Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 75gr | Barnes BND SPIT-FIRE bullet and 36 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% | 42,351 psi | 88% | 2867 fps | 99.6% |
| Accurate 2460 | <<locked>> | 84% | 40,495 psi | 85% | 2848 fps | 97.3% |
| Accurate 2495 | <<locked>> | 94% | 40,640 psi | 85% | 2894 fps | 99.7% |
| Accurate 2520 | <<locked>> | 88% | 40,915 psi | 85% | 2894 fps | 97% |
| Accurate 4064 | <<locked>> | 96% | 40,741 psi | 85% | 2917 fps | 98.1% |
| ADI AR 2219 | <<locked>> | 82% | 42,250 psi | 88% | 2913 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 90% | 41,640 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 42,728 psi | 89% | 2894 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 42,757 psi | 89% | 2812 fps | 99.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 41,640 psi | 87% | 2825 fps | 95.8% |
| Hodgdon BL-C2 | <<locked>> | 90% | 41,713 psi | 87% | 2930 fps | 96% |
| Hodgdon H322 | <<locked>> | 84% | 41,379 psi | 86% | 2897 fps | 98.6% |
| Hodgdon H335 | <<locked>> | 84% | 42,119 psi | 88% | 2910 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,257 psi | 69% | 1900 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,308 psi | 88% | 2979 fps | 99.4% |
| IMR 4198 | <<locked>> | 82% | 41,191 psi | 86% | 2825 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 43,236 psi | 90% | 2904 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 92% | 41,669 psi | 87% | 2920 fps | 97.2% |
| Norma 202 | <<locked>> | 92% | 42,931 psi | 90% | 2927 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,243 psi | 69% | 1942 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 41,263 psi | 86% | 2867 fps | 96.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 41,336 psi | 86% | 2972 fps | 96% |
| Rottweil R 901 | <<locked>> | 88% | 41,887 psi | 88% | 2867 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 92% | 41,669 psi | 87% | 2920 fps | 97.2% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 43,033 psi | 90% | 2920 fps | 98% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 43,105 psi | 90% | 2897 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 43,163 psi | 90% | 2838 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 41,887 psi | 88% | 2825 fps | 98.7% |
| Somchem S335 | <<locked>> | 90% | 41,887 psi | 88% | 2831 fps | 98.5% |
| Vihtavuori N130 | <<locked>> | 84% | 40,422 psi | 84% | 2789 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 90% | 42,786 psi | 89% | 2844 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 94% | 41,350 psi | 86% | 2900 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 94% | 43,294 psi | 90% | 2904 fps | 98.5% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 42,409 psi | 89% | 2890 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 94% | 41,858 psi | 87% | 2887 fps | 97.7% |
| Winchester 748 | <<locked>> | 90% | 42,351 psi | 88% | 2949 fps | 96.5% |
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% | 32,779 psi | 68% | 2654 fps | 97.9% |
| Accurate 2460 | <<locked>> | 80% | 35,201 psi | 74% | 2726 fps | 95.7% |
| Accurate 2495 | <<locked>> | 80% | 25,440 psi | 53% | 2510 fps | 95.4% |
| Accurate 2520 | <<locked>> | 84% | 35,418 psi | 74% | 2772 fps | 95.3% |
| Accurate 4064 | 28 gr | 88% | 31,212 psi | 65% | 2690 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 39,697 psi | 83% | 2861 fps | 98.2% |
| Alliant AR-Comp | 25.2 gr | 80% | 30,110 psi | 63% | 2674 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,797 psi | 79% | 2792 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,045 psi | 84% | 2756 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 38,899 psi | 81% | 2766 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 88% | 38,870 psi | 81% | 2867 fps | 95.1% |
| Hodgdon H322 | <<locked>> | 80% | 36,201 psi | 76% | 2779 fps | 97.3% |
| Hodgdon H335 | <<locked>> | 80% | 36,666 psi | 77% | 2789 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,540 psi | 51% | 1699 fps | 100% |
| IMR 3031 | 25.1 gr | 80% | 28,558 psi | 60% | 2628 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 38,696 psi | 81% | 2772 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 37,565 psi | 78% | 2779 fps | 95% |
| Lovex D073.6 | <<locked>> | 88% | 36,434 psi | 76% | 2808 fps | 95.6% |
| Norma 202 | <<locked>> | 84% | 33,388 psi | 70% | 2707 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,279 psi | 51% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 38,493 psi | 80% | 2805 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 39,059 psi | 82% | 2913 fps | 95% |
| Rottweil R 901 | <<locked>> | 82% | 34,795 psi | 73% | 2703 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 36,434 psi | 76% | 2808 fps | 95.6% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,176 psi | 84% | 2858 fps | 97.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,058 psi | 80% | 2792 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 33,460 psi | 70% | 2621 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 30,821 psi | 64% | 2572 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 31,024 psi | 65% | 2579 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 35,839 psi | 75% | 2690 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 80% | 31,241 psi | 65% | 2589 fps | 97.3% |
| Vihtavuori N135 | <<locked>> | 80% | 26,266 psi | 55% | 2523 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 86% | 33,678 psi | 70% | 2694 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 98% | 39,508 psi | 83% | 2831 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 88% | 34,737 psi | 73% | 2730 fps | 95.6% |
| Winchester 748 | <<locked>> | 88% | 39,914 psi | 83% | 2894 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 36 powders for 6 x 52 R BB2 loaded with the .243 | 75gr | Barnes BND SPIT-FIRE. IMR 3031 delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,900 fps to 2,979 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 36 of the 36 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 75.0 gr projectile in 0.243" calls for a 1:9.0 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 | Barnes BND SPIT-FIRE 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.