Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 80gr | Sierra SP SSPistol bullet and 35 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 Lovex D073.6.
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>> | 90% | 41,872 psi | 87% | 2726 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 43,279 psi | 90% | 2772 fps | 97.7% |
| Accurate 2495 | <<locked>> | 98% | 42,670 psi | 89% | 2808 fps | 99.8% |
| Accurate 2520 | <<locked>> | 92% | 43,250 psi | 90% | 2812 fps | 97.4% |
| Accurate 4064ᴾ | <<locked>> | 100% | 42,032 psi | 88% | 2815 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 42,076 psi | 88% | 2651 fps | 98.6% |
| Accurate LT-32 | <<locked>> | 82% | 42,482 psi | 89% | 2657 fps | 97% |
| ADI AR 2219 | <<locked>> | 84% | 42,366 psi | 89% | 2782 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 92% | 41,394 psi | 86% | 2805 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 42,583 psi | 89% | 2756 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 43,062 psi | 90% | 2684 fps | 99% |
| Hodgdon H322 | <<locked>> | 86% | 41,365 psi | 86% | 2762 fps | 98.4% |
| Hodgdon H335 | <<locked>> | 86% | 41,945 psi | 88% | 2772 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,764 psi | 68% | 1778 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 41,872 psi | 87% | 2835 fps | 99.2% |
| IMR 4198 | <<locked>> | 84% | 41,423 psi | 87% | 2694 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 42,757 psi | 89% | 2759 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 94% | 41,379 psi | 86% | 2785 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 42,438 psi | 89% | 2733 fps | 100% |
| Norma 202 | <<locked>> | 94% | 42,772 psi | 89% | 2789 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,779 psi | 68% | 1821 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 41,104 psi | 86% | 2730 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 90% | 41,800 psi | 87% | 2733 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 94% | 41,379 psi | 86% | 2785 fps | 96.9% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 43,033 psi | 90% | 2785 fps | 97.8% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 43,018 psi | 90% | 2759 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 43,105 psi | 90% | 2700 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 41,495 psi | 87% | 2687 fps | 98.4% |
| Somchem S335 | <<locked>> | 92% | 42,047 psi | 88% | 2703 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 88% | 43,192 psi | 90% | 2710 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 92% | 42,583 psi | 89% | 2710 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 98% | 43,236 psi | 90% | 2805 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 96% | 42,975 psi | 90% | 2766 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 96% | 41,481 psi | 87% | 2749 fps | 97.4% |
| Winchester 748 | <<locked>> | 92% | 42,279 psi | 88% | 2808 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% | 30,458 psi | 64% | 2474 fps | 97% |
| Accurate 2460 | <<locked>> | 82% | 35,027 psi | 73% | 2598 fps | 95.4% |
| Accurate 2495 | <<locked>> | 82% | 24,743 psi | 52% | 2382 fps | 95% |
| Accurate 2520 | <<locked>> | 86% | 35,259 psi | 74% | 2644 fps | 95% |
| Accurate 4064 | <<locked>> | 92% | 32,677 psi | 68% | 2612 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 39,392 psi | 82% | 2595 fps | 98.1% |
| Accurate LT-32 | <<locked>> | 80% | 39,755 psi | 83% | 2605 fps | 96.3% |
| ADI AR 2219 | <<locked>> | 80% | 36,970 psi | 77% | 2667 fps | 97.4% |
| Alliant AR-Comp | 22.5 gr | 80% | 28,036 psi | 59% | 2490 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 35,085 psi | 73% | 2602 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 37,637 psi | 79% | 2579 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 33,750 psi | 71% | 2592 fps | 96.3% |
| Hodgdon H335 | <<locked>> | 80% | 34,432 psi | 72% | 2608 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,004 psi | 50% | 1585 fps | 100% |
| IMR 3031 | 23 gr | 82% | 28,485 psi | 60% | 2503 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 36,927 psi | 77% | 2602 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 40,001 psi | 84% | 2707 fps | 95.5% |
| Lovex D073.6 | 27 gr | 90% | 36,042 psi | 75% | 2674 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 40,118 psi | 84% | 2690 fps | 99.9% |
| Norma 202 | <<locked>> | 86% | 33,098 psi | 69% | 2579 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,149 psi | 50% | 1627 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 38,493 psi | 80% | 2674 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 84% | 34,795 psi | 73% | 2579 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 36,042 psi | 75% | 2674 fps | 95.2% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 37,739 psi | 79% | 2677 fps | 96.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 35,781 psi | 75% | 2608 fps | 97.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 33,605 psi | 70% | 2500 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 30,676 psi | 64% | 2448 fps | 95.2% |
| Somchem S335 | <<locked>> | 82% | 30,748 psi | 64% | 2451 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 33,779 psi | 71% | 2516 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 80% | 29,370 psi | 61% | 2418 fps | 96.4% |
| Vihtavuori N135 | <<locked>> | 82% | 25,976 psi | 54% | 2402 fps | 95.2% |
| Vihtavuori N140 | <<locked>> | 88% | 33,373 psi | 70% | 2562 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 90% | 34,098 psi | 71% | 2592 fps | 95.1% |
| Winchester 748 | <<locked>> | 90% | 39,639 psi | 83% | 2753 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 35 powders for 6 x 52 R Bretschneider loaded with the .243 | 80gr | Sierra SP SSPistol. IMR 3031 delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,778 fps to 2,835 fps. Accurate 4064 gives the best case fill at 100 %, and 35 of the 35 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, 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, Lovex D073.6 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 80gr | Sierra SP SSPistol 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.