Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 80gr | Frontier BTSP bullet and 44 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, IMR 3031 and Hodgdon BL-C2.
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>> | 86% | 41,872 psi | 87% | 2776 fps | 99.8% |
| Accurate 2460 | <<locked>> | 84% | 43,091 psi | 90% | 2825 fps | 98.5% |
| Accurate 2495 | <<locked>> | 92% | 40,944 psi | 86% | 2818 fps | 99.9% |
| Accurate 2520 | <<locked>> | 86% | 40,698 psi | 85% | 2815 fps | 97.7% |
| Accurate 4064 | <<locked>> | 96% | 43,265 psi | 90% | 2887 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 40,741 psi | 85% | 2779 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 88% | 41,698 psi | 87% | 2861 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 43,120 psi | 90% | 2877 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 82% | 42,105 psi | 88% | 2799 fps | 100% |
| Bofors RP3 | <<locked>> | 96% | 42,511 psi | 89% | 2874 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 40,973 psi | 86% | 2740 fps | 96.5% |
| Hodgdon BL-C2 | <<locked>> | 88% | 41,452 psi | 87% | 2848 fps | 96.7% |
| Hodgdon H322 | <<locked>> | 82% | 40,828 psi | 85% | 2805 fps | 99% |
| Hodgdon H335 | <<locked>> | 82% | 41,684 psi | 87% | 2822 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 42,134 psi | 88% | 2884 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,533 psi | 70% | 1844 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 42,438 psi | 89% | 2900 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 40,741 psi | 85% | 2779 fps | 95.7% |
| Lovex D073.5 | <<locked>> | 84% | 42,815 psi | 89% | 2818 fps | 97.4% |
| Lovex D073.6 | <<locked>> | 90% | 41,481 psi | 87% | 2841 fps | 97.8% |
| Lovex S062 | <<locked>> | 94% | 43,308 psi | 90% | 2848 fps | 96.6% |
| Norma 201 | <<locked>> | 90% | 42,815 psi | 89% | 2822 fps | 96.4% |
| Norma 202 | <<locked>> | 90% | 42,946 psi | 90% | 2848 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,562 psi | 70% | 1886 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 43,207 psi | 90% | 2831 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 40,901 psi | 85% | 2900 fps | 97% |
| Rottweil R 901 | <<locked>> | 86% | 41,379 psi | 86% | 2779 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 92% | 43,047 psi | 90% | 2818 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 41,481 psi | 87% | 2841 fps | 97.8% |
| Shooters World Precision | <<locked>> | 94% | 43,308 psi | 90% | 2848 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 43,221 psi | 90% | 2789 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 42,873 psi | 90% | 2812 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 42,395 psi | 89% | 2749 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 41,727 psi | 87% | 2746 fps | 99.1% |
| Somchem S321 | <<locked>> | 84% | 41,220 psi | 86% | 2808 fps | 96.3% |
| Somchem S335 | <<locked>> | 88% | 41,756 psi | 87% | 2753 fps | 99% |
| Vihtavuori N130 | <<locked>> | 84% | 42,656 psi | 89% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 42,148 psi | 88% | 2753 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 92% | 41,481 psi | 87% | 2822 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 92% | 43,236 psi | 90% | 2825 fps | 99% |
| Vihtavuori N150 | <<locked>> | 98% | 42,076 psi | 88% | 2812 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 86% | 41,075 psi | 86% | 2779 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 92% | 41,887 psi | 88% | 2815 fps | 98.4% |
| Winchester 748 | <<locked>> | 88% | 41,930 psi | 88% | 2864 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 2015 | <<locked>> | 80% | 34,853 psi | 73% | 2631 fps | 99% |
| Accurate 2460 | <<locked>> | 80% | 37,434 psi | 78% | 2707 fps | 97.2% |
| Accurate 2495 | <<locked>> | 80% | 27,122 psi | 57% | 2490 fps | 97.1% |
| Accurate 2520 | <<locked>> | 80% | 32,808 psi | 69% | 2635 fps | 95.2% |
| Accurate 4064 | <<locked>> | 84% | 29,370 psi | 61% | 2566 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 38,421 psi | 80% | 2726 fps | 95% |
| Alliant AR-Comp | <<locked>> | 80% | 31,691 psi | 66% | 2641 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 40,596 psi | 85% | 2825 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,595 psi | 83% | 2749 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 39,929 psi | 83% | 2822 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 38,305 psi | 80% | 2680 fps | 95.7% |
| Hodgdon BL-C2 | 29.2 gr | 84% | 36,042 psi | 75% | 2726 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 38,363 psi | 80% | 2753 fps | 98.5% |
| Hodgdon H335 | <<locked>> | 80% | 38,885 psi | 81% | 2762 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 39,798 psi | 83% | 2835 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,772 psi | 52% | 1650 fps | 100% |
| IMR 3031 | 25.2 gr | 80% | 30,385 psi | 63% | 2615 fps | 97% |
| IMR 8208 XBR | <<locked>> | 84% | 38,421 psi | 80% | 2726 fps | 95% |
| Lovex D073.5 | <<locked>> | 80% | 37,231 psi | 78% | 2700 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 84% | 33,750 psi | 71% | 2667 fps | 95.5% |
| Lovex S062 | <<locked>> | 90% | 38,464 psi | 80% | 2743 fps | 95.2% |
| Norma 201 | <<locked>> | 88% | 40,335 psi | 84% | 2772 fps | 95.8% |
| Norma 202 | <<locked>> | 80% | 31,140 psi | 65% | 2575 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,932 psi | 52% | 1693 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 37,971 psi | 79% | 2720 fps | 96.5% |
| ReloadSwiss RS 60 | 31.5 gr | 92% | 36,129 psi | 75% | 2779 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 34,722 psi | 73% | 2628 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 88% | 38,247 psi | 80% | 2717 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,750 psi | 71% | 2667 fps | 95.5% |
| Shooters World Precision | <<locked>> | 90% | 38,464 psi | 80% | 2743 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 40,364 psi | 84% | 2730 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 40,306 psi | 84% | 2762 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,257 psi | 69% | 2546 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 28,616 psi | 60% | 2444 fps | 95.5% |
| Somchem S321 | <<locked>> | 82% | 38,479 psi | 80% | 2749 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 32,460 psi | 68% | 2546 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 80% | 37,840 psi | 79% | 2657 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 80% | 33,098 psi | 69% | 2562 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 80% | 28,065 psi | 59% | 2510 fps | 97.3% |
| Vihtavuori N140 | <<locked>> | 82% | 31,430 psi | 66% | 2562 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 94% | 36,825 psi | 77% | 2700 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 84% | 38,290 psi | 80% | 2720 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 84% | 32,140 psi | 67% | 2592 fps | 95.5% |
| Winchester 748 | <<locked>> | 84% | 36,912 psi | 77% | 2753 fps | 95.6% |
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 44 powders for 6 x 52 R BB2 loaded with the .243 | 80gr | Frontier BTSP. IMR 3031 delivers the highest muzzle velocity at 2,900 fps; across all powders the maximum-charge window runs from 1,844 fps to 2,900 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. 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. ReloadSwiss RS 60, IMR 3031, Hodgdon BL-C2 rank at the top here: for 6 x 52 R BB2 with the .243 | 80gr | Frontier BTSP 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.