Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 68gr | Berger ND bullet and 27 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, IMR 3031 and Hodgdon H322.
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>> | 94% | 42,032 psi | 88% | 2940 fps | 98.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,276 psi | 82% | 2953 fps | 98.4% |
| Accurate LT-30 | <<locked>> | 86% | 42,946 psi | 90% | 2867 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 84% | 42,583 psi | 89% | 2943 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 43,207 psi | 90% | 3005 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 96% | 41,423 psi | 87% | 3022 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 90% | 42,598 psi | 89% | 2976 fps | 99.3% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,336 psi | 86% | 2887 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,394 psi | 86% | 2848 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 90% | 41,800 psi | 87% | 2976 fps | 96.9% |
| Hodgdon H335 | <<locked>> | 90% | 42,873 psi | 90% | 2992 fps | 96.1% |
| Hodgdon H4198 | <<locked>> | 82% | 42,018 psi | 88% | 2867 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,662 psi | 66% | 1916 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 41,800 psi | 87% | 3041 fps | 97.8% |
| IMR 4198 | <<locked>> | 88% | 42,148 psi | 88% | 2923 fps | 99.7% |
| Norma 200 | <<locked>> | 86% | 42,772 psi | 89% | 2959 fps | 99.7% |
| Norma 202 | <<locked>> | 98% | 42,670 psi | 89% | 2992 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,531 psi | 66% | 1962 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,540 psi | 89% | 2690 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 40,756 psi | 85% | 2927 fps | 97.5% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,668 psi | 83% | 2841 fps | 96.3% |
| Somchem S335 | <<locked>> | 96% | 42,235 psi | 88% | 2907 fps | 96.9% |
| Vihtavuori N120 | <<locked>> | 84% | 42,714 psi | 89% | 2897 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,089 psi | 86% | 2877 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 96% | 42,989 psi | 90% | 2923 fps | 98.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,408 psi | 84% | 2963 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 98% | 40,654 psi | 85% | 2917 fps | 95.9% |
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>> | 84% | 30,632 psi | 64% | 2671 fps | 95.2% |
| Accurate 2495 | <<locked>> | 92% | 29,457 psi | 62% | 2713 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 35,650 psi | 74% | 2707 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 37,521 psi | 78% | 2841 fps | 100% |
| ADI AR 2219 | <<locked>> | 84% | 37,840 psi | 79% | 2887 fps | 95.7% |
| Alliant AR-Comp | 23.4 gr | 82% | 26,542 psi | 55% | 2621 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,372 psi | 66% | 2713 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,725 psi | 81% | 2831 fps | 99% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,069 psi | 71% | 2684 fps | 95.1% |
| Hodgdon H322 | 25.3 gr | 86% | 36,593 psi | 76% | 2854 fps | 95.3% |
| Hodgdon H335 | <<locked>> | 88% | 39,755 psi | 83% | 2927 fps | 95.2% |
| Hodgdon H4198 | <<locked>> | 80% | 39,349 psi | 82% | 2808 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,612 psi | 49% | 1726 fps | 100% |
| IMR 3031 | 26.2 gr | 92% | 34,592 psi | 72% | 2864 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 33,315 psi | 70% | 2720 fps | 98.2% |
| Norma 200 | <<locked>> | 80% | 35,476 psi | 74% | 2802 fps | 98.6% |
| Norma 202 | <<locked>> | 96% | 40,393 psi | 84% | 2943 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,235 psi | 49% | 1759 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,669 psi | 85% | 2657 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 34,040 psi | 71% | 2766 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 37,130 psi | 78% | 2785 fps | 95.5% |
| Somchem S335 | <<locked>> | 92% | 37,115 psi | 78% | 2795 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 37,681 psi | 79% | 2802 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,124 psi | 63% | 2615 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 86% | 31,589 psi | 66% | 2661 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 92% | 31,546 psi | 66% | 2749 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 96% | 38,087 psi | 80% | 2861 fps | 95.1% |
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 27 powders for 6 x 52 R Bretschneider loaded with the .243 | 68gr | Berger ND. IMR 3031 delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,041 fps. Accurate 2495 gives the best case fill at 100 %, and 27 of the 27 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 68.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, 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. Alliant AR-Comp, IMR 3031, Hodgdon H322 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 68gr | Berger ND 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.