Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 90gr | Barnes X S bullet and 41 powders. The key underlying parameters are shown in the table above.
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>> | 86% | 41,640 psi | 87% | 2520 fps | 99.7% |
| Accurate 2460 | <<locked>> | 84% | 42,511 psi | 89% | 2556 fps | 98.1% |
| Accurate 2495 | <<locked>> | 94% | 43,062 psi | 90% | 2608 fps | 99.9% |
| Accurate 2520 | <<locked>> | 88% | 42,192 psi | 88% | 2595 fps | 97.7% |
| Accurate 4064 | <<locked>> | 96% | 42,583 psi | 89% | 2625 fps | 98.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 42,366 psi | 89% | 2559 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 90% | 42,989 psi | 90% | 2631 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 42,003 psi | 88% | 2539 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 86% | 42,525 psi | 89% | 2516 fps | 96.5% |
| Hodgdon BL-C2 | <<locked>> | 90% | 42,873 psi | 90% | 2628 fps | 96.8% |
| Hodgdon H322 | <<locked>> | 84% | 42,308 psi | 88% | 2582 fps | 99.1% |
| Hodgdon H335 | <<locked>> | 84% | 43,163 psi | 90% | 2602 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,895 psi | 71% | 1650 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 41,176 psi | 86% | 2621 fps | 99.5% |
| IMR 4198 | <<locked>> | 82% | 42,250 psi | 88% | 2507 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 42,366 psi | 89% | 2559 fps | 95.8% |
| Lovex D073.5 | <<locked>> | 84% | 42,148 psi | 88% | 2552 fps | 96.9% |
| Lovex D073.6 | <<locked>> | 90% | 40,466 psi | 85% | 2575 fps | 97.3% |
| Lovex S062 | <<locked>> | 94% | 42,583 psi | 89% | 2579 fps | 96.1% |
| Norma 201 | <<locked>> | 90% | 42,105 psi | 88% | 2552 fps | 95.9% |
| Norma 202 | <<locked>> | 90% | 41,858 psi | 87% | 2575 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,200 psi | 71% | 1690 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 42,351 psi | 88% | 2559 fps | 97.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 42,264 psi | 88% | 2667 fps | 96.8% |
| Rottweil R 901 | <<locked>> | 86% | 41,727 psi | 87% | 2526 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 92% | 42,482 psi | 89% | 2549 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 40,466 psi | 85% | 2575 fps | 97.3% |
| Shooters World Precision | <<locked>> | 94% | 42,583 psi | 89% | 2579 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 41,872 psi | 87% | 2536 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 41,713 psi | 87% | 2484 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 43,047 psi | 90% | 2523 fps | 99.1% |
| Somchem S321 | <<locked>> | 86% | 43,062 psi | 90% | 2595 fps | 96.4% |
| Somchem S335 | <<locked>> | 88% | 41,075 psi | 86% | 2490 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 84% | 41,974 psi | 88% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 41,162 psi | 86% | 2490 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 94% | 42,801 psi | 89% | 2598 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 92% | 41,655 psi | 87% | 2549 fps | 98.5% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 43,265 psi | 90% | 2589 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 88% | 42,656 psi | 89% | 2559 fps | 96% |
| Vihtavuori N540 | <<locked>> | 94% | 43,004 psi | 90% | 2589 fps | 98.3% |
| Winchester 748 | <<locked>> | 88% | 40,640 psi | 85% | 2585 fps | 96.4% |
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 34,766 psi | 73% | 2382 fps | 98.8% |
| Accurate 2460 | <<locked>> | 80% | 37,637 psi | 79% | 2464 fps | 97% |
| Accurate 2495 | <<locked>> | 80% | 28,340 psi | 59% | 2293 fps | 97.4% |
| Accurate 2520 | <<locked>> | 82% | 34,867 psi | 73% | 2444 fps | 95.7% |
| Accurate 4064 | <<locked>> | 84% | 30,284 psi | 63% | 2356 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 40,132 psi | 84% | 2513 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 31,908 psi | 67% | 2405 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,639 psi | 83% | 2497 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 38,189 psi | 80% | 2428 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 86% | 37,594 psi | 79% | 2523 fps | 95.2% |
| Hodgdon H322 | <<locked>> | 80% | 37,724 psi | 79% | 2490 fps | 98.2% |
| Hodgdon H335 | <<locked>> | 80% | 38,159 psi | 80% | 2503 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,382 psi | 53% | 1476 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 30,371 psi | 63% | 2372 fps | 96.8% |
| IMR 4198 | <<locked>> | 80% | 39,914 psi | 83% | 2464 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 40,132 psi | 84% | 2513 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 80% | 36,985 psi | 77% | 2448 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 84% | 33,417 psi | 70% | 2425 fps | 95.1% |
| Lovex S062 | <<locked>> | 92% | 39,871 psi | 83% | 2526 fps | 95.3% |
| Norma 201 | <<locked>> | 88% | 39,900 psi | 83% | 2507 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 31,009 psi | 65% | 2336 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,324 psi | 53% | 1509 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 37,507 psi | 78% | 2461 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 40,001 psi | 84% | 2618 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 35,578 psi | 74% | 2395 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 90% | 40,277 psi | 84% | 2507 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,417 psi | 70% | 2425 fps | 95.1% |
| Shooters World Precision | <<locked>> | 92% | 39,871 psi | 83% | 2526 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 39,494 psi | 83% | 2490 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,330 psi | 70% | 2306 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 28,761 psi | 60% | 2218 fps | 95.2% |
| Somchem S321 | <<locked>> | 84% | 40,350 psi | 84% | 2543 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 32,851 psi | 69% | 2316 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 80% | 37,594 psi | 79% | 2405 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 80% | 32,866 psi | 69% | 2320 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 80% | 28,311 psi | 59% | 2283 fps | 97.2% |
| Vihtavuori N140 | <<locked>> | 82% | 31,328 psi | 65% | 2326 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 96% | 38,334 psi | 80% | 2490 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 86% | 39,856 psi | 83% | 2503 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 84% | 31,749 psi | 66% | 2352 fps | 95.1% |
| Winchester 748 | <<locked>> | 86% | 38,537 psi | 81% | 2539 fps | 95.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 73 powders for 6 x 52 R Bretschneider loaded with the .243 | 90gr | Barnes X S. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,667 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,667 fps. Alliant Reloder-17 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-17, 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. As outliers, ADI AR 2206H, ADI AR 2208, Alliant Power Pro 2000-MR burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.