | 72% | 2736 fps | 95% |
| Shooters World Precision | <<locked>> | 90% | 40,770 psi | 85% | 2854 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,244 psi | 74% | 2651 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 30,734 psi | 64% | 2556 fps | 95.7% |
| Somchem S321 | <<locked>> | 82% | 40,596 psi | 85% | 2858 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 35,012 psi | 73% | 2661 fps | 97% |
| Vihtavuori N130 | <<locked>> | 80% | 39,755 psi | 83% | 2759 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 80% | 34,911 psi | 73% | 2664 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 80% | 30,342 psi | 63% | 2625 fps | 97.5% |
| Vihtavuori N140 | <<locked>> | 80% | 31,531 psi | 66% | 2618 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 94% | 39,102 psi | 82% | 2812 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 84% | 40,335 psi | 84% | 2825 fps | 95% |
| Vihtavuori N540 | <<locked>> | 84% | 34,272 psi | 72% | 2703 fps | 95.6% |
| Winchester 748 | <<locked>> | 84% | 38,885 psi | 81% | 2858 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 35 powders for 6 x 52 R BB2 loaded with the .243 | 75gr | Impala LW CFN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,012 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 35 of the 35 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 75.0 gr projectile in 0.243" calls for a 1:10.0 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. IMR 3031, Accurate 4064, Lovex D073.6 rank at the top here: for 6 x 52 R BB2 with the .243 | 75gr | Impala LW CFN 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.