Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .263 | 140gr | Prvi Partizan PSP bullet and 47 powders. The key underlying parameters are shown in the table above.
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 3100 | <<locked>> | 84% | 58,131 psi | 89% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,244 psi | 83% | 2982 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 82% | 57,406 psi | 88% | 3051 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 84% | 57,740 psi | 89% | 3045 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,537 psi | 89% | 3031 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 58,566 psi | 90% | 3173 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 57,450 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 58,189 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 58,305 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,753 psi | 87% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,827 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,289 psi | 87% | 3068 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,782 psi | 87% | 3068 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,769 psi | 89% | 3009 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 57,943 psi | 89% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,696 psi | 89% | 3048 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 58,305 psi | 90% | 3038 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,955 psi | 85% | 2989 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,289 psi | 87% | 2976 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,216 psi | 85% | 2956 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,783 psi | 89% | 3117 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,159 psi | 59% | 1942 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,246 psi | 87% | 2949 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 56,579 psi | 87% | 3031 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 58,465 psi | 90% | 2963 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,391 psi | 87% | 3041 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,594 psi | 87% | 2917 fps | 100% |
| Norma 217 | <<locked>> | 96% | 58,204 psi | 90% | 3064 fps | 100% |
| Norma MRP | <<locked>> | 82% | 58,697 psi | 90% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,044 psi | 89% | 3054 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,463 psi | 87% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,131 psi | 60% | 1985 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 58,624 psi | 90% | 3100 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,580 psi | 89% | 3074 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 58,247 psi | 90% | 3005 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,028 psi | 86% | 2992 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,885 psi | 89% | 3002 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 58,450 psi | 90% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,755 psi | 90% | 2966 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 58,146 psi | 89% | 3002 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 82% | 58,421 psi | 90% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,885 psi | 89% | 3058 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 55,738 psi | 86% | 2999 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,711 psi | 89% | 3074 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 55,405 psi | 85% | 3077 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 58,392 psi | 90% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 58,334 psi | 90% | 2972 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,778 psi | 78% | 2825 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 46,905 psi | 72% | 2848 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 53,345 psi | 82% | 2982 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 50,372 psi | 78% | 2920 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 37,811 psi | 58% | 2657 fps | 97.4% |
| ADI AR 2218 | <<locked>> | 88% | 43,439 psi | 67% | 2867 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 35,157 psi | 54% | 2625 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,578 psi | 84% | 2953 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,097 psi | 79% | 2917 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,908 psi | 77% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,048 psi | 68% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 45,150 psi | 69% | 2854 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 90% | 45,426 psi | 70% | 2848 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,384 psi | 73% | 2818 fps | 97.1% |
| Bofors RP15 | <<locked>> | 80% | 47,572 psi | 73% | 2851 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 41,046 psi | 63% | 2733 fps | 98.2% |
| Bofors RP5 | <<locked>> | 80% | 51,097 psi | 79% | 2917 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 41,205 psi | 63% | 2733 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 80% | 52,475 psi | 81% | 2910 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,663 psi | 80% | 2897 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,221 psi | 67% | 2854 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 44% | 1736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,794 psi | 81% | 2890 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 49,153 psi | 76% | 2900 fps | 99.4% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,027 psi | 85% | 2907 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 82% | 35,070 psi | 54% | 2602 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 43,874 psi | 68% | 2700 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,330 psi | 51% | 2566 fps | 97.4% |
| Norma MRP | <<locked>> | 80% | 54,708 psi | 84% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,183 psi | 77% | 2927 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 45,252 psi | 70% | 2789 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,559 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,989 psi | 66% | 2828 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,508 psi | 61% | 2717 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 54,549 psi | 84% | 2946 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,527 psi | 70% | 2795 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,201 psi | 83% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,810 psi | 84% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 48,167 psi | 74% | 2792 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 47,630 psi | 73% | 2808 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 54,752 psi | 84% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,998 psi | 83% | 2992 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 45,455 psi | 70% | 2808 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 80% | 40,538 psi | 62% | 2740 fps | 96% |
| Vihtavuori N570 | <<locked>> | 84% | 44,744 psi | 69% | 2864 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,401 psi | 78% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,894 psi | 78% | 2854 fps | 99.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 54 powders for 6.5-300 Weatherby Mag. loaded with the .263 | 140gr | Prvi Partizan PSP. ADI AR 2218 delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,173 fps. Accurate 8700 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.263" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. As outliers, Hodgdon 50BMG, Hodgdon US 869, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.