Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 75gr | Barnes BND SPIT-FIRE bullet and 33 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% | 42,134 psi | 88% | 2789 fps | 98.9% |
| Accurate 2460 | <<locked>> | 92% | 43,250 psi | 90% | 2822 fps | 96.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 38,566 psi | 81% | 2789 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 86% | 42,815 psi | 89% | 2710 fps | 97.8% |
| Accurate LT-32 | <<locked>> | 86% | 43,236 psi | 90% | 2713 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 84% | 42,583 psi | 89% | 2779 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 42,902 psi | 90% | 2841 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 96% | 41,350 psi | 86% | 2864 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 90% | 42,714 psi | 89% | 2818 fps | 99.6% |
| Alliant Reloder-7 | <<locked>> | 82% | 41,452 psi | 87% | 2730 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 41,263 psi | 86% | 2697 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 90% | 41,901 psi | 88% | 2822 fps | 97.4% |
| Hodgdon H335 | <<locked>> | 90% | 42,627 psi | 89% | 2835 fps | 96.6% |
| Hodgdon H4198 | <<locked>> | 82% | 42,047 psi | 88% | 2710 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,879 psi | 67% | 1795 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 41,858 psi | 87% | 2884 fps | 98.3% |
| IMR 4198 | <<locked>> | 88% | 42,206 psi | 88% | 2766 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 42,830 psi | 89% | 2802 fps | 99.8% |
| Norma 202 | <<locked>> | 98% | 42,366 psi | 89% | 2831 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,821 psi | 66% | 1837 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 41,553 psi | 87% | 2779 fps | 96% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,902 psi | 90% | 2536 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 40,654 psi | 85% | 2789 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 40,683 psi | 85% | 2769 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 40,915 psi | 85% | 2703 fps | 95.9% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,233 psi | 82% | 2684 fps | 96.7% |
| Somchem S335 | <<locked>> | 96% | 42,177 psi | 88% | 2756 fps | 97.3% |
| Vihtavuori N120 | <<locked>> | 84% | 42,714 psi | 89% | 2736 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 41,205 psi | 86% | 2726 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 96% | 42,714 psi | 89% | 2766 fps | 98.8% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 40,016 psi | 84% | 2802 fps | 98.7% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 42,888 psi | 90% | 2812 fps | 97% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 41,466 psi | 87% | 2799 fps | 96.1% |
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% | 30,777 psi | 64% | 2536 fps | 95.9% |
| Accurate 2460 | <<locked>> | 90% | 40,248 psi | 84% | 2762 fps | 95.7% |
| Accurate 2495 | <<locked>> | 90% | 27,688 psi | 58% | 2530 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 35,955 psi | 75% | 2566 fps | 95.9% |
| Accurate LT-32 | <<locked>> | 84% | 40,843 psi | 85% | 2667 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 37,159 psi | 78% | 2677 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 35,099 psi | 73% | 2671 fps | 95.3% |
| Alliant AR-Comp | 21.2 gr | 80% | 25,048 psi | 52% | 2434 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,140 psi | 65% | 2562 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 39,044 psi | 82% | 2684 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 33,823 psi | 71% | 2536 fps | 95.6% |
| Hodgdon H322 | 22.9 gr | 84% | 34,229 psi | 72% | 2648 fps | 95% |
| Hodgdon H335 | <<locked>> | 88% | 39,784 psi | 83% | 2776 fps | 95.7% |
| Hodgdon H4198 | <<locked>> | 80% | 39,668 psi | 83% | 2661 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,627 psi | 49% | 1608 fps | 100% |
| IMR 3031 | 23.8 gr | 90% | 32,648 psi | 68% | 2667 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 33,214 psi | 69% | 2569 fps | 98.6% |
| Norma 200 | <<locked>> | 80% | 35,418 psi | 74% | 2651 fps | 98.9% |
| Norma 202 | <<locked>> | 94% | 37,652 psi | 79% | 2733 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,293 psi | 49% | 1644 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 39,276 psi | 82% | 2730 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,379 psi | 84% | 2497 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 37,942 psi | 79% | 2730 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 31,937 psi | 67% | 2566 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 38,595 psi | 81% | 2657 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 34,853 psi | 73% | 2589 fps | 95.2% |
| Somchem S335 | <<locked>> | 90% | 35,128 psi | 73% | 2605 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 37,333 psi | 78% | 2638 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 30,269 psi | 63% | 2480 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 29,631 psi | 62% | 2470 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 90% | 29,573 psi | 62% | 2556 fps | 95.5% |
| Vihtavuori N140 | <<locked>> | 96% | 38,189 psi | 80% | 2717 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 98% | 39,146 psi | 82% | 2749 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 33 powders for 6 x 52 R Bretschneider loaded with the .243 | 75gr | Barnes BND SPIT-FIRE. IMR 3031 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,795 fps to 2,884 fps. Accurate 2495 gives the best case fill at 100 %, and 33 of the 33 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 75.0 gr projectile in 0.243" calls for a 1:9.0 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 | 75gr | Barnes BND SPIT-FIRE 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.