Load Specifications
Load data in caliber 6 x 52 R Bretschneider with .243 | 70gr | Sierra MatchKing bullet and 31 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp 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>> | 92% | 41,017 psi | 86% | 2887 fps | 98.6% |
| Accurate 2460 | <<locked>> | 90% | 42,018 psi | 88% | 2920 fps | 96.1% |
| Accurate 2495ᴾ | <<locked>> | 100% | 40,785 psi | 85% | 2949 fps | 98.9% |
| Accurate 4064ᴾ | <<locked>> | 100% | 37,913 psi | 79% | 2904 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 84% | 41,727 psi | 87% | 2812 fps | 97.5% |
| ADI AR 2207 | <<locked>> | 82% | 41,075 psi | 86% | 2877 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 41,684 psi | 87% | 2943 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 96% | 42,801 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 41,582 psi | 87% | 2920 fps | 99.4% |
| Alliant Reloder-7 | <<locked>> | 82% | 42,583 psi | 89% | 2877 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 42,438 psi | 89% | 2841 fps | 98% |
| Hodgdon H322 | <<locked>> | 90% | 43,091 psi | 90% | 2969 fps | 97.6% |
| Hodgdon H335 | <<locked>> | 88% | 41,394 psi | 86% | 2933 fps | 96.2% |
| Hodgdon H4198 | <<locked>> | 82% | 43,178 psi | 90% | 2861 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,995 psi | 67% | 1900 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 40,785 psi | 85% | 2989 fps | 98% |
| IMR 4198 | <<locked>> | 86% | 40,625 psi | 85% | 2861 fps | 99.7% |
| Norma 200 | <<locked>> | 84% | 41,394 psi | 86% | 2897 fps | 99.7% |
| Norma 202 | <<locked>> | 96% | 41,640 psi | 87% | 2940 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,879 psi | 67% | 1942 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 43,279 psi | 90% | 2936 fps | 96.4% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 42,148 psi | 88% | 2940 fps | 96.2% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 42,525 psi | 89% | 2930 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 42,119 psi | 88% | 2851 fps | 96.2% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 40,756 psi | 85% | 2835 fps | 97% |
| Somchem S335 | <<locked>> | 94% | 41,205 psi | 86% | 2854 fps | 97% |
| Vihtavuori N120 | <<locked>> | 82% | 41,191 psi | 86% | 2835 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 42,337 psi | 88% | 2871 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 94% | 41,437 psi | 87% | 2861 fps | 98.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 41,829 psi | 87% | 2959 fps | 99% |
| Vihtavuori N140 | <<locked>> | 98% | 41,887 psi | 88% | 2913 fps | 96.7% |
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>> | 82% | 29,646 psi | 62% | 2615 fps | 95.2% |
| Accurate 2460 | <<locked>> | 88% | 39,407 psi | 82% | 2864 fps | 95.3% |
| Accurate 2495 | <<locked>> | 90% | 28,993 psi | 61% | 2671 fps | 95.5% |
| Accurate 4064 | <<locked>> | 98% | 35,418 psi | 74% | 2844 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 36,666 psi | 77% | 2700 fps | 96.1% |
| ADI AR 2207 | <<locked>> | 80% | 38,334 psi | 80% | 2822 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 36,506 psi | 76% | 2825 fps | 95.7% |
| Alliant AR-Comp | 23 gr | 80% | 25,657 psi | 54% | 2562 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 32,111 psi | 67% | 2700 fps | 97.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 39,929 psi | 83% | 2825 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,998 psi | 73% | 2677 fps | 95.9% |
| Hodgdon H322 | 25 gr | 84% | 35,723 psi | 75% | 2805 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 86% | 38,392 psi | 80% | 2864 fps | 95.2% |
| Hodgdon H4198 | <<locked>> | 80% | 40,422 psi | 84% | 2802 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,540 psi | 49% | 1699 fps | 100% |
| IMR 3031 | 25.9 gr | 90% | 33,837 psi | 71% | 2818 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 33,968 psi | 71% | 2707 fps | 98.6% |
| Norma 200 | <<locked>> | 80% | 36,680 psi | 77% | 2795 fps | 99.1% |
| Norma 202 | <<locked>> | 94% | 38,986 psi | 81% | 2881 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,583 psi | 49% | 1745 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 40,611 psi | 85% | 2877 fps | 95.6% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 39,523 psi | 83% | 2884 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 32,837 psi | 69% | 2703 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 39,900 psi | 83% | 2805 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 36,129 psi | 75% | 2733 fps | 95.6% |
| Somchem S335 | <<locked>> | 90% | 36,318 psi | 76% | 2746 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 38,493 psi | 80% | 2782 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 31,125 psi | 65% | 2615 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 84% | 30,530 psi | 64% | 2605 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 88% | 28,848 psi | 60% | 2641 fps | 95% |
| Vihtavuori N140 | <<locked>> | 94% | 37,202 psi | 78% | 2812 fps | 95.3% |
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 31 powders for 6 x 52 R Bretschneider loaded with the .243 | 70gr | Sierra MatchKing. Alliant AR-Comp delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,015 fps. Accurate 2495 gives the best case fill at 100 %, and 31 of the 31 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 70.0 gr projectile in 0.243" calls for a 1:12.0 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. IMR 3031, Alliant AR-Comp, Hodgdon H322 rank at the top here: for 6 x 52 R Bretschneider with the .243 | 70gr | Sierra MatchKing 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.