Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 135gr | Peregrine Glider GRM bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 86% | 56,376 psi | 87% | 2966 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,868 psi | 84% | 3071 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 84% | 55,709 psi | 86% | 3077 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 57,783 psi | 89% | 3061 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,565 psi | 87% | 3077 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 55,622 psi | 86% | 3058 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 56,217 psi | 87% | 3182 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 54,897 psi | 84% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,377 psi | 88% | 3048 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,956 psi | 88% | 3068 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,158 psi | 85% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,825 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,767 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,233 psi | 90% | 3156 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 3143 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,956 psi | 88% | 3038 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 56,405 psi | 87% | 3061 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,434 psi | 85% | 3064 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,956 psi | 88% | 3068 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,246 psi | 88% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,317 psi | 85% | 3009 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,102 psi | 89% | 3051 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,812 psi | 89% | 2956 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,317 psi | 85% | 3140 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 58% | 1955 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,521 psi | 85% | 2982 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 54,998 psi | 85% | 3058 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,638 psi | 89% | 3117 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 58,291 psi | 90% | 2995 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,129 psi | 85% | 3077 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,188 psi | 88% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,492 psi | 87% | 3087 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 54,578 psi | 84% | 3005 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 60% | 2005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,043 psi | 86% | 3123 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,027 psi | 85% | 3084 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 58,059 psi | 89% | 3028 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 57,000 psi | 88% | 3041 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,623 psi | 87% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,622 psi | 86% | 2959 fps | 99.5% |
| Somchem S385 | <<locked>> | 84% | 57,232 psi | 88% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,319 psi | 88% | 2995 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,652 psi | 87% | 3022 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 84% | 56,666 psi | 87% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,550 psi | 87% | 3091 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 57,566 psi | 89% | 3084 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 55,521 psi | 85% | 3091 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 57,029 psi | 88% | 3156 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,724 psi | 86% | 3061 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,217 psi | 88% | 3005 fps | 100% |
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% | 45,963 psi | 71% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,894 psi | 78% | 2999 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 48,225 psi | 74% | 2936 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 50,386 psi | 78% | 2933 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 45,658 psi | 70% | 2877 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 33,881 psi | 52% | 2602 fps | 95% |
| ADI AR 2218 | 80.3 gr | 92% | 44,672 psi | 69% | 2936 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,024 psi | 48% | 2556 fps | 96.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,256 psi | 77% | 2927 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,340 psi | 71% | 2881 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,136 psi | 69% | 2812 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,204 psi | 60% | 2746 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,619 psi | 79% | 2992 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 46,151 psi | 71% | 2927 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,093 psi | 71% | 2917 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,714 psi | 67% | 2789 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 43,120 psi | 66% | 2812 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 36,521 psi | 56% | 2677 fps | 96.2% |
| Bofors RP5 | <<locked>> | 80% | 46,340 psi | 71% | 2881 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 36,854 psi | 57% | 2680 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 48,037 psi | 74% | 2874 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,253 psi | 73% | 2861 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,346 psi | 84% | 2910 fps | 100% |
| Hodgdon Retumbo | 65.9 gr | 80% | 38,247 psi | 59% | 2795 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1752 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,718 psi | 75% | 2864 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 44,512 psi | 69% | 2861 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,462 psi | 55% | 2664 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 39,436 psi | 61% | 2661 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 31,009 psi | 48% | 2556 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 49,400 psi | 76% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,962 psi | 69% | 2877 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 40,248 psi | 62% | 2740 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 45% | 1791 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,782 psi | 58% | 2769 fps | 99.2% |
| ReloadSwiss RS 80 | 74.7 gr | 84% | 40,408 psi | 62% | 2792 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 51,039 psi | 79% | 2910 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 49,893 psi | 77% | 2917 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,588 psi | 76% | 2913 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 52,083 psi | 80% | 2900 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 50,154 psi | 77% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,947 psi | 68% | 2762 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 49,414 psi | 76% | 2890 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,676 psi | 76% | 2887 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,936 psi | 75% | 2953 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 40,727 psi | 63% | 2756 fps | 96.9% |
| Vihtavuori N568 | <<locked>> | 84% | 41,437 psi | 64% | 2808 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 88% | 45,818 psi | 71% | 2940 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,222 psi | 68% | 2871 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,441 psi | 71% | 2822 fps | 99.4% |
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 50 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 135gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,182 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 50 of the 50 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 135.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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, ADI AR 2218, ReloadSwiss RS 80 rank at the top here: for 6.5-300 Weatherby Mag. 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.