Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 62gr | Berger M bullet and 24 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 1680 | <<locked>> | 82% | 43,134 psi | 90% | 3005 fps | 98.8% |
| Accurate 2015 | <<locked>> | 96% | 42,786 psi | 89% | 3081 fps | 98% |
| Accurate 2495ᴾ | <<locked>> | 100% | 36,695 psi | 77% | 3018 fps | 97% |
| Accurate LT-30 | <<locked>> | 86% | 41,582 psi | 87% | 2963 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 86% | 42,975 psi | 90% | 3087 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 41,350 psi | 86% | 3087 fps | 95.9% |
| Alliant AR-Comp | <<locked>> | 98% | 42,119 psi | 88% | 3163 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 90% | 40,843 psi | 85% | 3068 fps | 98.6% |
| Alliant Reloder-7 | <<locked>> | 84% | 42,206 psi | 88% | 3035 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 42,598 psi | 89% | 2992 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 92% | 42,670 psi | 89% | 3120 fps | 96.3% |
| Hodgdon H4198 | <<locked>> | 84% | 43,105 psi | 90% | 3012 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,459 psi | 66% | 2018 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 42,409 psi | 89% | 3176 fps | 97.1% |
| IMR 4198 | <<locked>> | 90% | 42,714 psi | 89% | 3068 fps | 99.4% |
| Norma 200 | <<locked>> | 86% | 41,046 psi | 86% | 3058 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,227 psi | 65% | 2064 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 41,408 psi | 87% | 2808 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 41,858 psi | 87% | 3077 fps | 97% |
| Somchem S335 | <<locked>> | 98% | 42,931 psi | 90% | 3041 fps | 96.2% |
| Vihtavuori N120 | <<locked>> | 86% | 43,134 psi | 90% | 3045 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 41,684 psi | 87% | 3015 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 96% | 41,118 psi | 86% | 3009 fps | 97.5% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 38,305 psi | 80% | 3038 fps | 97.2% |
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 1680 | <<locked>> | 80% | 40,480 psi | 85% | 2949 fps | 98.4% |
| Accurate 2015 | <<locked>> | 88% | 33,228 psi | 69% | 2858 fps | 95.2% |
| Accurate 2495 | <<locked>> | 96% | 31,850 psi | 67% | 2897 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 84% | 39,059 psi | 82% | 2904 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 35,520 psi | 74% | 2927 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 86% | 38,754 psi | 81% | 3028 fps | 95% |
| Alliant AR-Comp | 25.2 gr | 86% | 28,761 psi | 60% | 2805 fps | 96% |
| Alliant Reloder-10x | 22.8 gr | 80% | 29,573 psi | 62% | 2779 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 37,159 psi | 78% | 2920 fps | 98.1% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 37,405 psi | 78% | 2877 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 90% | 40,016 psi | 84% | 3058 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 82% | 40,408 psi | 84% | 2953 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,221 psi | 49% | 1811 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 37,623 psi | 79% | 3064 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 31,836 psi | 67% | 2799 fps | 96.9% |
| Norma 200 | <<locked>> | 80% | 33,779 psi | 71% | 2881 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,814 psi | 48% | 1847 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 39,189 psi | 82% | 2766 fps | 100% |
| SNPE Vectan SP 3 | 24.6 gr | 86% | 36,680 psi | 77% | 2956 fps | 95.4% |
| Somchem S335 | <<locked>> | 96% | 40,335 psi | 84% | 2986 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 35,679 psi | 75% | 2890 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 30,777 psi | 64% | 2749 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 90% | 34,243 psi | 72% | 2848 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 96% | 33,910 psi | 71% | 2930 fps | 95.7% |
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 24 powders for 6 x 52 R Bretschneider loaded with the .243 | 62gr | Berger M. IMR 3031 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,176 fps. Accurate 2495 gives the best case fill at 100 %, and 24 of the 24 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 62.0 gr projectile in 0.243" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, IMR 3031 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 | 62gr | 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.