Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 70gr | Hornady SP SX bullet and 32 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 Accurate 4064.
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>> | 88% | 42,685 psi | 89% | 2982 fps | 99.5% |
| Accurate 2460 | <<locked>> | 84% | 40,625 psi | 85% | 2953 fps | 97% |
| Accurate 2495 | <<locked>> | 94% | 40,901 psi | 85% | 3002 fps | 99.6% |
| Accurate 2520 | <<locked>> | 88% | 41,133 psi | 86% | 3002 fps | 96.7% |
| Accurate 4064 | <<locked>> | 96% | 40,930 psi | 86% | 3025 fps | 97.9% |
| ADI AR 2219 | <<locked>> | 82% | 42,540 psi | 89% | 3028 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 90% | 42,206 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 43,033 psi | 90% | 3012 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 43,192 psi | 90% | 2923 fps | 99% |
| Hodgdon H322 | <<locked>> | 84% | 41,727 psi | 87% | 3012 fps | 98.4% |
| Hodgdon H335 | <<locked>> | 84% | 42,540 psi | 89% | 3022 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,098 psi | 69% | 1988 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,815 psi | 89% | 3097 fps | 99.3% |
| IMR 4198 | <<locked>> | 82% | 41,408 psi | 87% | 2940 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 42,163 psi | 88% | 3035 fps | 97% |
| Norma 202 | <<locked>> | 92% | 43,294 psi | 90% | 3038 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,025 psi | 69% | 2031 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 41,466 psi | 87% | 2976 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 88% | 42,250 psi | 88% | 2982 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 92% | 42,163 psi | 88% | 3035 fps | 97% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 43,134 psi | 90% | 3028 fps | 97.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 40,886 psi | 85% | 2963 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 40,611 psi | 85% | 2890 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 42,206 psi | 88% | 2933 fps | 98.5% |
| Somchem S335 | <<locked>> | 90% | 42,380 psi | 89% | 2946 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 84% | 40,698 psi | 85% | 2900 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 90% | 43,062 psi | 90% | 2956 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 94% | 41,800 psi | 87% | 3015 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 92% | 41,060 psi | 86% | 2963 fps | 97.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 42,598 psi | 89% | 2999 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 94% | 42,250 psi | 88% | 2999 fps | 97.6% |
| Winchester 748 | <<locked>> | 90% | 42,844 psi | 90% | 3064 fps | 96.2% |
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 2015 | <<locked>> | 80% | 32,837 psi | 69% | 2756 fps | 97.6% |
| Accurate 2460 | <<locked>> | 80% | 35,549 psi | 74% | 2835 fps | 95.4% |
| Accurate 2495 | <<locked>> | 82% | 27,282 psi | 57% | 2657 fps | 95.9% |
| Accurate 2520 | <<locked>> | 84% | 35,853 psi | 75% | 2881 fps | 95% |
| Accurate 4064 | 30.3 gr | 90% | 33,663 psi | 70% | 2851 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 39,740 psi | 83% | 2969 fps | 98% |
| Alliant AR-Comp | 26.6 gr | 80% | 30,095 psi | 63% | 2772 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,884 psi | 79% | 2900 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,234 psi | 84% | 2864 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 36,361 psi | 76% | 2887 fps | 97% |
| Hodgdon H335 | <<locked>> | 80% | 36,898 psi | 77% | 2894 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,497 psi | 51% | 1785 fps | 100% |
| IMR 3031 | 27.3 gr | 82% | 30,922 psi | 65% | 2799 fps | 95.9% |
| IMR 4198 | <<locked>> | 80% | 39,044 psi | 82% | 2890 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 88% | 36,753 psi | 77% | 2913 fps | 95.3% |
| Norma 202 | <<locked>> | 86% | 35,752 psi | 75% | 2867 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,540 psi | 51% | 1827 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 38,870 psi | 81% | 2917 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 82% | 35,099 psi | 73% | 2812 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 36,753 psi | 77% | 2913 fps | 95.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,422 psi | 84% | 2969 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,116 psi | 80% | 2900 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 35,795 psi | 75% | 2779 fps | 95.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 30,937 psi | 65% | 2671 fps | 95.1% |
| Somchem S335 | <<locked>> | 82% | 33,040 psi | 69% | 2726 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 35,926 psi | 75% | 2795 fps | 99% |
| Vihtavuori N133 | <<locked>> | 80% | 31,314 psi | 65% | 2687 fps | 97% |
| Vihtavuori N135 | <<locked>> | 80% | 26,353 psi | 55% | 2618 fps | 95.1% |
| Vihtavuori N140 | <<locked>> | 86% | 33,924 psi | 71% | 2795 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 98% | 40,176 psi | 84% | 2943 fps | 95% |
| Vihtavuori N540 | <<locked>> | 88% | 34,679 psi | 72% | 2825 fps | 95.2% |
| Winchester 748 | <<locked>> | 88% | 40,103 psi | 84% | 3002 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 32 powders for 6 x 52 R BB2 loaded with the .243 | 70gr | Hornady SP SX. IMR 3031 delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,097 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 32 of the 32 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N150 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, Accurate 4064 rank at the top here: for 6 x 52 R BB2 with the .243 | 70gr | Hornady SP SX 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.