Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 85gr | Nosler Partition bullet and 38 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 Vihtavuori N135.
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% | 43,091 psi | 90% | 2664 fps | 99.8% |
| Accurate 2460 | <<locked>> | 86% | 41,394 psi | 86% | 2651 fps | 97.7% |
| Accurate 2495 | <<locked>> | 96% | 40,857 psi | 85% | 2687 fps | 99.8% |
| Accurate 2520 | <<locked>> | 90% | 41,553 psi | 87% | 2694 fps | 97.4% |
| Accurate 4064 | <<locked>> | 98% | 40,422 psi | 84% | 2700 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 82% | 42,844 psi | 90% | 2582 fps | 99.1% |
| Accurate LT-32 | <<locked>> | 82% | 43,236 psi | 90% | 2589 fps | 97.6% |
| ADI AR 2219 | <<locked>> | 82% | 40,640 psi | 85% | 2664 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 92% | 42,279 psi | 88% | 2733 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 40,654 psi | 85% | 2631 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 41,162 psi | 86% | 2566 fps | 99% |
| Hodgdon Benchmark | <<locked>> | 88% | 42,134 psi | 88% | 2618 fps | 96.2% |
| Hodgdon BL-C2 | <<locked>> | 92% | 42,395 psi | 89% | 2730 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 86% | 42,076 psi | 88% | 2690 fps | 98.9% |
| Hodgdon H335 | <<locked>> | 86% | 42,859 psi | 90% | 2707 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,721 psi | 68% | 1713 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 42,801 psi | 89% | 2766 fps | 99.6% |
| IMR 4198 | <<locked>> | 84% | 42,090 psi | 88% | 2618 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 40,944 psi | 86% | 2641 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 94% | 42,163 psi | 88% | 2720 fps | 97.6% |
| Norma 202 | <<locked>> | 92% | 40,886 psi | 85% | 2667 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,793 psi | 69% | 1752 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 41,829 psi | 87% | 2661 fps | 97% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 42,090 psi | 88% | 2772 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 90% | 42,467 psi | 89% | 2664 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 94% | 42,163 psi | 88% | 2720 fps | 97.6% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 41,031 psi | 86% | 2661 fps | 97.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 41,553 psi | 87% | 2644 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 41,307 psi | 86% | 2585 fps | 97.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 42,424 psi | 89% | 2621 fps | 98.9% |
| Somchem S321 | <<locked>> | 88% | 42,308 psi | 88% | 2690 fps | 96% |
| Somchem S335 | <<locked>> | 92% | 42,844 psi | 90% | 2635 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 86% | 41,336 psi | 86% | 2589 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 92% | 43,308 psi | 90% | 2638 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 96% | 41,756 psi | 87% | 2694 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 94% | 41,147 psi | 86% | 2648 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 96% | 42,612 psi | 89% | 2690 fps | 98.1% |
| Winchester 748 | <<locked>> | 90% | 40,538 psi | 85% | 2694 fps | 96.2% |
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% | 31,517 psi | 66% | 2421 fps | 97.8% |
| Accurate 2460 | <<locked>> | 80% | 33,678 psi | 70% | 2490 fps | 95.5% |
| Accurate 2495 | <<locked>> | 80% | 24,004 psi | 50% | 2287 fps | 95.2% |
| Accurate 2520 | 25.1 gr | 84% | 33,649 psi | 70% | 2530 fps | 95% |
| Accurate 4064 | <<locked>> | 90% | 31,270 psi | 65% | 2500 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 40,030 psi | 84% | 2530 fps | 98.6% |
| Accurate LT-32 | <<locked>> | 80% | 40,408 psi | 84% | 2536 fps | 97% |
| ADI AR 2219 | <<locked>> | 80% | 37,869 psi | 79% | 2605 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 28,674 psi | 60% | 2431 fps | 99.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,201 psi | 76% | 2543 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 38,580 psi | 81% | 2516 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 39,885 psi | 83% | 2575 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 90% | 39,189 psi | 82% | 2664 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 34,534 psi | 72% | 2530 fps | 97.1% |
| Hodgdon H335 | <<locked>> | 80% | 34,998 psi | 73% | 2543 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,163 psi | 50% | 1529 fps | 100% |
| IMR 3031 | 21.9 gr | 80% | 27,514 psi | 57% | 2402 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 37,463 psi | 78% | 2530 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 38,261 psi | 80% | 2589 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 88% | 34,505 psi | 72% | 2559 fps | 95.3% |
| Norma 202 | <<locked>> | 84% | 31,792 psi | 66% | 2467 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,352 psi | 51% | 1572 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 36,970 psi | 77% | 2559 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 39,421 psi | 82% | 2710 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 82% | 33,649 psi | 70% | 2470 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 34,505 psi | 72% | 2559 fps | 95.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 38,406 psi | 80% | 2608 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 36,448 psi | 76% | 2543 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 32,387 psi | 68% | 2395 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 29,341 psi | 61% | 2339 fps | 95.2% |
| Somchem S321 | <<locked>> | 86% | 39,537 psi | 83% | 2635 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 29,718 psi | 62% | 2349 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 34,418 psi | 72% | 2451 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 80% | 29,950 psi | 63% | 2356 fps | 97.2% |
| Vihtavuori N135 | 21.4 gr | 80% | 25,077 psi | 52% | 2300 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 86% | 32,140 psi | 67% | 2454 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 88% | 33,011 psi | 69% | 2490 fps | 95.3% |
| Winchester 748 | <<locked>> | 88% | 37,942 psi | 79% | 2638 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 38 powders for 6 x 52 R Bretschneider loaded with the .243 | 85gr | Nosler Partition. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,772 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,772 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 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 85.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, ReloadSwiss RS 60 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, Vihtavuori N135 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 85gr | Nosler Partition 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.