Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 125gr | Peregrine Glider GRM bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Alliant Reloder-33 and Vihtavuori N570.
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>> | 88% | 57,682 psi | 89% | 3084 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,942 psi | 88% | 3192 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 55,317 psi | 85% | 3120 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 57,856 psi | 89% | 3199 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 56,811 psi | 87% | 3173 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,551 psi | 89% | 3294 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 55,651 psi | 86% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,798 psi | 90% | 3169 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,131 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,115 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,695 psi | 87% | 3166 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,898 psi | 88% | 3176 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,969 psi | 85% | 3189 fps | 97.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,433 psi | 84% | 3169 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,276 psi | 90% | 3153 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 57,551 psi | 89% | 3176 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 56,478 psi | 87% | 3179 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 58,131 psi | 89% | 3189 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 58,247 psi | 90% | 3196 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,710 psi | 87% | 3123 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,550 psi | 85% | 3107 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,492 psi | 85% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,912 psi | 86% | 3255 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 58% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,493 psi | 88% | 3097 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,146 psi | 89% | 3097 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,029 psi | 88% | 3104 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 56,130 psi | 86% | 3176 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,462 psi | 84% | 3159 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 55,796 psi | 86% | 3058 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,840 psi | 86% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 86% | 58,276 psi | 90% | 3205 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,493 psi | 88% | 3202 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 55,985 psi | 86% | 3127 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 60% | 2077 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,985 psi | 88% | 3241 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,173 psi | 86% | 3199 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 55,782 psi | 86% | 3091 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 58,407 psi | 90% | 3163 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,044 psi | 89% | 3156 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,159 psi | 88% | 3077 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 57,783 psi | 89% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,624 psi | 90% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,984 psi | 85% | 3054 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 58,131 psi | 89% | 3136 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 57,943 psi | 89% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,653 psi | 89% | 3205 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 58,711 psi | 90% | 3196 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 56,666 psi | 87% | 3205 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 58,044 psi | 89% | 3271 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,652 psi | 87% | 3182 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,853 psi | 84% | 3064 fps | 99.8% |
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 3100 | <<locked>> | 80% | 43,816 psi | 67% | 2844 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 45,963 psi | 71% | 2979 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 48,225 psi | 74% | 2989 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 43,453 psi | 67% | 2923 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 36,956 psi | 57% | 2762 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 96% | 49,240 psi | 76% | 3127 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 31,546 psi | 49% | 2651 fps | 96.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,153 psi | 74% | 2982 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,135 psi | 68% | 2927 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,772 psi | 66% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,057 psi | 57% | 2789 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,008 psi | 75% | 3045 fps | 100% |
| Alliant Reloder-33 | 82.7 gr | 92% | 47,065 psi | 72% | 3035 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,372 psi | 78% | 3091 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,877 psi | 74% | 2963 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,075 psi | 63% | 2854 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 36,985 psi | 57% | 2772 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,135 psi | 68% | 2927 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 34,998 psi | 54% | 2713 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 45,934 psi | 71% | 2923 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,194 psi | 70% | 2907 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,938 psi | 80% | 2972 fps | 100% |
| Hodgdon Retumbo | 66.6 gr | 80% | 36,129 psi | 56% | 2822 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,824 psi | 83% | 3038 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,346 psi | 84% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,862 psi | 72% | 2917 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 42,250 psi | 65% | 2904 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 38,363 psi | 59% | 2822 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 37,608 psi | 58% | 2707 fps | 98.8% |
| Norma 217 | <<locked>> | 86% | 33,707 psi | 52% | 2717 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 47,094 psi | 72% | 3005 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 42,438 psi | 65% | 2917 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 80% | 38,145 psi | 59% | 2779 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,037 psi | 45% | 1860 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,491 psi | 55% | 2795 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,118 psi | 63% | 2894 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 48,849 psi | 75% | 2963 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 47,732 psi | 73% | 2972 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,384 psi | 73% | 2966 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 49,951 psi | 77% | 2949 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 53,853 psi | 83% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,022 psi | 74% | 2943 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 41,989 psi | 65% | 2808 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 92% | 54,070 psi | 83% | 3064 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 47,413 psi | 73% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,746 psi | 72% | 2999 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 38,595 psi | 59% | 2789 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 86% | 42,134 psi | 65% | 2913 fps | 95.1% |
| Vihtavuori N570 | 79.5 gr | 92% | 50,009 psi | 77% | 3120 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,350 psi | 64% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,353 psi | 68% | 2867 fps | 98.5% |
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 59 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 125gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,294 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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. Hodgdon Retumbo, Alliant Reloder-33, Vihtavuori N570 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 125gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, 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.