Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 108gr | Lapua Scenar bullet and 62 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 IMR 7828 SSC.
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>> | 90% | 58,653 psi | 90% | 3284 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,638 psi | 89% | 3383 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 86% | 55,999 psi | 86% | 3314 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 90% | 58,305 psi | 90% | 3389 fps | 99% |
| ADI AR 2217 | <<locked>> | 98% | 57,000 psi | 88% | 3356 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 3373 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,231 psi | 87% | 3310 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,057 psi | 86% | 3314 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,622 psi | 86% | 3304 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,624 psi | 90% | 3383 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,492 psi | 87% | 3291 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,956 psi | 88% | 3363 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,551 psi | 89% | 3383 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,230 psi | 85% | 3271 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 57,783 psi | 89% | 3366 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 56,753 psi | 87% | 3363 fps | 99.2% |
| Bofors RP5 | <<locked>> | 90% | 58,624 psi | 90% | 3383 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 96% | 58,653 psi | 90% | 3383 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 57,479 psi | 88% | 3317 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,347 psi | 87% | 3297 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,275 psi | 87% | 3232 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,767 psi | 86% | 3442 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 58% | 2172 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,305 psi | 90% | 3297 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,216 psi | 85% | 3241 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,841 psi | 89% | 3297 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,507 psi | 87% | 3366 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,821 psi | 78% | 3264 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 58,421 psi | 90% | 3274 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,782 psi | 87% | 3271 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,608 psi | 87% | 3251 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,999 psi | 86% | 3294 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 51,880 psi | 80% | 3297 fps | 99.7% |
| Norma MRP | <<locked>> | 86% | 54,940 psi | 85% | 3333 fps | 99.9% |
| Norma URP | <<locked>> | 82% | 56,753 psi | 87% | 3291 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,783 psi | 89% | 3392 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 55,985 psi | 86% | 3294 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,463 psi | 87% | 3310 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 59% | 2224 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,725 psi | 89% | 3360 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,145 psi | 88% | 3432 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,492 psi | 87% | 3379 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 86% | 56,681 psi | 87% | 3284 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 86% | 55,201 psi | 85% | 3291 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,421 psi | 90% | 3274 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,782 psi | 87% | 3271 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,566 psi | 89% | 3225 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,653 psi | 90% | 3350 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 58,421 psi | 90% | 3271 fps | 98.6% |
| Somchem S365 | <<locked>> | 84% | 58,320 psi | 90% | 3297 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,767 psi | 86% | 3261 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 58,392 psi | 90% | 3284 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,709 psi | 86% | 3245 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 57,667 psi | 89% | 3281 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,407 psi | 90% | 3320 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,247 psi | 90% | 3399 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 92% | 55,303 psi | 85% | 3314 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 96% | 56,956 psi | 88% | 3386 fps | 97.8% |
| Vihtavuori N570 | <<locked>> | 98% | 58,146 psi | 89% | 3448 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,117 psi | 89% | 3222 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,507 psi | 87% | 3379 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,651 psi | 86% | 3255 fps | 99.4% |
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% | 41,669 psi | 64% | 2963 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 82% | 46,499 psi | 72% | 3159 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 45,585 psi | 70% | 3107 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 44,063 psi | 68% | 3104 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 40,190 psi | 62% | 2999 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 34,258 psi | 53% | 2877 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,006 psi | 71% | 3107 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,330 psi | 81% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,585 psi | 70% | 3100 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,582 psi | 64% | 3035 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,306 psi | 62% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,809 psi | 54% | 2887 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,730 psi | 70% | 3163 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 51,866 psi | 80% | 3205 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,798 psi | 60% | 2959 fps | 95.3% |
| Bofors RP30 | <<locked>> | 86% | 40,103 psi | 62% | 3012 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 41,582 psi | 64% | 3035 fps | 96.5% |
| Hodgdon H1000 | <<locked>> | 86% | 40,959 psi | 63% | 3022 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 43,613 psi | 67% | 3038 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 45,948 psi | 71% | 3091 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,313 psi | 76% | 3117 fps | 100% |
| Hodgdon Retumbo | 70 gr | 82% | 36,521 psi | 56% | 2989 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1949 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,227 psi | 79% | 3169 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 51,866 psi | 80% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,643 psi | 69% | 3031 fps | 95.8% |
| IMR 7828 SSC | 69.9 gr | 82% | 42,569 psi | 66% | 3077 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 41,379 psi | 64% | 3058 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 54,810 psi | 84% | 3215 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,432 psi | 82% | 3209 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 35,810 psi | 55% | 2818 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 52,156 psi | 80% | 3222 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 36,201 psi | 56% | 2943 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 44,324 psi | 68% | 3120 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 53,287 psi | 82% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 42,685 psi | 66% | 3084 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 52,228 psi | 80% | 3225 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 35,694 psi | 55% | 2871 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 44% | 1991 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,664 psi | 83% | 3294 fps | 100% |
| ReloadSwiss RS 76 | 74.9 gr | 82% | 35,984 psi | 55% | 2956 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 44,817 psi | 69% | 3140 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 46,441 psi | 71% | 3081 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,179 psi | 70% | 3087 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,810 psi | 84% | 3215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,432 psi | 82% | 3209 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,896 psi | 83% | 3159 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,831 psi | 69% | 3081 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 47,572 psi | 73% | 3068 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 50,821 psi | 78% | 3176 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,571 psi | 70% | 3064 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 54,650 psi | 84% | 3222 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,798 psi | 61% | 2920 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 54,085 psi | 83% | 3225 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,933 psi | 69% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,048 psi | 68% | 3107 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 45,005 psi | 69% | 3100 fps | 96% |
| Vihtavuori N568 | <<locked>> | 92% | 49,168 psi | 76% | 3232 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 53,940 psi | 83% | 3366 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,273 psi | 84% | 3166 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,159 psi | 59% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,119 psi | 65% | 2982 fps | 96.7% |
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 62 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 108gr | Lapua Scenar. Vihtavuori N570 delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,448 fps. ADI AR 2225 gives the best case fill at 100 %, and 62 of the 62 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 108.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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, ReloadSwiss RS 76, IMR 7828 SSC rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 108gr | Lapua Scenar 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.