Load Specifications
Load data in caliber 6.5 x 58 mm Mauser Port. with .264 | 135gr | Peregrine Glider GRM bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 46,514 psi | 90% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,759 psi | 89% | 2520 fps | 96.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,888 psi | 85% | 2585 fps | 97.6% |
| Accurate 4064 | <<locked>> | 82% | 43,976 psi | 85% | 2526 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 46,485 psi | 90% | 2644 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 84% | 45,571 psi | 89% | 2552 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 46,485 psi | 90% | 2697 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 45,542 psi | 88% | 2575 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 45,759 psi | 89% | 2589 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 45,585 psi | 89% | 2661 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 45,774 psi | 89% | 2684 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,032 psi | 82% | 2618 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 44,034 psi | 86% | 2723 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 45,382 psi | 88% | 2582 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 46,035 psi | 89% | 2559 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 84% | 46,514 psi | 90% | 2595 fps | 99% |
| Hodgdon H414 | <<locked>> | 90% | 46,296 psi | 90% | 2648 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 45,165 psi | 88% | 2598 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 90% | 45,876 psi | 89% | 2667 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 69% | 1650 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 45,237 psi | 88% | 2539 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 46,470 psi | 90% | 2589 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,063 psi | 88% | 2543 fps | 96.7% |
| IMR 4831 | <<locked>> | 92% | 44,657 psi | 87% | 2598 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 44,860 psi | 87% | 2533 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 44,556 psi | 87% | 2539 fps | 98% |
| Lovex S070 | <<locked>> | 90% | 45,136 psi | 88% | 2569 fps | 97.1% |
| Norma 203B | <<locked>> | 82% | 45,078 psi | 88% | 2575 fps | 99.7% |
| Norma MRP | <<locked>> | 98% | 44,005 psi | 85% | 2680 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 46,383 psi | 90% | 2644 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 82% | 45,063 psi | 88% | 2595 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 92% | 45,194 psi | 88% | 2635 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 71% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,656 psi | 85% | 2523 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 45,368 psi | 88% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 46,398 psi | 90% | 2671 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 45,788 psi | 89% | 2687 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 86% | 45,600 psi | 89% | 2579 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 46,035 psi | 89% | 2559 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,556 psi | 87% | 2539 fps | 98% |
| Shooters World Precision | <<locked>> | 82% | 44,860 psi | 87% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 45,136 psi | 88% | 2569 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,251 psi | 86% | 2585 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 45,194 psi | 88% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,961 psi | 85% | 2487 fps | 96.6% |
| Somchem S355 | <<locked>> | 86% | 46,238 psi | 90% | 2582 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 44,498 psi | 86% | 2648 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 44,092 psi | 86% | 2582 fps | 96% |
| Vihtavuori N150 | <<locked>> | 86% | 44,222 psi | 86% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 45,223 psi | 88% | 2585 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 45,440 psi | 88% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 44,454 psi | 86% | 2592 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,572 psi | 90% | 2690 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 44,976 psi | 87% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 46,296 psi | 90% | 2648 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,405 psi | 73% | 2635 fps | 99.9% |
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 2495 | <<locked>> | 80% | 43,758 psi | 85% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,946 psi | 83% | 2467 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 35,563 psi | 69% | 2425 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,437 psi | 80% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,414 psi | 59% | 2316 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 40,335 psi | 78% | 2454 fps | 98.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,526 psi | 85% | 2641 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,914 psi | 78% | 2474 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,873 psi | 83% | 2536 fps | 99.2% |
| Alliant Reloder-16 | 35.1 gr | 80% | 31,024 psi | 60% | 2336 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,650 psi | 67% | 2454 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,861 psi | 52% | 2247 fps | 95% |
| Alliant Reloder-26 | 43.6 gr | 90% | 32,982 psi | 64% | 2474 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 39,639 psi | 77% | 2477 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 43,149 psi | 84% | 2507 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 40,466 psi | 79% | 2487 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 40,335 psi | 78% | 2533 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,485 psi | 55% | 2244 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 88% | 42,685 psi | 83% | 2605 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 51% | 1470 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,380 psi | 82% | 2487 fps | 99.2% |
| IMR 4350 | <<locked>> | 88% | 40,886 psi | 79% | 2487 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,711 psi | 77% | 2438 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 31,879 psi | 62% | 2336 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 42,322 psi | 82% | 2490 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,708 psi | 67% | 2339 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 39,697 psi | 77% | 2467 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 42,250 psi | 82% | 2523 fps | 99.4% |
| Norma MRP | <<locked>> | 96% | 40,886 psi | 79% | 2618 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 30,922 psi | 60% | 2320 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 42,206 psi | 82% | 2543 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 36,985 psi | 72% | 2470 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 52% | 1509 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,959 psi | 80% | 2474 fps | 96.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,912 psi | 72% | 2516 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,605 psi | 63% | 2392 fps | 95.6% |
| ReloadSwiss RS 70 | 40.3 gr | 84% | 34,838 psi | 68% | 2451 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,231 psi | 72% | 2425 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 43,149 psi | 84% | 2507 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,708 psi | 67% | 2339 fps | 95.2% |
| Shooters World Precision | <<locked>> | 80% | 42,322 psi | 82% | 2490 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 39,697 psi | 77% | 2467 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,522 psi | 75% | 2477 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,813 psi | 77% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,537 psi | 75% | 2385 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 38,261 psi | 74% | 2434 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 27,615 psi | 54% | 2274 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 41,263 psi | 80% | 2530 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 36,201 psi | 70% | 2369 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 32,300 psi | 63% | 2326 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 42,612 psi | 83% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,807 psi | 62% | 2326 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 28,964 psi | 56% | 2320 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,111 psi | 62% | 2306 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 40,625 psi | 79% | 2539 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,919 psi | 52% | 2323 fps | 95.5% |
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 56 powders for 6.5 x 58 mm Mauser Port. loaded with the .264 | 135gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 2,723 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,723 fps. Accurate 3100 gives the best case fill at 100 %, and 56 of the 56 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Hodgdon TrailBoss 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 Reloder-26, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for 6.5 x 58 mm Mauser Port. with the .264 | 135gr | Peregrine Glider GRM 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.