Load Specifications
Load data in caliber .26 Nosler with .263 | 139gr | Prvi Partizan SP BT bullet and 27 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Alliant Reloder-50 and Norma 217.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 8700 | <<locked>> | 96% | 56,043 psi | 86% | 3018 fps | 98.3% |
| ADI AR 2217 | <<locked>> | 88% | 57,914 psi | 89% | 3041 fps | 100% |
| ADI AR 2218 | <<locked>> | 90% | 55,100 psi | 85% | 3117 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 88% | 55,463 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 58,668 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 58,233 psi | 90% | 3110 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 90% | 56,898 psi | 88% | 3074 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 56,449 psi | 87% | 2989 fps | 98.9% |
| Bofors RP15 | <<locked>> | 82% | 58,639 psi | 90% | 3041 fps | 100% |
| Bofors RP30 | <<locked>> | 84% | 56,028 psi | 86% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 55,506 psi | 85% | 3002 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 58,755 psi | 90% | 3136 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,740 psi | 60% | 1962 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 86% | 57,725 psi | 89% | 2953 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 55,622 psi | 86% | 3028 fps | 100% |
| Lovex S071 | <<locked>> | 82% | 55,985 psi | 86% | 2897 fps | 100% |
| Norma 217 | <<locked>> | 90% | 57,421 psi | 88% | 3054 fps | 100% |
| Ramshot Magnum | <<locked>> | 82% | 57,638 psi | 89% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 40,016 psi | 62% | 2008 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 55,999 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 55,796 psi | 86% | 3048 fps | 99.7% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 58,088 psi | 89% | 3031 fps | 98.3% |
| Vihtavuori 20N29 | <<locked>> | 98% | 55,956 psi | 86% | 3012 fps | 96.5% |
| Vihtavuori N170 | <<locked>> | 84% | 55,753 psi | 86% | 2959 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 82% | 57,754 psi | 89% | 3031 fps | 100% |
| Vihtavuori N568 | <<locked>> | 84% | 55,724 psi | 86% | 3045 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 86% | 57,174 psi | 88% | 3114 fps | 98.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 8700 | <<locked>> | 88% | 43,700 psi | 67% | 2782 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 80% | 45,368 psi | 70% | 2822 fps | 99.3% |
| ADI AR 2218 | 75.2 gr | 82% | 42,844 psi | 66% | 2854 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 43,352 psi | 67% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 52,170 psi | 80% | 2933 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 45,208 psi | 70% | 2858 fps | 96.3% |
| Alliant Reloder-50 | 76.3 gr | 82% | 44,541 psi | 69% | 2835 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 53,243 psi | 82% | 2933 fps | 98.5% |
| Bofors RP15 | <<locked>> | 80% | 55,390 psi | 85% | 2989 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 49,951 psi | 77% | 2913 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 48,892 psi | 75% | 2887 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 51,735 psi | 80% | 3022 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 29,327 psi | 45% | 1755 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 51,445 psi | 79% | 2841 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 41,785 psi | 64% | 2762 fps | 98.6% |
| Lovex S071 | <<locked>> | 80% | 53,040 psi | 82% | 2851 fps | 100% |
| Norma 217 | 67.8 gr | 80% | 42,917 psi | 66% | 2792 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 54,128 psi | 83% | 2943 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 30,356 psi | 47% | 1801 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 52,286 psi | 80% | 3009 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 49,197 psi | 76% | 2927 fps | 99% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 46,093 psi | 71% | 2808 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 52,620 psi | 81% | 2956 fps | 95.7% |
| Vihtavuori N170 | <<locked>> | 80% | 49,792 psi | 77% | 2848 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 80% | 54,418 psi | 84% | 2976 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 49,298 psi | 76% | 2923 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 80% | 47,703 psi | 73% | 2930 fps | 96.6% |
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 27 powders for .26 Nosler loaded with the .263 | 139gr | Prvi Partizan SP BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,136 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 27 of the 27 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.263" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Alliant Reloder-50, Norma 217 rank at the top here: for .26 Nosler with the .263 | 139gr | Prvi Partizan SP 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.