Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 81gr | Peregrine Glider GRM 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 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% | 42,540 psi | 89% | 2776 fps | 99.9% |
| Accurate 2460 | <<locked>> | 84% | 40,741 psi | 85% | 2762 fps | 98% |
| Accurate 2495 | <<locked>> | 94% | 40,785 psi | 85% | 2802 fps | 99.9% |
| Accurate 2520 | <<locked>> | 88% | 41,452 psi | 87% | 2815 fps | 97.9% |
| Accurate 4064 | <<locked>> | 96% | 40,654 psi | 85% | 2825 fps | 98.7% |
| ADI AR 2219 | <<locked>> | 82% | 43,105 psi | 90% | 2835 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 88% | 42,090 psi | 88% | 2789 fps | 96.1% |
| Alliant AR-Comp | <<locked>> | 90% | 42,627 psi | 89% | 2858 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 43,236 psi | 90% | 2802 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 43,192 psi | 90% | 2723 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 41,843 psi | 87% | 2740 fps | 96.7% |
| Hodgdon BL-C2 | <<locked>> | 90% | 42,438 psi | 89% | 2851 fps | 97% |
| Hodgdon H322 | <<locked>> | 84% | 42,192 psi | 88% | 2815 fps | 99.2% |
| Hodgdon H335 | <<locked>> | 84% | 42,685 psi | 89% | 2825 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,880 psi | 69% | 1818 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,960 psi | 90% | 2890 fps | 99.8% |
| IMR 4198 | <<locked>> | 82% | 41,655 psi | 87% | 2733 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 42,090 psi | 88% | 2789 fps | 96.1% |
| Lovex D073.5 | <<locked>> | 84% | 40,582 psi | 85% | 2759 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 92% | 42,337 psi | 88% | 2841 fps | 98% |
| Lovex S062 | <<locked>> | 94% | 41,655 psi | 87% | 2795 fps | 96.2% |
| Norma 201 | <<locked>> | 90% | 41,017 psi | 86% | 2769 fps | 96% |
| Norma 202 | <<locked>> | 90% | 40,828 psi | 85% | 2789 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,272 psi | 70% | 1867 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 41,597 psi | 87% | 2779 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 42,206 psi | 88% | 2910 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 88% | 42,148 psi | 88% | 2782 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 92% | 41,234 psi | 86% | 2766 fps | 96% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 42,960 psi | 90% | 2858 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 42,337 psi | 88% | 2841 fps | 98% |
| Shooters World Precision | <<locked>> | 94% | 41,655 psi | 87% | 2795 fps | 96.2% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 41,118 psi | 86% | 2759 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 40,785 psi | 85% | 2700 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 42,438 psi | 89% | 2740 fps | 99.2% |
| Somchem S321 | <<locked>> | 86% | 42,119 psi | 88% | 2812 fps | 96.5% |
| Somchem S335 | <<locked>> | 90% | 42,612 psi | 89% | 2753 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 84% | 40,886 psi | 85% | 2703 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 43,178 psi | 90% | 2756 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 94% | 41,887 psi | 88% | 2812 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 92% | 41,278 psi | 86% | 2772 fps | 98.7% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 42,815 psi | 89% | 2808 fps | 97% |
| Vihtavuori N530 | <<locked>> | 88% | 42,105 psi | 88% | 2782 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 94% | 42,540 psi | 89% | 2808 fps | 98.5% |
| Winchester 748 | <<locked>> | 90% | 43,062 psi | 90% | 2871 fps | 97.4% |
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% | 32,938 psi | 69% | 2572 fps | 98.6% |
| Accurate 2460 | <<locked>> | 80% | 35,549 psi | 74% | 2651 fps | 96.7% |
| Accurate 2495 | <<locked>> | 80% | 25,179 psi | 53% | 2425 fps | 96.2% |
| Accurate 2520 | <<locked>> | 82% | 33,460 psi | 70% | 2638 fps | 95.5% |
| Accurate 4064 | 26.8 gr | 86% | 29,138 psi | 61% | 2549 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 39,972 psi | 84% | 2772 fps | 98.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 39,189 psi | 82% | 2726 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 30,342 psi | 63% | 2592 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 38,072 psi | 80% | 2700 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,335 psi | 84% | 2671 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 36,738 psi | 77% | 2628 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 86% | 36,651 psi | 77% | 2726 fps | 95.2% |
| Hodgdon H322 | <<locked>> | 80% | 36,695 psi | 77% | 2700 fps | 98.2% |
| Hodgdon H335 | <<locked>> | 80% | 37,318 psi | 78% | 2713 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,352 psi | 51% | 1627 fps | 100% |
| IMR 3031 | 24.6 gr | 80% | 28,718 psi | 60% | 2552 fps | 96.3% |
| IMR 4198 | <<locked>> | 80% | 39,479 psi | 82% | 2690 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 39,189 psi | 82% | 2726 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 80% | 35,375 psi | 74% | 2644 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 86% | 34,505 psi | 72% | 2674 fps | 95.8% |
| Lovex S062 | <<locked>> | 92% | 38,711 psi | 81% | 2733 fps | 95.3% |
| Norma 201 | <<locked>> | 88% | 38,174 psi | 80% | 2707 fps | 95% |
| Norma 202 | <<locked>> | 82% | 31,401 psi | 66% | 2569 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,439 psi | 51% | 1670 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 36,361 psi | 76% | 2667 fps | 96% |
| ReloadSwiss RS 60 | 31.4 gr | 94% | 36,651 psi | 77% | 2772 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 32,648 psi | 68% | 2566 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 90% | 38,783 psi | 81% | 2713 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 98% | 40,234 psi | 84% | 2802 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 86% | 34,505 psi | 72% | 2674 fps | 95.8% |
| Shooters World Precision | <<locked>> | 92% | 38,711 psi | 81% | 2733 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,522 psi | 80% | 2707 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,575 psi | 66% | 2490 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 28,921 psi | 60% | 2441 fps | 95.6% |
| Somchem S321 | <<locked>> | 84% | 39,233 psi | 82% | 2749 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 31,096 psi | 65% | 2497 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 80% | 36,071 psi | 75% | 2605 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 80% | 31,459 psi | 66% | 2507 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 80% | 26,324 psi | 55% | 2448 fps | 96.5% |
| Vihtavuori N140 | <<locked>> | 82% | 29,849 psi | 62% | 2510 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 96% | 37,681 psi | 79% | 2703 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 86% | 39,117 psi | 82% | 2723 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 86% | 32,561 psi | 68% | 2592 fps | 95.7% |
| Winchester 748 | <<locked>> | 86% | 37,695 psi | 79% | 2756 fps | 95.9% |
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 | 81gr | Peregrine Glider GRM. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,910 fps; across all powders the maximum-charge window runs from 1,818 fps to 2,910 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 69–90 %, leaving at least 10 % headroom. The 81.0 gr projectile in 0.243" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Rottweil R 903 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, Accurate 4064 rank at the top here: for 6 x 52 R BB2 with the .243 | 81gr | Peregrine Glider GRM 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.