Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 105gr | Speer RN bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Reloder-16.
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 2495 | <<locked>> | 84% | 41,872 psi | 87% | 2490 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 42,279 psi | 88% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 43,163 psi | 90% | 2608 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 86% | 41,872 psi | 87% | 2500 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 42,119 psi | 88% | 2621 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 40,930 psi | 86% | 2516 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 84% | 41,379 psi | 86% | 2526 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 96% | 43,265 psi | 90% | 2621 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 40,582 psi | 85% | 2598 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,809 psi | 73% | 2467 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 42,569 psi | 89% | 2549 fps | 97.2% |
| Bofors RP3 | <<locked>> | 86% | 40,625 psi | 85% | 2523 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 41,713 psi | 87% | 2523 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 42,061 psi | 88% | 2559 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 42,177 psi | 88% | 2579 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 73% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 42,119 psi | 88% | 2513 fps | 98.5% |
| IMR 3031 | <<locked>> | 82% | 42,757 psi | 89% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 41,104 psi | 86% | 2480 fps | 97.5% |
| IMR 4831 | <<locked>> | 96% | 41,481 psi | 87% | 2562 fps | 96.9% |
| IMR 4895 | <<locked>> | 84% | 42,366 psi | 89% | 2556 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 82% | 42,090 psi | 88% | 2526 fps | 99.8% |
| Lovex S062 | <<locked>> | 84% | 41,017 psi | 86% | 2487 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 42,583 psi | 89% | 2503 fps | 99.1% |
| Norma 202 | <<locked>> | 82% | 42,583 psi | 89% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 84% | 40,698 psi | 85% | 2516 fps | 97.9% |
| Norma URP | <<locked>> | 94% | 40,640 psi | 85% | 2556 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 86% | 43,279 psi | 90% | 2585 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 74% | 1680 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 43,207 psi | 90% | 2625 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 43,308 psi | 90% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 43,221 psi | 90% | 2631 fps | 97% |
| Rottweil R 902 | <<locked>> | 84% | 42,844 psi | 90% | 2500 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 88% | 40,901 psi | 85% | 2520 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 42,090 psi | 88% | 2526 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 41,017 psi | 86% | 2487 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 41,901 psi | 88% | 2566 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 41,959 psi | 88% | 2516 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 41,075 psi | 86% | 2418 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 41,524 psi | 87% | 2520 fps | 98.4% |
| Somchem S365 | <<locked>> | 98% | 41,176 psi | 86% | 2612 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 84% | 42,076 psi | 88% | 2487 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 42,873 psi | 90% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 42,395 psi | 89% | 2507 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 94% | 42,888 psi | 90% | 2562 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 84% | 41,249 psi | 86% | 2484 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 94% | 42,206 psi | 88% | 2566 fps | 96.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,869 psi | 77% | 2533 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 40,814 psi | 85% | 2500 fps | 98.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,292 psi | 86% | 2520 fps | 98.5% |
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 2495 | <<locked>> | 80% | 36,796 psi | 77% | 2398 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 34,780 psi | 73% | 2388 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 37,710 psi | 79% | 2507 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,606 psi | 72% | 2349 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 36,550 psi | 76% | 2497 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,040 psi | 71% | 2372 fps | 96.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,550 psi | 76% | 2428 fps | 96.1% |
| Alliant Reloder-16 | 29.4 gr | 90% | 36,230 psi | 76% | 2470 fps | 95% |
| Alliant Reloder-17 | 29.5 gr | 84% | 33,330 psi | 70% | 2431 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 32,619 psi | 68% | 2411 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,494 psi | 83% | 2487 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 33,315 psi | 70% | 2369 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 84% | 39,015 psi | 82% | 2470 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 33,069 psi | 69% | 2369 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,869 psi | 77% | 2470 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 54% | 1463 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,407 psi | 82% | 2461 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 40,219 psi | 84% | 2507 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,289 psi | 76% | 2382 fps | 96.1% |
| IMR 4831 | <<locked>> | 92% | 36,506 psi | 76% | 2461 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,362 psi | 78% | 2457 fps | 97% |
| Lovex D073.6 | <<locked>> | 80% | 39,262 psi | 82% | 2477 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 36,187 psi | 76% | 2392 fps | 97.9% |
| Norma 201 | <<locked>> | 80% | 39,856 psi | 83% | 2451 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 40,147 psi | 84% | 2467 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,911 psi | 75% | 2418 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 38,319 psi | 80% | 2510 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 35,143 psi | 73% | 2418 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,266 psi | 55% | 1503 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,884 psi | 79% | 2520 fps | 96.5% |
| ReloadSwiss RS 60 | 28.1 gr | 80% | 31,140 psi | 65% | 2385 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 37,753 psi | 79% | 2523 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 37,826 psi | 79% | 2405 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 31,285 psi | 65% | 2313 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,262 psi | 82% | 2477 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 36,187 psi | 76% | 2392 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,474 psi | 68% | 2362 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,305 psi | 82% | 2464 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,026 psi | 71% | 2287 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 32,329 psi | 68% | 2323 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 28,108 psi | 59% | 2297 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 36,898 psi | 77% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,811 psi | 79% | 2402 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 30,647 psi | 64% | 2267 fps | 96.7% |
| Vihtavuori N160 | <<locked>> | 90% | 37,492 psi | 78% | 2457 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 36,463 psi | 76% | 2392 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 92% | 39,436 psi | 82% | 2513 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 98% | 34,809 psi | 73% | 2487 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,386 psi | 66% | 2290 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,261 psi | 80% | 2461 fps | 97.8% |
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 50 powders for 6 x 52 R BB2 loaded with the .243 | 105gr | Speer RN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,664 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,664 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.243" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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, Alliant Reloder-17, Alliant Reloder-16 rank at the top here: for 6 x 52 R BB2 with the .243 | 105gr | Speer RN 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.