Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 70gr | Rhino Penetrator bullet and 31 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% | 42,221 psi | 88% | 2972 fps | 99.5% |
| Accurate 2460 | <<locked>> | 84% | 40,538 psi | 85% | 2949 fps | 96.9% |
| Accurate 2495 | <<locked>> | 94% | 40,799 psi | 85% | 2999 fps | 99.5% |
| Accurate 2520 | <<locked>> | 88% | 41,060 psi | 86% | 2999 fps | 96.7% |
| Accurate 4064 | <<locked>> | 98% | 43,308 psi | 90% | 3071 fps | 98.3% |
| ADI AR 2219 | <<locked>> | 82% | 42,482 psi | 89% | 3025 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 90% | 41,742 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 42,453 psi | 89% | 2999 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 42,743 psi | 89% | 2913 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 84% | 41,220 psi | 86% | 2999 fps | 98.3% |
| Hodgdon H335 | <<locked>> | 84% | 42,047 psi | 88% | 3012 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,880 psi | 69% | 1982 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,699 psi | 89% | 3091 fps | 99.2% |
| IMR 4198 | <<locked>> | 82% | 41,307 psi | 86% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 42,105 psi | 88% | 3035 fps | 97% |
| Norma 202 | <<locked>> | 92% | 43,236 psi | 90% | 3035 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,199 psi | 69% | 2034 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 41,046 psi | 86% | 2966 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 88% | 41,771 psi | 87% | 2969 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 42,105 psi | 88% | 3035 fps | 97% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 43,062 psi | 90% | 3025 fps | 97.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 43,236 psi | 90% | 3009 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 40,524 psi | 85% | 2887 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 42,119 psi | 88% | 2933 fps | 98.5% |
| Somchem S335 | <<locked>> | 90% | 42,293 psi | 88% | 2943 fps | 98.3% |
| Vihtavuori N130 | <<locked>> | 84% | 40,582 psi | 85% | 2897 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 90% | 42,946 psi | 90% | 2953 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 94% | 41,336 psi | 86% | 3005 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 92% | 40,973 psi | 86% | 2959 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 94% | 42,206 psi | 88% | 2995 fps | 97.5% |
| Winchester 748 | <<locked>> | 90% | 42,786 psi | 89% | 3061 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% | 32,735 psi | 68% | 2753 fps | 97.5% |
| Accurate 2460 | <<locked>> | 80% | 35,447 psi | 74% | 2831 fps | 95.3% |
| Accurate 2495 | <<locked>> | 82% | 27,166 psi | 57% | 2654 fps | 95.8% |
| Accurate 2520 | <<locked>> | 86% | 38,334 psi | 80% | 2940 fps | 95.9% |
| Accurate 4064 | 30.2 gr | 90% | 33,533 psi | 70% | 2848 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 39,668 psi | 83% | 2966 fps | 97.9% |
| Alliant AR-Comp | 26.5 gr | 80% | 30,008 psi | 63% | 2769 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,768 psi | 79% | 2894 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,205 psi | 84% | 2861 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 36,260 psi | 76% | 2884 fps | 97% |
| Hodgdon H335 | <<locked>> | 80% | 36,796 psi | 77% | 2890 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,250 psi | 51% | 1775 fps | 100% |
| IMR 3031 | 27.1 gr | 82% | 30,530 psi | 64% | 2785 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 38,914 psi | 81% | 2887 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 88% | 36,666 psi | 77% | 2910 fps | 95.3% |
| Norma 202 | <<locked>> | 86% | 35,665 psi | 75% | 2864 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,323 psi | 51% | 1818 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 38,406 psi | 80% | 2904 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 82% | 34,998 psi | 73% | 2808 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 36,666 psi | 77% | 2910 fps | 95.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,335 psi | 84% | 2966 fps | 97% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,029 psi | 79% | 2897 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 35,723 psi | 75% | 2776 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 30,835 psi | 64% | 2664 fps | 95.1% |
| Somchem S335 | <<locked>> | 82% | 32,924 psi | 69% | 2723 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 35,824 psi | 75% | 2792 fps | 99% |
| Vihtavuori N133 | <<locked>> | 80% | 31,227 psi | 65% | 2684 fps | 96.9% |
| Vihtavuori N135 | <<locked>> | 80% | 26,252 psi | 55% | 2615 fps | 95% |
| Vihtavuori N140 | <<locked>> | 86% | 33,533 psi | 70% | 2782 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 88% | 34,664 psi | 72% | 2822 fps | 95.2% |
| Winchester 748 | <<locked>> | 88% | 40,103 psi | 84% | 2999 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 BB2 loaded with the .243 | 70gr | Rhino Penetrator. IMR 3031 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,091 fps. Hodgdon TrailBoss 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 69–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.243" calls for a 1:11.5 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. Alliant AR-Comp, IMR 3031, Accurate 4064 rank at the top here: for 6 x 52 R BB2 with the .243 | 70gr | Rhino Penetrator 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.