Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 75gr | Ferrobull Entox Sport bullet and 38 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, IMR 3031 and Accurate 4064.
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>> | 88% | 41,858 psi | 87% | 2874 fps | 99.7% |
| Accurate 2460 | <<locked>> | 86% | 43,221 psi | 90% | 2920 fps | 98.1% |
| Accurate 2495 | <<locked>> | 96% | 43,149 psi | 90% | 2959 fps | 99.9% |
| Accurate 2520 | <<locked>> | 88% | 40,712 psi | 85% | 2907 fps | 97.2% |
| Accurate 4064 | <<locked>> | 98% | 42,786 psi | 89% | 2976 fps | 98.7% |
| ADI AR 2219 | <<locked>> | 82% | 42,380 psi | 89% | 2933 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 90% | 41,713 psi | 87% | 2959 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 42,438 psi | 89% | 2904 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 42,801 psi | 89% | 2825 fps | 99.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 41,263 psi | 86% | 2835 fps | 96% |
| Hodgdon BL-C2 | <<locked>> | 90% | 41,495 psi | 87% | 2940 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 84% | 41,539 psi | 87% | 2917 fps | 98.8% |
| Hodgdon H335 | <<locked>> | 84% | 42,134 psi | 88% | 2923 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,793 psi | 69% | 1906 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,351 psi | 88% | 2992 fps | 99.5% |
| IMR 4198 | <<locked>> | 82% | 41,278 psi | 86% | 2841 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 42,873 psi | 90% | 2913 fps | 96.9% |
| Lovex D073.6 | <<locked>> | 92% | 41,843 psi | 87% | 2943 fps | 97.4% |
| Norma 201 | <<locked>> | 92% | 43,091 psi | 90% | 2920 fps | 95.9% |
| Norma 202 | <<locked>> | 90% | 40,379 psi | 84% | 2887 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,706 psi | 68% | 1949 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 40,915 psi | 85% | 2877 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 41,379 psi | 86% | 2992 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 88% | 41,539 psi | 87% | 2881 fps | 97.7% |
| Rottweil R 902 | <<locked>> | 94% | 43,279 psi | 90% | 2913 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 41,843 psi | 87% | 2943 fps | 97.4% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 43,018 psi | 90% | 2936 fps | 98.2% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 40,408 psi | 84% | 2858 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 43,207 psi | 90% | 2854 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 41,843 psi | 87% | 2838 fps | 98.8% |
| Somchem S335 | <<locked>> | 90% | 41,756 psi | 87% | 2844 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 86% | 43,076 psi | 90% | 2854 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 42,902 psi | 90% | 2864 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 94% | 41,292 psi | 86% | 2913 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 92% | 40,654 psi | 85% | 2867 fps | 98.1% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 42,612 psi | 89% | 2910 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 94% | 42,047 psi | 88% | 2907 fps | 98% |
| Winchester 748 | <<locked>> | 90% | 42,670 psi | 89% | 2969 fps | 96.8% |
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% | 32,358 psi | 68% | 2661 fps | 98% |
| Accurate 2460 | <<locked>> | 80% | 34,954 psi | 73% | 2740 fps | 95.8% |
| Accurate 2495 | <<locked>> | 80% | 24,598 psi | 51% | 2500 fps | 95.2% |
| Accurate 2520 | <<locked>> | 84% | 35,215 psi | 74% | 2782 fps | 95.5% |
| Accurate 4064 | 28.7 gr | 88% | 30,690 psi | 64% | 2694 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 39,465 psi | 82% | 2871 fps | 98.3% |
| Alliant AR-Comp | 25.8 gr | 80% | 29,791 psi | 62% | 2680 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,144 psi | 78% | 2792 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,103 psi | 84% | 2772 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 38,943 psi | 81% | 2782 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 88% | 38,667 psi | 81% | 2877 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 35,955 psi | 75% | 2792 fps | 97.5% |
| Hodgdon H335 | <<locked>> | 80% | 36,666 psi | 77% | 2805 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,265 psi | 51% | 1709 fps | 100% |
| IMR 3031 | 25.8 gr | 80% | 28,500 psi | 60% | 2644 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 38,798 psi | 81% | 2789 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 37,246 psi | 78% | 2792 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 88% | 36,216 psi | 76% | 2818 fps | 95.8% |
| Norma 201 | <<locked>> | 90% | 40,205 psi | 84% | 2858 fps | 95.1% |
| Norma 202 | <<locked>> | 84% | 32,982 psi | 69% | 2713 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,308 psi | 51% | 1752 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 35,955 psi | 75% | 2759 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 38,682 psi | 81% | 2927 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 82% | 34,476 psi | 72% | 2717 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 92% | 40,799 psi | 85% | 2864 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 36,216 psi | 76% | 2818 fps | 95.8% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,205 psi | 84% | 2874 fps | 97.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,956 psi | 79% | 2805 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 33,141 psi | 69% | 2631 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 30,472 psi | 64% | 2579 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 30,545 psi | 64% | 2582 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 35,592 psi | 74% | 2700 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 80% | 30,995 psi | 65% | 2595 fps | 97.4% |
| Vihtavuori N135 | <<locked>> | 80% | 25,875 psi | 54% | 2530 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 84% | 31,314 psi | 65% | 2648 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 98% | 39,595 psi | 83% | 2848 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 88% | 34,505 psi | 72% | 2740 fps | 95.8% |
| Winchester 748 | <<locked>> | 86% | 37,144 psi | 78% | 2848 fps | 95% |
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 38 powders for 6 x 52 R BB2 loaded with the .243 | 75gr | Ferrobull Entox Sport. IMR 3031 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,906 fps to 2,992 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 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 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, Vihtavuori N150 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. Alliant AR-Comp, IMR 3031, Accurate 4064 rank at the top here: for 6 x 52 R BB2 with the .243 | 75gr | Ferrobull Entox Sport 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.