Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 66gr | SUS-TAC HPT bullet and 23 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Accurate 2015 and Alliant Reloder-10x.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 42,453 psi | 89% | 2884 fps | 98.8% |
| Accurate 2015 | <<locked>> | 96% | 41,974 psi | 88% | 2959 fps | 98% |
| Accurate 2495ᴾ | <<locked>> | 100% | 35,752 psi | 75% | 2900 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 88% | 43,091 psi | 90% | 2887 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 86% | 42,279 psi | 88% | 2963 fps | 100% |
| Alliant AR-Comp | <<locked>> | 98% | 41,060 psi | 86% | 3035 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 92% | 42,438 psi | 89% | 2995 fps | 99% |
| Alliant Reloder-7 | <<locked>> | 84% | 41,684 psi | 87% | 2917 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 41,684 psi | 87% | 2871 fps | 96.8% |
| Hodgdon H322 | <<locked>> | 92% | 41,974 psi | 88% | 2995 fps | 96.2% |
| Hodgdon H4198 | <<locked>> | 84% | 42,511 psi | 89% | 2890 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,560 psi | 66% | 1926 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 41,466 psi | 87% | 3048 fps | 97% |
| IMR 4198 | <<locked>> | 90% | 42,076 psi | 88% | 2943 fps | 99.4% |
| Norma 200 | <<locked>> | 88% | 42,496 psi | 89% | 2979 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,937 psi | 65% | 1962 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 43,178 psi | 90% | 2730 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 40,625 psi | 85% | 2943 fps | 96.9% |
| Somchem S335 | <<locked>> | 98% | 41,974 psi | 88% | 2917 fps | 96.1% |
| Vihtavuori N120 | <<locked>> | 86% | 42,380 psi | 89% | 2920 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 41,031 psi | 86% | 2897 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 98% | 42,743 psi | 89% | 2936 fps | 98% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 37,275 psi | 78% | 2913 fps | 97.1% |
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 1680 | <<locked>> | 80% | 39,668 psi | 83% | 2828 fps | 98.3% |
| Accurate 2015 | 23.9 gr | 88% | 32,430 psi | 68% | 2740 fps | 95.2% |
| Accurate 2495 | <<locked>> | 96% | 30,748 psi | 64% | 2776 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 84% | 38,537 psi | 81% | 2789 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 34,911 psi | 73% | 2805 fps | 99.7% |
| Alliant AR-Comp | 23.6 gr | 86% | 28,123 psi | 59% | 2690 fps | 95.9% |
| Alliant Reloder-10x | 21.4 gr | 80% | 29,080 psi | 61% | 2667 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 36,724 psi | 77% | 2805 fps | 98.1% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 36,332 psi | 76% | 2756 fps | 95.1% |
| Hodgdon H322 | <<locked>> | 90% | 39,175 psi | 82% | 2933 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 82% | 39,726 psi | 83% | 2831 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,814 psi | 48% | 1716 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 36,579 psi | 76% | 2933 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 31,531 psi | 66% | 2690 fps | 97% |
| Norma 200 | <<locked>> | 80% | 33,011 psi | 69% | 2762 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,829 psi | 48% | 1762 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 38,435 psi | 80% | 2644 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 36,129 psi | 75% | 2838 fps | 95.4% |
| Somchem S335 | <<locked>> | 96% | 39,276 psi | 82% | 2861 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 35,114 psi | 73% | 2772 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 30,095 psi | 63% | 2635 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 90% | 33,228 psi | 69% | 2723 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 96% | 33,228 psi | 69% | 2812 fps | 95.6% |
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 23 powders for 6 x 52 R Bretschneider loaded with the .243 | 66gr | SUS-TAC HPT. IMR 3031 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,048 fps. Accurate 2495 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 66.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, IMR 3031 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, Accurate 2015, Alliant Reloder-10x rank at the top here: for 6 x 52 R Bretschneider with the .243 | 66gr | SUS-TAC HPT 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.