Load Specifications
Load data in caliber 6 x 52 R BB2 with .243 | 55gr | Nosler Ballistic Tip Lead Free bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Alliant Reloder-10x and IMR 4198.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 42,931 psi | 90% | 3209 fps | 98.6% |
| Accurate 2015 | <<locked>> | 96% | 42,598 psi | 89% | 3284 fps | 97.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 36,303 psi | 76% | 3205 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 86% | 42,569 psi | 89% | 3297 fps | 100% |
| Alliant AR-Comp | <<locked>> | 98% | 42,119 psi | 88% | 3373 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 92% | 43,207 psi | 90% | 3333 fps | 98.7% |
| Alliant Reloder-7 | <<locked>> | 84% | 41,568 psi | 87% | 3232 fps | 98.8% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 42,235 psi | 88% | 3186 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 92% | 42,670 psi | 89% | 3327 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,053 psi | 65% | 2188 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 42,641 psi | 89% | 3392 fps | 96.9% |
| IMR 4198 | <<locked>> | 90% | 42,743 psi | 89% | 3284 fps | 99.3% |
| Norma 200 | <<locked>> | 88% | 43,192 psi | 90% | 3314 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,647 psi | 64% | 2234 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 43,062 psi | 90% | 3051 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 41,350 psi | 86% | 3274 fps | 96.5% |
| Somchem S335 | <<locked>> | 98% | 42,656 psi | 89% | 3235 fps | 95.8% |
| Vihtavuori N120 | <<locked>> | 86% | 42,699 psi | 89% | 3251 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 41,742 psi | 87% | 3225 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 96% | 40,727 psi | 85% | 3202 fps | 97.1% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 38,247 psi | 80% | 3238 fps | 96.9% |
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 1680 | <<locked>> | 80% | 40,074 psi | 84% | 3146 fps | 98% |
| Accurate 2015 | <<locked>> | 90% | 34,983 psi | 73% | 3100 fps | 95.5% |
| Accurate 2495 | <<locked>> | 98% | 33,591 psi | 70% | 3133 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 35,215 psi | 74% | 3127 fps | 99.5% |
| Alliant AR-Comp | 27.9 gr | 86% | 28,239 psi | 59% | 2976 fps | 95.1% |
| Alliant Reloder-10x | 25.9 gr | 82% | 30,966 psi | 65% | 3018 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 36,448 psi | 76% | 3110 fps | 97.6% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 39,523 psi | 83% | 3123 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 90% | 39,726 psi | 83% | 3258 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,495 psi | 47% | 1959 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 37,362 psi | 78% | 3255 fps | 95.1% |
| IMR 4198 | 24 gr | 80% | 31,241 psi | 65% | 2982 fps | 96.2% |
| Norma 200 | <<locked>> | 80% | 32,764 psi | 68% | 3058 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,307 psi | 47% | 2008 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 38,508 psi | 80% | 2966 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 38,856 psi | 81% | 3215 fps | 95.8% |
| Somchem S335 | <<locked>> | 96% | 40,248 psi | 84% | 3182 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 35,389 psi | 74% | 3091 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 32,053 psi | 67% | 2979 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 92% | 36,129 psi | 75% | 3091 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 96% | 33,402 psi | 70% | 3107 fps | 95% |
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 21 powders for 6 x 52 R BB2 loaded with the .243 | 55gr | Nosler Ballistic Tip Lead Free. IMR 3031 delivers the highest muzzle velocity at 3,392 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,392 fps. Accurate 2495 gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 64–90 %, leaving at least 10 % headroom. The 55.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, IMR 3031 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, Alliant Reloder-10x, IMR 4198 rank at the top here: for 6 x 52 R BB2 with the .243 | 55gr | Nosler Ballistic Tip Lead Free 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.