Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 65gr | Berger ND bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, SNPE Vectan SP 3 and Alliant Reloder-10x.
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>> | 96% | 43,062 psi | 90% | 3018 fps | 98.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 37,231 psi | 78% | 2966 fps | 97.5% |
| Accurate LT-30 | <<locked>> | 86% | 41,959 psi | 88% | 2900 fps | 96.6% |
| ADI AR 2207 | <<locked>> | 84% | 40,930 psi | 86% | 2972 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 41,959 psi | 88% | 3035 fps | 96.4% |
| Alliant AR-Comp | <<locked>> | 98% | 42,453 psi | 89% | 3104 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 90% | 41,307 psi | 86% | 3009 fps | 98.9% |
| Alliant Reloder-7 | <<locked>> | 84% | 42,583 psi | 89% | 2969 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 42,888 psi | 90% | 2933 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 90% | 40,596 psi | 85% | 3005 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,763 psi | 66% | 1965 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 43,265 psi | 90% | 3127 fps | 97.7% |
| IMR 4198 | <<locked>> | 88% | 40,683 psi | 85% | 2953 fps | 99.3% |
| Norma 200 | <<locked>> | 86% | 41,539 psi | 87% | 2995 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,575 psi | 66% | 2011 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 41,742 psi | 87% | 2740 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 42,366 psi | 89% | 3018 fps | 97.5% |
| Somchem S335 | <<locked>> | 98% | 43,279 psi | 90% | 2982 fps | 96.6% |
| Vihtavuori N120 | <<locked>> | 84% | 41,089 psi | 86% | 2930 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 42,221 psi | 88% | 2959 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 96% | 41,321 psi | 86% | 2946 fps | 97.8% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 39,117 psi | 82% | 2992 fps | 97.7% |
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>> | 88% | 33,620 psi | 70% | 2805 fps | 95.8% |
| Accurate 2495 | <<locked>> | 94% | 30,298 psi | 63% | 2792 fps | 95% |
| Accurate LT-30 | <<locked>> | 82% | 36,854 psi | 77% | 2789 fps | 95.1% |
| ADI AR 2207 | <<locked>> | 80% | 36,071 psi | 75% | 2867 fps | 99.9% |
| ADI AR 2219 | <<locked>> | 86% | 38,841 psi | 81% | 2963 fps | 95.5% |
| Alliant AR-Comp | 24 gr | 84% | 27,209 psi | 57% | 2690 fps | 95.6% |
| Alliant Reloder-10x | 22.3 gr | 80% | 30,095 psi | 63% | 2730 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 37,695 psi | 79% | 2864 fps | 98.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 35,317 psi | 74% | 2766 fps | 95% |
| Hodgdon H322 | <<locked>> | 88% | 38,058 psi | 80% | 2943 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,308 psi | 49% | 1759 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 35,433 psi | 74% | 2940 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 32,227 psi | 67% | 2743 fps | 97.4% |
| Norma 200 | <<locked>> | 80% | 34,040 psi | 71% | 2822 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,916 psi | 48% | 1795 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 39,436 psi | 82% | 2697 fps | 100% |
| SNPE Vectan SP 3 | 23.5 gr | 84% | 34,998 psi | 73% | 2844 fps | 95.2% |
| Somchem S335 | <<locked>> | 94% | 38,493 psi | 80% | 2881 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 36,230 psi | 76% | 2831 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 29,283 psi | 61% | 2644 fps | 95% |
| Vihtavuori N133 | <<locked>> | 88% | 32,474 psi | 68% | 2736 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 94% | 32,256 psi | 67% | 2822 fps | 95.4% |
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 52 powders for 6 x 52 R Bretschneider loaded with the .243 | 65gr | Berger ND. IMR 3031 delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,127 fps. Accurate 2495 gives the best case fill at 100 %, and 52 of the 52 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 65.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Hodgdon TrailBoss 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, SNPE Vectan SP 3, Alliant Reloder-10x rank at the top here: for 6 x 52 R Bretschneider with the .243 | 65gr | Berger ND they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2520, Accurate 4064, Accurate LT-32 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.