Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 80gr | Frontier BTSP bullet and 37 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 Hodgdon H335.
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>> | 92% | 41,800 psi | 87% | 2703 fps | 99.3% |
| Accurate 2460 | <<locked>> | 90% | 43,004 psi | 90% | 2743 fps | 97.2% |
| Accurate 2495ᴾ | <<locked>> | 100% | 41,713 psi | 87% | 2772 fps | 99.5% |
| Accurate 2520 | <<locked>> | 94% | 43,236 psi | 90% | 2785 fps | 96.9% |
| Accurate 4064ᴾ | <<locked>> | 100% | 38,783 psi | 81% | 2730 fps | 97.1% |
| Accurate LT-30 | <<locked>> | 84% | 42,525 psi | 89% | 2631 fps | 98.3% |
| Accurate LT-32 | <<locked>> | 84% | 42,902 psi | 90% | 2638 fps | 96.6% |
| ADI AR 2207 | <<locked>> | 82% | 41,989 psi | 88% | 2684 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 42,409 psi | 89% | 2756 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 94% | 41,002 psi | 86% | 2776 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 42,743 psi | 89% | 2736 fps | 99.8% |
| Alliant Reloder-7 | <<locked>> | 82% | 43,250 psi | 90% | 2684 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 40,785 psi | 85% | 2615 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 88% | 41,423 psi | 87% | 2736 fps | 98% |
| Hodgdon H335 | <<locked>> | 88% | 42,221 psi | 88% | 2753 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,169 psi | 67% | 1742 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 41,553 psi | 87% | 2805 fps | 98.8% |
| IMR 4198 | <<locked>> | 86% | 41,481 psi | 87% | 2671 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 43,178 psi | 90% | 2743 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 96% | 40,756 psi | 85% | 2753 fps | 96.2% |
| Norma 200 | <<locked>> | 84% | 42,453 psi | 89% | 2713 fps | 100% |
| Norma 202 | <<locked>> | 96% | 42,583 psi | 89% | 2762 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,184 psi | 67% | 1785 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 41,234 psi | 86% | 2707 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 92% | 41,727 psi | 87% | 2707 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 96% | 40,756 psi | 85% | 2753 fps | 96.2% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 43,236 psi | 90% | 2766 fps | 97.4% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 43,221 psi | 90% | 2740 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 40,350 psi | 84% | 2621 fps | 96.6% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 41,582 psi | 87% | 2661 fps | 98% |
| Somchem S335 | <<locked>> | 94% | 41,814 psi | 87% | 2674 fps | 97.9% |
| Vihtavuori N120 | <<locked>> | 82% | 42,148 psi | 88% | 2641 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 43,105 psi | 90% | 2684 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 94% | 42,714 psi | 89% | 2687 fps | 99.3% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 42,873 psi | 90% | 2779 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 98% | 43,033 psi | 90% | 2743 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 98% | 41,191 psi | 86% | 2723 fps | 96.9% |
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% | 28,776 psi | 60% | 2411 fps | 95.9% |
| Accurate 2460 | <<locked>> | 86% | 37,318 psi | 78% | 2628 fps | 95.7% |
| Accurate 2495 | <<locked>> | 86% | 26,208 psi | 55% | 2415 fps | 95.3% |
| Accurate 2520 | <<locked>> | 90% | 37,376 psi | 78% | 2671 fps | 95.2% |
| Accurate 4064 | <<locked>> | 96% | 33,982 psi | 71% | 2625 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 37,391 psi | 78% | 2530 fps | 97.2% |
| Accurate LT-32 | <<locked>> | 80% | 37,768 psi | 79% | 2533 fps | 95.1% |
| ADI AR 2207 | <<locked>> | 80% | 39,479 psi | 82% | 2638 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 34,679 psi | 72% | 2589 fps | 96.1% |
| Alliant AR-Comp | 21.2 gr | 80% | 26,310 psi | 55% | 2415 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,156 psi | 69% | 2536 fps | 98.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 40,770 psi | 85% | 2638 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,766 psi | 75% | 2513 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 31,908 psi | 67% | 2520 fps | 95% |
| Hodgdon H335 | 24.6 gr | 84% | 36,753 psi | 77% | 2638 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,873 psi | 50% | 1562 fps | 100% |
| IMR 3031 | 22.8 gr | 86% | 30,516 psi | 64% | 2539 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 35,012 psi | 73% | 2536 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 88% | 40,205 psi | 84% | 2687 fps | 95% |
| Lovex D073.6 | <<locked>> | 94% | 37,855 psi | 79% | 2694 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 37,260 psi | 78% | 2612 fps | 99.6% |
| Norma 202 | <<locked>> | 90% | 35,230 psi | 74% | 2608 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,612 psi | 49% | 1594 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 38,464 psi | 80% | 2648 fps | 95% |
| Rottweil R 901 | <<locked>> | 88% | 36,796 psi | 77% | 2602 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 94% | 37,855 psi | 79% | 2694 fps | 95.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 35,128 psi | 73% | 2592 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 33,518 psi | 70% | 2533 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 35,824 psi | 75% | 2526 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 32,445 psi | 68% | 2467 fps | 95.3% |
| Somchem S335 | <<locked>> | 86% | 32,938 psi | 69% | 2484 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 39,639 psi | 83% | 2598 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 31,705 psi | 66% | 2448 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 80% | 27,557 psi | 58% | 2346 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 86% | 27,717 psi | 58% | 2434 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 92% | 35,317 psi | 74% | 2582 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 94% | 36,318 psi | 76% | 2618 fps | 95.4% |
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 37 powders for 6 x 52 R Bretschneider loaded with the .243 | 80gr | Frontier BTSP. IMR 3031 delivers the highest muzzle velocity at 2,805 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,805 fps. Accurate 2495 gives the best case fill at 100 %, and 37 of the 37 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 80.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Hodgdon TrailBoss 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, Hodgdon H335 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 80gr | Frontier BTSP 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.