Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 155gr | Lapua Mega bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Alliant Reloder-26 and Bofors RP15.
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 3100 | <<locked>> | 94% | 46,499 psi | 90% | 2477 fps | 99.5% |
| Accurate 4350 | <<locked>> | 84% | 45,266 psi | 88% | 2464 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 90% | 46,064 psi | 89% | 2500 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,840 psi | 72% | 2402 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 46,427 psi | 90% | 2520 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 46,441 psi | 90% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,919 psi | 89% | 2497 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,369 psi | 90% | 2549 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 44,063 psi | 86% | 2493 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,340 psi | 90% | 2579 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 46,006 psi | 89% | 2602 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 45,382 psi | 88% | 2530 fps | 97.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,337 psi | 82% | 2510 fps | 96.1% |
| Bofors RP5 | <<locked>> | 94% | 46,369 psi | 90% | 2549 fps | 97.9% |
| Bofors RP7 | <<locked>> | 82% | 46,035 psi | 89% | 2418 fps | 98.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,861 psi | 89% | 2523 fps | 97% |
| Hodgdon H414 | <<locked>> | 82% | 43,990 psi | 85% | 2454 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 46,441 psi | 90% | 2454 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,324 psi | 88% | 2615 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 84% | 46,427 psi | 90% | 2533 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 71% | 1578 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 44,121 psi | 86% | 2408 fps | 98.1% |
| IMR 4831 | <<locked>> | 86% | 46,064 psi | 89% | 2464 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,905 psi | 89% | 2441 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,947 psi | 87% | 2523 fps | 96% |
| Lovex S065 | <<locked>> | 82% | 44,947 psi | 87% | 2402 fps | 99.4% |
| Lovex S070 | <<locked>> | 84% | 45,643 psi | 89% | 2434 fps | 98.9% |
| Lovex S071 | <<locked>> | 98% | 44,309 psi | 86% | 2441 fps | 99.2% |
| Norma 204 | <<locked>> | 84% | 43,816 psi | 85% | 2438 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 45,469 psi | 88% | 2562 fps | 98.8% |
| Norma URP | <<locked>> | 84% | 44,440 psi | 86% | 2451 fps | 99.9% |
| Ramshot Grand | <<locked>> | 94% | 44,831 psi | 87% | 2533 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 86% | 46,282 psi | 90% | 2500 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 98% | 45,803 psi | 89% | 2530 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 73% | 1614 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 44,933 psi | 87% | 2484 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 46,369 psi | 90% | 2549 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,208 psi | 88% | 2612 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 44,860 psi | 87% | 2428 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 90% | 44,904 psi | 87% | 2480 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 82% | 46,035 psi | 89% | 2418 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 44,947 psi | 87% | 2402 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 84% | 45,643 psi | 89% | 2434 fps | 98.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 43,932 psi | 85% | 2352 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,512 psi | 86% | 2474 fps | 97.4% |
| Somchem S365 | <<locked>> | 86% | 43,700 psi | 85% | 2457 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 45,527 psi | 88% | 2461 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 84% | 46,224 psi | 90% | 2451 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 94% | 44,962 psi | 87% | 2444 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 84% | 45,585 psi | 89% | 2454 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 92% | 46,427 psi | 90% | 2520 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 45,818 psi | 89% | 2552 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 45,107 psi | 88% | 2533 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 45,324 psi | 88% | 2421 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 44,295 psi | 86% | 2461 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 45,179 psi | 88% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,947 psi | 87% | 2448 fps | 97.3% |
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 3100 | <<locked>> | 82% | 31,067 psi | 60% | 2178 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 39,595 psi | 77% | 2362 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 38,130 psi | 74% | 2349 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,751 psi | 67% | 2349 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,348 psi | 74% | 2372 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,352 psi | 84% | 2477 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,898 psi | 74% | 2343 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,101 psi | 74% | 2392 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,108 psi | 55% | 2156 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,834 psi | 58% | 2218 fps | 95.6% |
| Alliant Reloder-26 | 41.3 gr | 80% | 29,950 psi | 58% | 2260 fps | 96.7% |
| Bofors RP15 | 42.8 gr | 90% | 37,608 psi | 73% | 2379 fps | 95.2% |
| Bofors RP30 | <<locked>> | 98% | 39,552 psi | 77% | 2454 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 38,101 psi | 74% | 2392 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 43,076 psi | 84% | 2365 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 40,234 psi | 78% | 2411 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 41,394 psi | 80% | 2408 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,868 psi | 70% | 2270 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,420 psi | 73% | 2444 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,045 psi | 78% | 2415 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 54% | 1411 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 38,682 psi | 75% | 2303 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 37,811 psi | 73% | 2316 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,308 psi | 84% | 2395 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 42,003 psi | 82% | 2464 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 42,105 psi | 82% | 2349 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 40,292 psi | 78% | 2336 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 30,429 psi | 59% | 2162 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 38,218 psi | 74% | 2333 fps | 95.2% |
| Norma MRP | <<locked>> | 84% | 34,650 psi | 67% | 2343 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,030 psi | 76% | 2352 fps | 99.3% |
| Ramshot Grand | <<locked>> | 92% | 41,814 psi | 81% | 2474 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,855 psi | 74% | 2346 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 92% | 37,086 psi | 72% | 2365 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 54% | 1440 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,189 psi | 76% | 2379 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,913 psi | 74% | 2392 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,374 psi | 67% | 2372 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 86% | 42,221 psi | 82% | 2382 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 37,014 psi | 72% | 2329 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 43,076 psi | 84% | 2365 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,105 psi | 82% | 2349 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 40,292 psi | 78% | 2336 fps | 97.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,075 psi | 80% | 2300 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,666 psi | 71% | 2323 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,520 psi | 69% | 2313 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,099 psi | 68% | 2260 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 80% | 40,654 psi | 79% | 2356 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 36,927 psi | 72% | 2293 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 39,943 psi | 78% | 2356 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,241 psi | 61% | 2224 fps | 98.1% |
| Vihtavuori N560 | <<locked>> | 90% | 42,902 psi | 83% | 2497 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 42,119 psi | 82% | 2477 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,479 psi | 77% | 2323 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,394 psi | 80% | 2408 fps | 98% |
| Winchester StaBALL HD | 39.7 gr | 80% | 24,845 psi | 48% | 2142 fps | 97.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,378 psi | 76% | 2349 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 57 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 155gr | Lapua Mega. Winchester StaBALL HD delivers the highest muzzle velocity at 2,644 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,644 fps. ADI AR 2225 gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.264" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Winchester StaBALL HD, Alliant Reloder-26, Bofors RP15 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 155gr | Lapua Mega 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.