Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 75gr | Barnes X S bullet and 33 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Lovex D073.6 and Shooters World Match Rifle.
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% | 41,539 psi | 87% | 2831 fps | 99.6% |
| Accurate 2460 | <<locked>> | 82% | 42,424 psi | 89% | 2867 fps | 97.8% |
| Accurate 2495 | <<locked>> | 90% | 41,089 psi | 86% | 2877 fps | 99.7% |
| Accurate 2520 | <<locked>> | 86% | 42,554 psi | 89% | 2910 fps | 97.5% |
| Accurate 4064 | <<locked>> | 92% | 41,060 psi | 86% | 2897 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 88% | 43,221 psi | 90% | 2956 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 42,496 psi | 89% | 2828 fps | 96.2% |
| Hodgdon BL-C2 | <<locked>> | 88% | 43,004 psi | 90% | 2940 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 82% | 42,308 psi | 88% | 2900 fps | 98.8% |
| Hodgdon H335 | <<locked>> | 82% | 43,091 psi | 90% | 2913 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,997 psi | 71% | 1906 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 41,046 psi | 86% | 2933 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 82% | 42,134 psi | 88% | 2861 fps | 96.5% |
| Lovex D073.6 | <<locked>> | 88% | 40,988 psi | 86% | 2890 fps | 97.1% |
| Lovex S062 | <<locked>> | 92% | 42,627 psi | 89% | 2887 fps | 95.6% |
| Norma 202 | <<locked>> | 88% | 42,105 psi | 88% | 2890 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,156 psi | 71% | 1952 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 42,279 psi | 88% | 2871 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 42,554 psi | 89% | 2992 fps | 96.6% |
| Rottweil R 901 | <<locked>> | 84% | 41,742 psi | 87% | 2841 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 40,988 psi | 86% | 2890 fps | 97.1% |
| Shooters World Precision | <<locked>> | 92% | 42,627 psi | 89% | 2887 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 41,640 psi | 87% | 2792 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 43,018 psi | 90% | 2831 fps | 98.9% |
| Somchem S321 | <<locked>> | 84% | 42,888 psi | 90% | 2904 fps | 96% |
| Somchem S335 | <<locked>> | 86% | 41,002 psi | 86% | 2795 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 82% | 41,974 psi | 88% | 2802 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 86% | 41,220 psi | 86% | 2799 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 92% | 43,163 psi | 90% | 2917 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 90% | 42,264 psi | 88% | 2867 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 96% | 41,075 psi | 86% | 2848 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 90% | 40,698 psi | 85% | 2848 fps | 97.5% |
| Winchester 748 | <<locked>> | 86% | 41,031 psi | 86% | 2904 fps | 96.1% |
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% | 36,811 psi | 77% | 2726 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 39,798 psi | 83% | 2812 fps | 97.1% |
| Accurate 2495 | <<locked>> | 80% | 30,443 psi | 64% | 2625 fps | 97.6% |
| Accurate 2520 | <<locked>> | 80% | 35,056 psi | 73% | 2740 fps | 95.2% |
| Accurate 4064 | <<locked>> | 84% | 32,372 psi | 68% | 2690 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 33,649 psi | 70% | 2746 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 39,914 psi | 83% | 2772 fps | 95.4% |
| Hodgdon BL-C2 | <<locked>> | 86% | 40,292 psi | 84% | 2881 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 39,900 psi | 83% | 2848 fps | 98.3% |
| Hodgdon H335 | <<locked>> | 80% | 40,466 psi | 85% | 2858 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,440 psi | 53% | 1709 fps | 100% |
| IMR 3031 | 25.5 gr | 80% | 32,329 psi | 68% | 2717 fps | 97% |
| Lovex D073.5 | <<locked>> | 80% | 39,581 psi | 83% | 2805 fps | 95.7% |
| Lovex D073.6 | 28.5 gr | 84% | 35,926 psi | 75% | 2772 fps | 95.5% |
| Lovex S062 | <<locked>> | 90% | 40,408 psi | 84% | 2841 fps | 95% |
| Norma 202 | <<locked>> | 80% | 33,127 psi | 69% | 2677 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,686 psi | 54% | 1755 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 39,624 psi | 83% | 2812 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 39,943 psi | 83% | 2927 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 37,550 psi | 78% | 2743 fps | 96.4% |
| Shooters World Match Rifle | 28.5 gr | 84% | 35,926 psi | 75% | 2772 fps | 95.5% |
| Shooters World Precision | <<locked>> | 90% | 40,408 psi | 84% | 2841 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,186 psi | 74% | 2644 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 30,414 psi | 64% | 2539 fps | 95.4% |
| Somchem S321 | <<locked>> | 82% | 40,248 psi | 84% | 2844 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 34,606 psi | 72% | 2648 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 80% | 39,653 psi | 83% | 2753 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 80% | 34,824 psi | 73% | 2657 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 80% | 30,226 psi | 63% | 2615 fps | 97.4% |
| Vihtavuori N140 | <<locked>> | 82% | 33,257 psi | 69% | 2661 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 94% | 38,769 psi | 81% | 2799 fps | 95% |
| Vihtavuori N540 | <<locked>> | 84% | 33,982 psi | 71% | 2690 fps | 95.4% |
| Winchester 748 | <<locked>> | 84% | 38,450 psi | 80% | 2844 fps | 95.3% |
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 33 powders for 6 x 52 R BB2 loaded with the .243 | 75gr | Barnes X S. ReloadSwiss RS 60 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 33 of the 33 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 1:9.5 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. IMR 3031, Lovex D073.6, Shooters World Match Rifle rank at the top here: for 6 x 52 R BB2 with the .243 | 75gr | Barnes X S 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.