Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 120gr | Peregrine Glider (Glider GRM) bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 56,637 psi | 87% | 3123 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 58,769 psi | 90% | 3287 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 86% | 55,753 psi | 86% | 3225 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 86% | 58,102 psi | 89% | 3219 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,739 psi | 87% | 3228 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 55,492 psi | 85% | 3202 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,217 psi | 87% | 3317 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,523 psi | 90% | 3287 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,291 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,624 psi | 89% | 3205 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,058 psi | 88% | 3225 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,769 psi | 90% | 3186 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,463 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,637 psi | 86% | 3212 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,928 psi | 89% | 3291 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,261 psi | 88% | 3186 fps | 97.7% |
| Bofors RP15 | <<locked>> | 90% | 56,246 psi | 87% | 3209 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,216 psi | 85% | 3209 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 57,058 psi | 88% | 3225 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 57,145 psi | 88% | 3228 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,521 psi | 85% | 3156 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,523 psi | 90% | 3209 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,117 psi | 89% | 3120 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,697 psi | 90% | 3356 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 58% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,507 psi | 87% | 3136 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,087 psi | 88% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,999 psi | 86% | 3140 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 55,013 psi | 85% | 3209 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,287 psi | 82% | 3189 fps | 99.2% |
| Lovex S070 | <<locked>> | 82% | 58,537 psi | 90% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,276 psi | 90% | 3146 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,943 psi | 89% | 3196 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 3215 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,087 psi | 88% | 3238 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,711 psi | 90% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,202 psi | 86% | 3232 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 57,885 psi | 89% | 3192 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,650 psi | 84% | 3153 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 59% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,622 psi | 86% | 3274 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,650 psi | 84% | 3222 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 86% | 58,566 psi | 90% | 3186 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,188 psi | 88% | 3192 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 82% | 58,537 psi | 90% | 3163 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,840 psi | 87% | 3189 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,260 psi | 87% | 3110 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 56,594 psi | 87% | 3130 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,638 psi | 89% | 3163 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,595 psi | 89% | 3146 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,695 psi | 87% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,550 psi | 87% | 3238 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 57,435 psi | 88% | 3228 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 55,245 psi | 85% | 3228 fps | 98.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,536 psi | 87% | 3294 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,172 psi | 85% | 3215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,551 psi | 89% | 3159 fps | 99.9% |
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% | 42,888 psi | 66% | 2871 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 47,456 psi | 73% | 3071 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 80% | 44,875 psi | 69% | 3005 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 47,297 psi | 73% | 3018 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 42,525 psi | 65% | 2946 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 38,827 psi | 60% | 2854 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 51,996 psi | 80% | 3228 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 82% | 30,792 psi | 47% | 2664 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,346 psi | 84% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,224 psi | 73% | 3012 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,163 psi | 66% | 2953 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,843 psi | 64% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,158 psi | 56% | 2808 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,703 psi | 73% | 3071 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,429 psi | 76% | 3133 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,905 psi | 72% | 2986 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 40,190 psi | 62% | 2881 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 38,798 psi | 60% | 2864 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 43,163 psi | 66% | 2953 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 36,796 psi | 57% | 2805 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,005 psi | 69% | 2949 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,280 psi | 68% | 2933 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,995 psi | 78% | 3012 fps | 100% |
| Hodgdon Retumbo | 67.2 gr | 80% | 35,244 psi | 54% | 2841 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 43% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,924 psi | 81% | 3074 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,345 psi | 82% | 3077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,050 psi | 71% | 2946 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 41,278 psi | 64% | 2927 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 40,118 psi | 62% | 2907 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 55,027 psi | 85% | 3107 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,695 psi | 56% | 2730 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 54,114 psi | 83% | 3130 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,692 psi | 50% | 2730 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 45,992 psi | 71% | 3031 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 55,100 psi | 85% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,307 psi | 64% | 2936 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 54,157 psi | 83% | 3130 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,130 psi | 57% | 2795 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1896 fps | 100% |
| ReloadSwiss RS 76 | 72 gr | 80% | 34,650 psi | 53% | 2812 fps | 97% |
| ReloadSwiss RS 80 | 79.8 gr | 88% | 43,279 psi | 67% | 2989 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 47,993 psi | 74% | 2992 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,775 psi | 72% | 2999 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 80% | 55,027 psi | 85% | 3107 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,441 psi | 71% | 2995 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 48,994 psi | 75% | 2979 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 52,736 psi | 81% | 3068 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,065 psi | 72% | 2972 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 80% | 41,133 psi | 63% | 2838 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 46,427 psi | 71% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,687 psi | 70% | 3022 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 40,437 psi | 62% | 2881 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 44,411 psi | 68% | 3009 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 52,576 psi | 81% | 3219 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,292 psi | 62% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,424 psi | 67% | 2894 fps | 98% |
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 6.5-300 Weatherby Mag. loaded with the .264 | 120gr | Peregrine Glider (Glider GRM). Hodgdon Retumbo delivers the highest muzzle velocity at 3,356 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,356 fps. ADI AR 2218 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 (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.264" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 120gr | Peregrine Glider (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.