Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 68gr | Berger M 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% | 42,337 psi | 88% | 2946 fps | 98.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,117 psi | 82% | 2953 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 86% | 43,236 psi | 90% | 2874 fps | 97.5% |
| ADI AR 2207 | <<locked>> | 84% | 42,409 psi | 89% | 2940 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 40,248 psi | 84% | 2943 fps | 96.5% |
| Alliant AR-Comp | <<locked>> | 96% | 41,742 psi | 87% | 3028 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 90% | 42,888 psi | 90% | 2982 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,205 psi | 86% | 2884 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,655 psi | 87% | 2854 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 90% | 42,076 psi | 88% | 2982 fps | 97% |
| Hodgdon H335 | <<locked>> | 90% | 42,743 psi | 89% | 2992 fps | 96.1% |
| Hodgdon H4198 | <<locked>> | 82% | 41,872 psi | 87% | 2864 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,053 psi | 67% | 1926 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 42,061 psi | 88% | 3048 fps | 97.9% |
| IMR 4198 | <<locked>> | 88% | 42,003 psi | 88% | 2920 fps | 99.7% |
| Norma 200 | <<locked>> | 86% | 43,120 psi | 90% | 2966 fps | 99.7% |
| Norma 202 | <<locked>> | 98% | 42,931 psi | 90% | 2999 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,908 psi | 67% | 1972 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,902 psi | 90% | 2697 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 41,060 psi | 86% | 2933 fps | 97.6% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,914 psi | 83% | 2848 fps | 96.4% |
| Somchem S335 | <<locked>> | 96% | 42,496 psi | 89% | 2913 fps | 97% |
| Vihtavuori N120 | <<locked>> | 84% | 42,554 psi | 89% | 2897 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,379 psi | 86% | 2887 fps | 99% |
| Vihtavuori N133 | <<locked>> | 96% | 42,830 psi | 89% | 2920 fps | 98.5% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,770 psi | 85% | 2972 fps | 98.5% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 43,207 psi | 90% | 2972 fps | 96.6% |
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% | 30,545 psi | 64% | 2671 fps | 95.1% |
| Accurate 2495 | <<locked>> | 92% | 29,689 psi | 62% | 2720 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 35,926 psi | 75% | 2713 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 37,405 psi | 78% | 2838 fps | 100% |
| ADI AR 2219 | <<locked>> | 84% | 37,681 psi | 79% | 2884 fps | 95.7% |
| Alliant AR-Comp | 23.4 gr | 82% | 26,440 psi | 55% | 2618 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,270 psi | 65% | 2710 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,972 psi | 81% | 2838 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 33,939 psi | 71% | 2680 fps | 95.1% |
| Hodgdon H322 | 25.4 gr | 86% | 36,854 psi | 77% | 2864 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 88% | 40,001 psi | 84% | 2933 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 39,639 psi | 83% | 2815 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,540 psi | 49% | 1722 fps | 100% |
| IMR 3031 | 26.3 gr | 92% | 34,838 psi | 73% | 2874 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 33,257 psi | 69% | 2720 fps | 98.2% |
| Norma 200 | <<locked>> | 80% | 35,360 psi | 74% | 2799 fps | 98.6% |
| Norma 202 | <<locked>> | 96% | 40,190 psi | 84% | 2940 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,177 psi | 48% | 1759 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,538 psi | 85% | 2657 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 33,895 psi | 71% | 2762 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 37,362 psi | 78% | 2792 fps | 95.6% |
| Somchem S335 | <<locked>> | 92% | 37,376 psi | 78% | 2802 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 37,550 psi | 78% | 2799 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,342 psi | 63% | 2625 fps | 96% |
| Vihtavuori N133 | <<locked>> | 86% | 31,459 psi | 66% | 2661 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 92% | 31,430 psi | 66% | 2746 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 96% | 38,392 psi | 80% | 2867 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 27 powders for 6 x 52 R Bretschneider loaded with the .243 | 68gr | Berger M. IMR 3031 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,048 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 67–90 %, 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 M 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.