Load Specifications
Load data in caliber 8 x 57 IRS with .323 | 200gr | Barnes TSX BT bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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>> | 82% | 41,220 psi | 86% | 2303 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 42,902 psi | 90% | 2385 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 42,699 psi | 89% | 2398 fps | 99.7% |
| Accurate 4064 | <<locked>> | 92% | 43,004 psi | 90% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,452 psi | 87% | 2451 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 86% | 43,004 psi | 90% | 2402 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 90% | 41,481 psi | 87% | 2356 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 42,670 psi | 89% | 2369 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 84% | 41,379 psi | 86% | 2365 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 41,814 psi | 87% | 2467 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 42,902 psi | 90% | 2421 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 88% | 40,828 psi | 85% | 2382 fps | 96.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,424 psi | 89% | 2457 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 42,685 psi | 89% | 2497 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 42,090 psi | 88% | 2402 fps | 96.5% |
| Bofors RP3 | <<locked>> | 92% | 42,105 psi | 88% | 2421 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 42,409 psi | 89% | 2323 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 86% | 43,308 psi | 90% | 2431 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 82% | 41,713 psi | 87% | 2448 fps | 97% |
| Hodgdon H4895 | <<locked>> | 84% | 40,654 psi | 85% | 2365 fps | 97.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,566 psi | 81% | 2356 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 41,553 psi | 87% | 2431 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,185 psi | 71% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 42,061 psi | 88% | 2372 fps | 98.1% |
| IMR 3031 | <<locked>> | 86% | 42,003 psi | 88% | 2411 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 40,828 psi | 85% | 2339 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 39,885 psi | 83% | 2402 fps | 95.8% |
| IMR 4895 | <<locked>> | 88% | 41,785 psi | 87% | 2411 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 84% | 42,670 psi | 89% | 2369 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 86% | 41,031 psi | 86% | 2379 fps | 99.6% |
| Lovex S060 | <<locked>> | 84% | 41,278 psi | 86% | 2303 fps | 97.4% |
| Lovex S062 | <<locked>> | 90% | 42,801 psi | 89% | 2385 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 42,032 psi | 88% | 2359 fps | 98.7% |
| Norma 202 | <<locked>> | 86% | 42,177 psi | 88% | 2372 fps | 99.9% |
| Norma 203B | <<locked>> | 90% | 42,685 psi | 89% | 2418 fps | 97.8% |
| Norma URPᴾ | <<locked>> | 100% | 42,163 psi | 88% | 2451 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 90% | 42,656 psi | 89% | 2438 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 41,640 psi | 87% | 2385 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,316 psi | 72% | 1542 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 42,670 psi | 89% | 2477 fps | 97.3% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 42,902 psi | 90% | 2513 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 43,178 psi | 90% | 2359 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 88% | 42,264 psi | 88% | 2356 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 94% | 41,974 psi | 88% | 2411 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 41,031 psi | 86% | 2379 fps | 99.6% |
| Shooters World Precision | <<locked>> | 90% | 42,801 psi | 89% | 2385 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 41,162 psi | 86% | 2418 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 41,452 psi | 87% | 2372 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 41,539 psi | 87% | 2287 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 41,089 psi | 86% | 2290 fps | 100% |
| Somchem S321 | <<locked>> | 82% | 42,757 psi | 89% | 2392 fps | 99% |
| Somchem S335 | <<locked>> | 84% | 40,785 psi | 85% | 2287 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 42,975 psi | 90% | 2388 fps | 97.7% |
| Somchem S355 | <<locked>> | 94% | 43,236 psi | 90% | 2418 fps | 98.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,405 psi | 78% | 2402 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 84% | 41,611 psi | 87% | 2287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 41,205 psi | 86% | 2346 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 42,438 psi | 89% | 2356 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 41,481 psi | 87% | 2362 fps | 99% |
| Vihtavuori N160 | <<locked>> | 98% | 41,930 psi | 88% | 2408 fps | 96% |
| Vihtavuori N530 | <<locked>> | 84% | 42,786 psi | 89% | 2365 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 88% | 40,930 psi | 86% | 2349 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 43,004 psi | 90% | 2398 fps | 98.2% |
| Winchester 748 | <<locked>> | 84% | 41,452 psi | 87% | 2402 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 40,727 psi | 85% | 2379 fps | 97.9% |
