Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 80gr | Sierra VarmintKing 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, Accurate 2520 and Alliant AR-Comp.
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% | 42,902 psi | 90% | 2733 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 41,524 psi | 87% | 2726 fps | 97.1% |
| Accurate 2495 | <<locked>> | 98% | 40,756 psi | 85% | 2762 fps | 99.5% |
| Accurate 2520 | <<locked>> | 92% | 41,640 psi | 87% | 2769 fps | 96.7% |
| Accurate 4064ᴾ | <<locked>> | 100% | 40,306 psi | 84% | 2772 fps | 97.6% |
| Accurate LT-30 | <<locked>> | 84% | 43,105 psi | 90% | 2654 fps | 98.6% |
| Accurate LT-32 | <<locked>> | 82% | 41,104 psi | 86% | 2615 fps | 96.4% |
| ADI AR 2207 | <<locked>> | 82% | 42,859 psi | 90% | 2707 fps | 100% |
| ADI AR 2219 | <<locked>> | 84% | 41,002 psi | 86% | 2740 fps | 98.1% |
| Alliant AR-Comp | <<locked>> | 94% | 42,511 psi | 89% | 2815 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 41,002 psi | 86% | 2717 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 41,582 psi | 87% | 2644 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 88% | 42,467 psi | 89% | 2769 fps | 98.4% |
| Hodgdon H335 | <<locked>> | 88% | 43,134 psi | 90% | 2782 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,648 psi | 68% | 1762 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 43,033 psi | 90% | 2844 fps | 99.2% |
| IMR 4198 | <<locked>> | 86% | 42,699 psi | 89% | 2703 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 41,510 psi | 87% | 2730 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 96% | 42,206 psi | 88% | 2789 fps | 96.8% |
| Norma 200 | <<locked>> | 82% | 41,249 psi | 86% | 2700 fps | 100% |
| Norma 202 | <<locked>> | 94% | 41,104 psi | 86% | 2743 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,663 psi | 68% | 1804 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 42,192 psi | 88% | 2736 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 92% | 42,772 psi | 89% | 2740 fps | 97.3% |
| Shooters World AR Plus | <<locked>> | 82% | 41,510 psi | 87% | 2730 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 96% | 42,206 psi | 88% | 2789 fps | 96.8% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 41,321 psi | 86% | 2736 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 41,945 psi | 88% | 2726 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 41,843 psi | 87% | 2661 fps | 97.2% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 42,873 psi | 90% | 2697 fps | 98.4% |
| Somchem S335 | <<locked>> | 94% | 43,192 psi | 90% | 2713 fps | 98.4% |
| Vihtavuori N120 | <<locked>> | 82% | 42,931 psi | 90% | 2664 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 41,800 psi | 87% | 2671 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 92% | 41,278 psi | 86% | 2671 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 98% | 41,843 psi | 87% | 2769 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 96% | 41,452 psi | 87% | 2723 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 98% | 42,409 psi | 89% | 2756 fps | 97.4% |
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% | 29,443 psi | 62% | 2438 fps | 96.4% |
| Accurate 2460 | <<locked>> | 84% | 36,129 psi | 75% | 2612 fps | 95.5% |
| Accurate 2495 | <<locked>> | 84% | 25,295 psi | 53% | 2392 fps | 95% |
| Accurate 2520 | 26.1 gr | 88% | 36,114 psi | 75% | 2654 fps | 95% |
| Accurate 4064 | <<locked>> | 94% | 33,344 psi | 70% | 2618 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 38,450 psi | 80% | 2562 fps | 97.7% |
| Accurate LT-32 | <<locked>> | 80% | 38,827 psi | 81% | 2569 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 40,364 psi | 84% | 2664 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 35,665 psi | 75% | 2625 fps | 96.7% |
| Alliant AR-Comp | 21.8 gr | 80% | 27,180 psi | 57% | 2451 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,939 psi | 71% | 2566 fps | 98.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,579 psi | 76% | 2543 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 80% | 32,880 psi | 69% | 2556 fps | 95.7% |
| Hodgdon H335 | <<locked>> | 82% | 35,244 psi | 74% | 2615 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,047 psi | 50% | 1575 fps | 100% |
| IMR 3031 | 22.8 gr | 84% | 29,298 psi | 61% | 2516 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 35,839 psi | 75% | 2566 fps | 99.6% |
| Lovex D073.4 | <<locked>> | 80% | 38,725 psi | 81% | 2674 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 92% | 36,521 psi | 76% | 2674 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 38,537 psi | 81% | 2648 fps | 99.8% |
| Norma 202 | <<locked>> | 88% | 33,794 psi | 71% | 2582 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,786 psi | 50% | 1608 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 39,465 psi | 82% | 2680 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 86% | 35,752 psi | 75% | 2589 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 38,725 psi | 81% | 2674 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 36,521 psi | 76% | 2674 fps | 95.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,100 psi | 75% | 2625 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,650 psi | 72% | 2572 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 34,708 psi | 73% | 2513 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 31,430 psi | 66% | 2451 fps | 95.1% |
| Somchem S335 | <<locked>> | 84% | 31,633 psi | 66% | 2461 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 40,509 psi | 85% | 2621 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,779 psi | 68% | 2480 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 80% | 28,485 psi | 60% | 2382 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 84% | 26,672 psi | 56% | 2411 fps | 95.3% |
| Vihtavuori N140 | <<locked>> | 90% | 34,171 psi | 71% | 2569 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 92% | 35,070 psi | 73% | 2602 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 37 powders for 6 x 52 R Bretschneider loaded with the .243 | 80gr | Sierra VarmintKing. IMR 3031 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,844 fps. Accurate 4064 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 68–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.243" calls for a 1:10.0 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, Accurate 2520, Alliant AR-Comp rank at the top here: for 6 x 52 R Bretschneider with the .243 | 80gr | Sierra VarmintKing 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.