Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 70gr | Berger Target FB bullet and 30 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and SNPE Vectan SP 3.
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>> | 94% | 43,279 psi | 90% | 2927 fps | 98.9% |
| Accurate 2460 | <<locked>> | 90% | 41,510 psi | 87% | 2904 fps | 95.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 40,190 psi | 84% | 2933 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 84% | 41,191 psi | 86% | 2795 fps | 97.2% |
| ADI AR 2207 | <<locked>> | 84% | 43,250 psi | 90% | 2913 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 41,104 psi | 86% | 2923 fps | 97% |
| Alliant AR-Comp | <<locked>> | 96% | 42,177 psi | 88% | 3002 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 40,973 psi | 86% | 2904 fps | 99.3% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,945 psi | 88% | 2861 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 42,003 psi | 88% | 2825 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 90% | 42,511 psi | 89% | 2953 fps | 97.4% |
| Hodgdon H4198 | <<locked>> | 82% | 42,540 psi | 89% | 2841 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,937 psi | 67% | 1893 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 43,091 psi | 90% | 3031 fps | 98.4% |
| IMR 4198 | <<locked>> | 88% | 42,757 psi | 89% | 2897 fps | 99.8% |
| Norma 200 | <<locked>> | 84% | 41,176 psi | 86% | 2890 fps | 99.6% |
| Norma 202 | <<locked>> | 96% | 41,133 psi | 86% | 2923 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,836 psi | 67% | 1936 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 42,728 psi | 89% | 2920 fps | 96.1% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 41,611 psi | 87% | 2923 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 41,901 psi | 88% | 2913 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 42,119 psi | 88% | 2844 fps | 96.1% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 40,335 psi | 84% | 2822 fps | 96.8% |
| Somchem S335 | <<locked>> | 96% | 42,960 psi | 90% | 2884 fps | 97.4% |
| Vihtavuori N120 | <<locked>> | 82% | 40,480 psi | 85% | 2818 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,771 psi | 87% | 2854 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 94% | 41,408 psi | 87% | 2854 fps | 98.5% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 41,292 psi | 86% | 2946 fps | 98.8% |
| Vihtavuori N140 | <<locked>> | 98% | 41,452 psi | 87% | 2897 fps | 96.5% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 43,004 psi | 90% | 2943 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>> | 82% | 29,486 psi | 62% | 2605 fps | 95% |
| Accurate 2460 | <<locked>> | 88% | 38,870 psi | 81% | 2848 fps | 95% |
| Accurate 2495 | <<locked>> | 90% | 28,442 psi | 59% | 2651 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 36,535 psi | 76% | 2694 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 38,101 psi | 80% | 2812 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 35,998 psi | 75% | 2805 fps | 95.4% |
| Alliant AR-Comp | 22.8 gr | 80% | 25,483 psi | 53% | 2552 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,894 psi | 67% | 2690 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 39,697 psi | 83% | 2815 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,548 psi | 72% | 2661 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 84% | 35,186 psi | 74% | 2785 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 40,263 psi | 84% | 2792 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,424 psi | 49% | 1693 fps | 100% |
| IMR 3031 | 25.6 gr | 90% | 33,315 psi | 70% | 2795 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 33,794 psi | 71% | 2697 fps | 98.5% |
| Norma 200 | <<locked>> | 80% | 36,042 psi | 75% | 2776 fps | 98.9% |
| Norma 202 | <<locked>> | 94% | 38,464 psi | 80% | 2864 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,467 psi | 49% | 1736 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 40,045 psi | 84% | 2861 fps | 95.4% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 38,972 psi | 81% | 2867 fps | 95.2% |
| SNPE Vectan SP 3 | 22.3 gr | 80% | 32,648 psi | 68% | 2694 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 39,363 psi | 82% | 2785 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 35,679 psi | 75% | 2717 fps | 95.3% |
| Somchem S335 | <<locked>> | 90% | 35,795 psi | 75% | 2733 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 38,261 psi | 80% | 2772 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,937 psi | 65% | 2605 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 30,385 psi | 63% | 2595 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 90% | 30,023 psi | 63% | 2674 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 94% | 36,753 psi | 77% | 2795 fps | 95% |
| Vihtavuori N540 | <<locked>> | 98% | 40,277 psi | 84% | 2887 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 30 powders for 6 x 52 R Bretschneider loaded with the .243 | 70gr | Berger Target FB. IMR 3031 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,031 fps. Accurate 2495 gives the best case fill at 100 %, and 30 of the 30 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 67–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, 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, Alliant AR-Comp, SNPE Vectan SP 3 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 70gr | Berger Target FB 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.