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 2015 | <<locked>> | 80% | 38,580 psi | 81% | 2257 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 30,676 psi | 64% | 2165 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 37,159 psi | 78% | 2300 fps | 99.1% |
| Accurate 4064 | <<locked>> | 80% | 29,051 psi | 61% | 2146 fps | 98.1% |
| Accurate 4350 | <<locked>> | 98% | 38,580 psi | 81% | 2398 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 35,534 psi | 74% | 2257 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 86% | 36,521 psi | 76% | 2260 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,594 psi | 79% | 2277 fps | 97.7% |
| Alliant AR-Comp | <<locked>> | 80% | 36,216 psi | 76% | 2283 fps | 100% |
| Alliant Power Pro 2000-MR | 46.2 gr | 86% | 39,001 psi | 81% | 2411 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 30,879 psi | 65% | 2182 fps | 95.3% |
| Alliant Reloder-15 | <<locked>> | 84% | 35,882 psi | 75% | 2287 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,103 psi | 84% | 2415 fps | 95.6% |
| Alliant Reloder-17 | 47.6 gr | 90% | 34,940 psi | 73% | 2336 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 39,320 psi | 82% | 2352 fps | 95.7% |
| Bofors RP3 | <<locked>> | 82% | 29,907 psi | 62% | 2172 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,827 psi | 83% | 2277 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,215 psi | 74% | 2280 fps | 97.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 38,870 psi | 81% | 2395 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 80% | 35,781 psi | 75% | 2267 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,142 psi | 71% | 2264 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,865 psi | 67% | 2228 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,280 psi | 53% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,432 psi | 72% | 2224 fps | 96% |
| IMR 3031 | <<locked>> | 80% | 34,374 psi | 72% | 2274 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 35,882 psi | 75% | 2241 fps | 95.3% |
| IMR 4831 | <<locked>> | 98% | 37,376 psi | 78% | 2352 fps | 95% |
| IMR 4895 | <<locked>> | 82% | 34,389 psi | 72% | 2267 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 37,594 psi | 79% | 2277 fps | 97.7% |
| Lovex D073.6 | <<locked>> | 80% | 33,388 psi | 70% | 2234 fps | 98.3% |
| Lovex S060 | <<locked>> | 80% | 36,637 psi | 77% | 2215 fps | 96.2% |
| Lovex S062 | <<locked>> | 80% | 31,198 psi | 65% | 2156 fps | 95.9% |
| Norma 201 | <<locked>> | 80% | 34,650 psi | 72% | 2218 fps | 97% |
| Norma 202 | <<locked>> | 80% | 34,664 psi | 72% | 2234 fps | 99% |
| Norma 203B | <<locked>> | 84% | 35,215 psi | 74% | 2277 fps | 95.8% |
| Norma URP | <<locked>> | 98% | 39,523 psi | 83% | 2398 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 84% | 34,954 psi | 73% | 2287 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,216 psi | 76% | 2283 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,483 psi | 53% | 1378 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 37,159 psi | 78% | 2372 fps | 95.7% |
| ReloadSwiss RS 60 | 43.4 gr | 82% | 28,761 psi | 60% | 2188 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 38,247 psi | 80% | 2270 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 32,866 psi | 69% | 2175 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 86% | 32,140 psi | 67% | 2218 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,388 psi | 70% | 2234 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 31,198 psi | 65% | 2156 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 36,361 psi | 76% | 2323 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,113 psi | 71% | 2228 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,651 psi | 77% | 2198 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,834 psi | 62% | 2077 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 39,856 psi | 83% | 2339 fps | 98.5% |
| Somchem S335 | <<locked>> | 80% | 35,955 psi | 75% | 2201 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 34,780 psi | 73% | 2238 fps | 95.4% |
| Somchem S355 | <<locked>> | 86% | 33,620 psi | 70% | 2234 fps | 95.8% |
| Somchem S365 | <<locked>> | 94% | 30,922 psi | 65% | 2251 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 36,753 psi | 77% | 2205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,763 psi | 66% | 2175 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 32,706 psi | 68% | 2178 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 82% | 27,876 psi | 58% | 2083 fps | 95% |
| Vihtavuori N160 | <<locked>> | 96% | 39,059 psi | 82% | 2356 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 37,289 psi | 78% | 2267 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 80% | 31,299 psi | 65% | 2162 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,083 psi | 69% | 2201 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 36,172 psi | 76% | 2303 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,156 psi | 69% | 2228 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 65 powders for 8 x 57 IRS loaded with the .323 | 200gr | Barnes TSX BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,513 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,513 fps. Accurate 4350 gives the best case fill at 100 %, and 65 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.323" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 8 x 57 IRS with the .323 | 200gr | Barnes TSX BT 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.