Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 70gr | Speer TNT bullet and 33 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>> | 92% | 40,828 psi | 85% | 2884 fps | 98.6% |
| Accurate 2460 | <<locked>> | 90% | 42,279 psi | 88% | 2923 fps | 96.2% |
| Accurate 2495ᴾ | <<locked>> | 100% | 41,017 psi | 86% | 2956 fps | 99% |
| Accurate 4064ᴾ | <<locked>> | 100% | 38,203 psi | 80% | 2910 fps | 96% |
| Accurate LT-30 | <<locked>> | 84% | 41,553 psi | 87% | 2812 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 82% | 41,365 psi | 86% | 2884 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 41,901 psi | 88% | 2946 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 96% | 43,033 psi | 90% | 3022 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 41,887 psi | 88% | 2930 fps | 99.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 42,859 psi | 90% | 2884 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 42,714 psi | 89% | 2844 fps | 98% |
| Hodgdon H322 | <<locked>> | 90% | 43,308 psi | 90% | 2979 fps | 97.7% |
| Hodgdon H335 | <<locked>> | 88% | 41,220 psi | 86% | 2930 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,329 psi | 68% | 1906 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 41,031 psi | 86% | 2992 fps | 98% |
| IMR 4198 | <<locked>> | 88% | 43,149 psi | 90% | 2910 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 98% | 42,801 psi | 89% | 2989 fps | 95.8% |
| Norma 200 | <<locked>> | 84% | 41,640 psi | 87% | 2904 fps | 99.7% |
| Norma 202 | <<locked>> | 96% | 41,887 psi | 88% | 2943 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,792 psi | 66% | 1942 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 43,091 psi | 90% | 2933 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 98% | 42,801 psi | 89% | 2989 fps | 95.8% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 42,351 psi | 88% | 2946 fps | 96.3% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 42,351 psi | 88% | 2927 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 42,380 psi | 89% | 2854 fps | 96.3% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 40,944 psi | 86% | 2841 fps | 97.1% |
| Somchem S335 | <<locked>> | 94% | 41,031 psi | 86% | 2851 fps | 97% |
| Vihtavuori N120 | <<locked>> | 82% | 41,524 psi | 87% | 2841 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 42,540 psi | 89% | 2877 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 94% | 41,698 psi | 87% | 2867 fps | 98.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 42,090 psi | 88% | 2966 fps | 99% |
| Vihtavuori N140 | <<locked>> | 98% | 42,061 psi | 88% | 2917 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 98% | 40,872 psi | 85% | 2904 fps | 95.9% |
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 29,863 psi | 62% | 2621 fps | 95.3% |
| Accurate 2460 | <<locked>> | 88% | 39,581 psi | 83% | 2867 fps | 95.4% |
| Accurate 2495 | <<locked>> | 90% | 29,196 psi | 61% | 2674 fps | 95.6% |
| Accurate 4064 | <<locked>> | 98% | 35,665 psi | 75% | 2851 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 36,941 psi | 77% | 2710 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 80% | 38,667 psi | 81% | 2828 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 36,753 psi | 77% | 2831 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 80% | 25,831 psi | 54% | 2569 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 32,343 psi | 68% | 2707 fps | 97.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 40,176 psi | 84% | 2828 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,186 psi | 74% | 2684 fps | 96% |
| Hodgdon H322 | <<locked>> | 84% | 35,520 psi | 74% | 2802 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 86% | 38,624 psi | 81% | 2871 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,467 psi | 49% | 1699 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 33,634 psi | 70% | 2812 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 34,200 psi | 71% | 2710 fps | 98.7% |
| Lovex D073.6 | <<locked>> | 96% | 39,943 psi | 83% | 2927 fps | 95% |
| Norma 200 | <<locked>> | 80% | 36,521 psi | 76% | 2792 fps | 99.1% |
| Norma 202 | <<locked>> | 94% | 39,218 psi | 82% | 2887 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,511 psi | 49% | 1742 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 40,857 psi | 85% | 2887 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 96% | 39,943 psi | 83% | 2927 fps | 95% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 39,755 psi | 83% | 2890 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 33,054 psi | 69% | 2710 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 40,132 psi | 84% | 2812 fps | 95.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 36,347 psi | 76% | 2740 fps | 95.7% |
| Somchem S335 | <<locked>> | 90% | 36,492 psi | 76% | 2753 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 38,754 psi | 81% | 2789 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 31,372 psi | 66% | 2621 fps | 96.9% |
| Vihtavuori N133 | <<locked>> | 84% | 30,705 psi | 64% | 2612 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 90% | 30,734 psi | 64% | 2697 fps | 95.9% |
| Vihtavuori N140 | <<locked>> | 94% | 37,028 psi | 77% | 2808 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 96% | 38,363 psi | 80% | 2851 fps | 95.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 65 powders for 6 x 52 R Bretschneider loaded with the .243 | 70gr | Speer TNT. Alliant AR-Comp delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,022 fps. Accurate 2495 gives the best case fill at 100 %, and 65 of the 65 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 70.0 gr projectile in 0.243" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Alliant Reloder- TS 15.5 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 Benchmark 8208, Alliant Power Pro 1200-R 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.