Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 68gr | Barnes Match Burner BT bullet and 27 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 Hodgdon H322.
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% | 42,206 psi | 88% | 2946 fps | 98.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,421 psi | 82% | 2959 fps | 98.4% |
| Accurate LT-30 | <<locked>> | 86% | 43,134 psi | 90% | 2874 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 84% | 42,322 psi | 88% | 2940 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 40,596 psi | 85% | 2953 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 96% | 41,582 psi | 87% | 3028 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 90% | 42,772 psi | 89% | 2982 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,568 psi | 87% | 2894 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,524 psi | 87% | 2851 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 90% | 41,974 psi | 88% | 2982 fps | 97% |
| Hodgdon H335 | <<locked>> | 90% | 43,047 psi | 90% | 2999 fps | 96.2% |
| Hodgdon H4198 | <<locked>> | 82% | 42,206 psi | 88% | 2874 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,981 psi | 67% | 1926 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 41,945 psi | 88% | 3045 fps | 97.9% |
| IMR 4198 | <<locked>> | 88% | 42,380 psi | 89% | 2930 fps | 99.7% |
| Norma 200 | <<locked>> | 86% | 43,004 psi | 90% | 2966 fps | 99.7% |
| Norma 202 | <<locked>> | 98% | 42,815 psi | 89% | 2995 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,836 psi | 67% | 1969 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,772 psi | 89% | 2697 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 40,973 psi | 86% | 2933 fps | 97.6% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,784 psi | 83% | 2844 fps | 96.4% |
| Somchem S335 | <<locked>> | 96% | 42,366 psi | 89% | 2913 fps | 97% |
| Vihtavuori N120 | <<locked>> | 84% | 42,467 psi | 89% | 2894 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,292 psi | 86% | 2884 fps | 99% |
| Vihtavuori N133 | <<locked>> | 96% | 43,149 psi | 90% | 2930 fps | 98.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,654 psi | 85% | 2969 fps | 98.5% |
| Vihtavuori N140 | <<locked>> | 98% | 40,814 psi | 85% | 2923 fps | 96% |
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>> | 84% | 30,835 psi | 64% | 2677 fps | 95.3% |
| Accurate 2495 | <<locked>> | 92% | 29,631 psi | 62% | 2723 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 35,853 psi | 75% | 2713 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 37,304 psi | 78% | 2838 fps | 100% |
| ADI AR 2219 | <<locked>> | 84% | 38,014 psi | 79% | 2890 fps | 95.8% |
| Alliant AR-Comp | 23.5 gr | 82% | 26,658 psi | 56% | 2628 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,198 psi | 65% | 2707 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,885 psi | 81% | 2838 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,200 psi | 71% | 2687 fps | 95.2% |
| Hodgdon H322 | 25.4 gr | 86% | 36,767 psi | 77% | 2861 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 88% | 39,900 psi | 83% | 2933 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 39,523 psi | 83% | 2815 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,511 psi | 49% | 1722 fps | 100% |
| IMR 3031 | 26.3 gr | 92% | 34,737 psi | 73% | 2871 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 33,141 psi | 69% | 2717 fps | 98.1% |
| Norma 200 | <<locked>> | 80% | 35,679 psi | 75% | 2805 fps | 98.6% |
| Norma 202 | <<locked>> | 96% | 40,538 psi | 85% | 2949 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,148 psi | 48% | 1759 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,480 psi | 85% | 2657 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 34,185 psi | 71% | 2772 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 37,260 psi | 78% | 2789 fps | 95.6% |
| Somchem S335 | <<locked>> | 92% | 37,275 psi | 78% | 2802 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 37,478 psi | 78% | 2799 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,284 psi | 63% | 2621 fps | 96% |
| Vihtavuori N133 | <<locked>> | 86% | 31,734 psi | 66% | 2667 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 92% | 31,705 psi | 66% | 2756 fps | 95.8% |
| Vihtavuori N140 | <<locked>> | 96% | 38,290 psi | 80% | 2867 fps | 95.2% |
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 27 powders for 6 x 52 R Bretschneider loaded with the .243 | 68gr | Barnes Match Burner BT. IMR 3031 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,045 fps. Accurate 2495 gives the best case fill at 100 %, and 27 of the 27 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 68.0 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. Alliant AR-Comp, IMR 3031, Hodgdon H322 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 68gr | Barnes Match Burner BT 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.