Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 150gr | Ferrobull Entox Sport bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Winchester 748 and Accurate 2495.
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% | 40,901 psi | 85% | 2671 fps | 99.7% |
| Accurate 2460 | <<locked>> | 86% | 41,640 psi | 87% | 2710 fps | 98% |
| Accurate 2495 | <<locked>> | 96% | 41,176 psi | 86% | 2743 fps | 99.9% |
| Accurate 2520 | <<locked>> | 90% | 42,003 psi | 88% | 2756 fps | 97.7% |
| Accurate 4064 | <<locked>> | 98% | 41,292 psi | 86% | 2769 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 82% | 43,163 psi | 90% | 2635 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 41,104 psi | 86% | 2720 fps | 98.9% |
| ADI Benchmark 8208 | <<locked>> | 90% | 42,888 psi | 90% | 2730 fps | 96% |
| Alliant AR-Comp | <<locked>> | 92% | 43,076 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 41,408 psi | 87% | 2694 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 41,568 psi | 87% | 2625 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 88% | 42,830 psi | 89% | 2687 fps | 96.6% |
| Hodgdon BL-C2 | <<locked>> | 92% | 43,062 psi | 90% | 2792 fps | 96.8% |
| Hodgdon H322 | <<locked>> | 86% | 42,946 psi | 90% | 2756 fps | 99.1% |
| Hodgdon H335 | <<locked>> | 84% | 40,727 psi | 85% | 2713 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,866 psi | 69% | 1749 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 41,075 psi | 86% | 2782 fps | 99.5% |
| IMR 4198 | <<locked>> | 84% | 42,917 psi | 90% | 2677 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 42,888 psi | 90% | 2730 fps | 96% |
| Lovex D073.5 | <<locked>> | 86% | 41,669 psi | 87% | 2710 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 94% | 43,062 psi | 90% | 2789 fps | 97.9% |
| Lovex S062 | <<locked>> | 96% | 42,163 psi | 88% | 2736 fps | 96% |
| Norma 201 | <<locked>> | 92% | 41,727 psi | 87% | 2710 fps | 95.8% |
| Norma 202 | <<locked>> | 92% | 41,611 psi | 87% | 2733 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,967 psi | 69% | 1791 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 42,525 psi | 89% | 2726 fps | 97.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 42,757 psi | 89% | 2844 fps | 97% |
| Rottweil R 901 | <<locked>> | 90% | 42,815 psi | 89% | 2720 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 94% | 41,901 psi | 88% | 2707 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 43,062 psi | 90% | 2789 fps | 97.9% |
| Shooters World Precision | <<locked>> | 96% | 42,163 psi | 88% | 2736 fps | 96% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 41,713 psi | 87% | 2726 fps | 98.1% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 42,293 psi | 88% | 2707 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 41,887 psi | 88% | 2648 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 40,785 psi | 85% | 2641 fps | 98.8% |
| Somchem S321 | <<locked>> | 88% | 42,975 psi | 90% | 2756 fps | 96.4% |
| Somchem S335 | <<locked>> | 90% | 40,596 psi | 85% | 2644 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 86% | 42,032 psi | 88% | 2651 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 41,611 psi | 87% | 2654 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 96% | 42,699 psi | 89% | 2759 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 94% | 41,959 psi | 88% | 2717 fps | 98.6% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 40,814 psi | 85% | 2700 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 90% | 42,917 psi | 90% | 2726 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 96% | 43,192 psi | 90% | 2753 fps | 98.3% |
| Winchester 748 | <<locked>> | 90% | 41,220 psi | 86% | 2759 fps | 96.6% |
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% | 31,430 psi | 66% | 2464 fps | 98% |
| Accurate 2460 | <<locked>> | 80% | 33,837 psi | 71% | 2543 fps | 95.8% |
| Accurate 2495 | 41.4 gr | 80% | 23,743 psi | 50% | 2320 fps | 95.2% |
| Accurate 2520 | <<locked>> | 84% | 33,982 psi | 71% | 2582 fps | 95.3% |
| Accurate 4064 | <<locked>> | 88% | 29,515 psi | 62% | 2497 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 40,582 psi | 85% | 2589 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 80% | 38,551 psi | 81% | 2667 fps | 98.4% |
| ADI Benchmark 8208 | <<locked>> | 88% | 40,103 psi | 84% | 2674 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 28,921 psi | 60% | 2484 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,419 psi | 76% | 2592 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 39,015 psi | 82% | 2572 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 37,811 psi | 79% | 2579 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 88% | 37,260 psi | 78% | 2674 fps | 95.1% |
| Hodgdon H322 | <<locked>> | 80% | 35,027 psi | 73% | 2589 fps | 97.5% |
| Hodgdon H335 | <<locked>> | 80% | 35,534 psi | 74% | 2602 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,076 psi | 50% | 1558 fps | 100% |
| IMR 3031 | 40.8 gr | 80% | 27,514 psi | 57% | 2448 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 37,985 psi | 79% | 2585 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 40,103 psi | 84% | 2674 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 82% | 36,085 psi | 75% | 2592 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 88% | 34,853 psi | 73% | 2615 fps | 95.6% |
| Lovex S062 | <<locked>> | 94% | 39,421 psi | 82% | 2677 fps | 95.1% |
| Norma 201 | <<locked>> | 90% | 39,001 psi | 81% | 2654 fps | 95% |
| Norma 202 | <<locked>> | 84% | 32,155 psi | 67% | 2523 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,076 psi | 50% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 34,882 psi | 73% | 2559 fps | 95.1% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 40,001 psi | 84% | 2779 fps | 96% |
| Rottweil R 901 | <<locked>> | 82% | 33,475 psi | 70% | 2516 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 92% | 39,363 psi | 82% | 2654 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 88% | 34,853 psi | 73% | 2615 fps | 95.6% |
| Shooters World Precision | <<locked>> | 94% | 39,421 psi | 82% | 2677 fps | 95.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 39,015 psi | 82% | 2671 fps | 97.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,130 psi | 78% | 2602 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 32,489 psi | 68% | 2444 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 29,675 psi | 62% | 2392 fps | 95.6% |
| Somchem S321 | <<locked>> | 86% | 40,161 psi | 84% | 2700 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 29,776 psi | 62% | 2395 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 34,824 psi | 73% | 2507 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 80% | 30,298 psi | 63% | 2411 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 80% | 25,237 psi | 53% | 2346 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 84% | 30,313 psi | 63% | 2454 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 98% | 38,043 psi | 79% | 2644 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 88% | 40,059 psi | 84% | 2671 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 88% | 33,156 psi | 69% | 2539 fps | 95.6% |
| Winchester 748 | 48.7 gr | 88% | 38,537 psi | 81% | 2700 fps | 95.8% |
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 45 powders for 8 x 57 IRS loaded with the .323 | 150gr | Ferrobull Entox Sport. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,844 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 45 of the 45 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 150.0 gr projectile in 0.323" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, ReloadSwiss RS 60 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. IMR 3031, Winchester 748, Accurate 2495 rank at the top here: for 8 x 57 IRS with the .323 | 150gr | Ferrobull Entox Sport 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.