Load Specifications
Load data in caliber 10.75 x 68 with .423 | 280gr | Reichenberg HDB Universal bullet and 44 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 Hodgdon H322.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 94% | 41,466 psi | 87% | 2415 fps | 99.6% |
| Accurate 2460 | <<locked>> | 92% | 42,699 psi | 89% | 2451 fps | 97.9% |
| Accurate 2495ᴾ | <<locked>> | 100% | 37,840 psi | 79% | 2425 fps | 99.5% |
| Accurate 2520 | <<locked>> | 96% | 42,699 psi | 89% | 2487 fps | 97.6% |
| Accurate 4064ᴾ | <<locked>> | 100% | 35,259 psi | 74% | 2392 fps | 97.1% |
| Accurate LT-30 | <<locked>> | 86% | 42,830 psi | 89% | 2352 fps | 98.9% |
| Accurate LT-32 | <<locked>> | 86% | 43,279 psi | 90% | 2359 fps | 97.4% |
| ADI AR 2207 | <<locked>> | 84% | 42,090 psi | 88% | 2402 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 42,859 psi | 90% | 2474 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 96% | 40,915 psi | 85% | 2480 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 90% | 42,264 psi | 88% | 2441 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 82% | 40,814 psi | 85% | 2359 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 40,843 psi | 85% | 2339 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 92% | 41,742 psi | 87% | 2385 fps | 95.9% |
| Hodgdon BL-C2 | <<locked>> | 96% | 40,756 psi | 85% | 2470 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 90% | 41,452 psi | 87% | 2451 fps | 98.7% |
| Hodgdon H335 | <<locked>> | 90% | 42,250 psi | 88% | 2464 fps | 98% |
| Hodgdon H4198 | <<locked>> | 82% | 41,785 psi | 87% | 2349 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,633 psi | 66% | 1535 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 41,336 psi | 86% | 2507 fps | 99.3% |
| IMR 4198 | <<locked>> | 88% | 41,742 psi | 87% | 2388 fps | 100% |
| Lovex D073.4 | <<locked>> | 84% | 40,292 psi | 84% | 2415 fps | 96.7% |
| Lovex D073.5 | <<locked>> | 92% | 42,598 psi | 89% | 2448 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 98% | 40,234 psi | 84% | 2457 fps | 97.1% |
| Norma 200 | <<locked>> | 86% | 42,148 psi | 88% | 2425 fps | 100% |
| Norma 202 | <<locked>> | 98% | 42,148 psi | 88% | 2464 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,502 psi | 66% | 1572 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 41,249 psi | 86% | 2425 fps | 96.8% |
| Rottweil R 901 | <<locked>> | 94% | 40,814 psi | 85% | 2411 fps | 97.5% |
| Shooters World AR Plus | <<locked>> | 84% | 40,292 psi | 84% | 2415 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 98% | 40,234 psi | 84% | 2457 fps | 97.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 42,496 psi | 89% | 2178 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 43,294 psi | 90% | 2477 fps | 98.1% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 40,582 psi | 85% | 2405 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 43,178 psi | 90% | 2392 fps | 98% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,160 psi | 82% | 2339 fps | 98.2% |
| Somchem S335 | <<locked>> | 96% | 41,582 psi | 87% | 2388 fps | 98.5% |
| Vihtavuori N120 | <<locked>> | 84% | 42,235 psi | 88% | 2359 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 43,250 psi | 90% | 2402 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 42,453 psi | 89% | 2395 fps | 99.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 39,885 psi | 83% | 2441 fps | 99.6% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 42,757 psi | 89% | 2448 fps | 98.4% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 41,307 psi | 86% | 2441 fps | 97.7% |
| Winchester 748 | <<locked>> | 96% | 42,337 psi | 88% | 2490 fps | 96.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 26,324 psi | 55% | 2113 fps | 96% |
| Accurate 2460 | <<locked>> | 84% | 32,227 psi | 67% | 2260 fps | 95% |
| Accurate 2495 | <<locked>> | 86% | 23,163 psi | 48% | 2106 fps | 95.2% |
| Accurate 2520 | <<locked>> | 90% | 34,374 psi | 72% | 2339 fps | 95.3% |
| Accurate 4064 | <<locked>> | 96% | 30,821 psi | 64% | 2300 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 35,404 psi | 74% | 2224 fps | 97.4% |
| Accurate LT-32 | <<locked>> | 80% | 35,795 psi | 75% | 2228 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 36,840 psi | 77% | 2316 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 32,561 psi | 68% | 2280 fps | 96.4% |
| Alliant AR-Comp | 54.1 gr | 80% | 24,366 psi | 51% | 2123 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 30,647 psi | 64% | 2228 fps | 98.6% |
| Alliant Reloder-7 | <<locked>> | 80% | 38,392 psi | 80% | 2320 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 33,533 psi | 70% | 2208 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 90% | 39,218 psi | 82% | 2339 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 94% | 38,000 psi | 79% | 2418 fps | 95% |
| Hodgdon H322 | 55.8 gr | 80% | 29,762 psi | 62% | 2215 fps | 95.2% |
| Hodgdon H335 | <<locked>> | 82% | 32,068 psi | 67% | 2270 fps | 95% |
| Hodgdon H4198 | <<locked>> | 80% | 39,131 psi | 82% | 2303 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,163 psi | 48% | 1371 fps | 100% |
| IMR 3031 | 58 gr | 86% | 28,108 psi | 59% | 2228 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 32,866 psi | 69% | 2228 fps | 99.5% |
| Lovex D073.4 | <<locked>> | 80% | 34,809 psi | 73% | 2313 fps | 95% |
| Lovex D073.5 | <<locked>> | 88% | 36,927 psi | 77% | 2349 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 94% | 35,012 psi | 73% | 2365 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 34,650 psi | 72% | 2297 fps | 99.7% |
| Norma 202 | <<locked>> | 90% | 32,460 psi | 68% | 2287 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,032 psi | 48% | 1407 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 36,027 psi | 75% | 2329 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 88% | 33,953 psi | 71% | 2283 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 34,809 psi | 73% | 2313 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 94% | 35,012 psi | 73% | 2365 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 40,335 psi | 84% | 2149 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 32,779 psi | 68% | 2280 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 31,372 psi | 66% | 2228 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 33,446 psi | 70% | 2218 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 30,530 psi | 64% | 2172 fps | 95.6% |
| Somchem S335 | <<locked>> | 86% | 30,429 psi | 64% | 2178 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 37,028 psi | 77% | 2280 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 29,588 psi | 62% | 2152 fps | 98% |
| Vihtavuori N133 | <<locked>> | 80% | 25,701 psi | 54% | 2060 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 86% | 25,440 psi | 53% | 2133 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 90% | 31,053 psi | 65% | 2228 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 94% | 33,866 psi | 71% | 2303 fps | 95.6% |
| Winchester 748 | <<locked>> | 94% | 39,537 psi | 83% | 2441 fps | 95.7% |
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 81 powders for 10.75 x 68 loaded with the .423 | 280gr | Reichenberg HDB Universal. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,535 fps to 2,533 fps. Accurate 2495 gives the best case fill at 100 %, and 81 of the 81 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. Accurate 2495, Accurate 4064, ADI AR 2208 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, Hodgdon H322 rank at the top here: for 10.75 x 68 with the .423 | 280gr | Reichenberg HDB Universal they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, Accurate 2230, ADI AR 2206H burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.