Load Specifications
Load data in caliber 6.5 Rem. SA Ultra Mag. with .264 | 122gr | Peregrine VLR-5 bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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 2495 | <<locked>> | 82% | 56,579 psi | 87% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,218 psi | 90% | 2992 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,855 psi | 87% | 3038 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 57,334 psi | 88% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,940 psi | 85% | 3031 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 58,798 psi | 90% | 3199 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 98% | 55,666 psi | 86% | 3130 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 86% | 57,696 psi | 89% | 3009 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,420 psi | 87% | 3084 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,885 psi | 89% | 3143 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,696 psi | 89% | 3140 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,521 psi | 87% | 3081 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,421 psi | 90% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,784 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,159 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,624 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,724 psi | 86% | 3071 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3133 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,998 psi | 83% | 3058 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,485 psi | 72% | 2982 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 58,392 psi | 90% | 3205 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,069 psi | 80% | 3051 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 55,666 psi | 86% | 2989 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3133 fps | 98.9% |
| Bofors RP7 | <<locked>> | 90% | 58,581 psi | 90% | 3035 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,079 psi | 71% | 2917 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,231 psi | 87% | 3015 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,363 psi | 88% | 3091 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 56,884 psi | 88% | 3048 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 98% | 58,059 psi | 89% | 3081 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,739 psi | 87% | 3061 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,449 psi | 87% | 3012 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,754 psi | 89% | 3048 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,643 psi | 70% | 3022 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 90% | 58,131 psi | 89% | 3133 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 56% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,870 psi | 89% | 3005 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,942 psi | 88% | 2986 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,043 psi | 86% | 2972 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 56,376 psi | 87% | 3018 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,768 psi | 87% | 3009 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 55,738 psi | 86% | 3025 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,536 psi | 87% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,680 psi | 86% | 3009 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,129 psi | 85% | 3110 fps | 97.6% |
| Lovex S060 | <<locked>> | 82% | 58,378 psi | 90% | 2969 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,043 psi | 88% | 2976 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,014 psi | 88% | 3005 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 58,349 psi | 90% | 3051 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,065 psi | 72% | 2877 fps | 99.1% |
| Norma 201 | <<locked>> | 82% | 58,160 psi | 89% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 84% | 58,044 psi | 89% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,493 psi | 88% | 3077 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 56,797 psi | 87% | 3163 fps | 99.7% |
| Norma URP | <<locked>> | 92% | 57,479 psi | 88% | 3071 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,448 psi | 85% | 3012 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,782 psi | 86% | 3130 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 56,449 psi | 87% | 3077 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,705 psi | 76% | 2992 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,086 psi | 57% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,086 psi | 86% | 2999 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,188 psi | 88% | 3107 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,245 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,812 psi | 89% | 3150 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,571 psi | 70% | 3012 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,564 psi | 85% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,840 psi | 86% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,972 psi | 89% | 3054 fps | 98% |
| Rottweil R 905 | <<locked>> | 98% | 58,653 psi | 90% | 3114 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 90% | 58,581 psi | 90% | 3035 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,014 psi | 88% | 3005 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 57,043 psi | 88% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,349 psi | 90% | 3051 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,682 psi | 89% | 3051 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,494 psi | 90% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,724 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,434 psi | 87% | 2953 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,160 psi | 89% | 3110 fps | 99% |
| Somchem S335 | <<locked>> | 82% | 58,537 psi | 90% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 55,883 psi | 86% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,927 psi | 86% | 2982 fps | 96.9% |
| Somchem S365 | <<locked>> | 94% | 57,290 psi | 88% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,463 psi | 85% | 3028 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,144 psi | 86% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,376 psi | 87% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,290 psi | 88% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,869 psi | 86% | 3012 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 3002 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 84% | 58,189 psi | 90% | 2959 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 58,769 psi | 90% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,086 psi | 86% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,927 psi | 88% | 3153 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,782 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,653 psi | 89% | 3094 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,821 psi | 77% | 3123 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,668 psi | 90% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,796 psi | 86% | 3025 fps | 98.5% |
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 2495 | <<locked>> | 80% | 53,113 psi | 82% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,155 psi | 79% | 2877 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 32,547 psi | 50% | 2562 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 50,401 psi | 78% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,667 psi | 59% | 2730 fps | 98.7% |
| Accurate High Country | 55.5 gr | 90% | 43,947 psi | 68% | 2927 fps | 95% |
| Accurate MAGPRO | <<locked>> | 96% | 51,909 psi | 80% | 3064 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,659 psi | 73% | 2844 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 43,134 psi | 66% | 2838 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 47,021 psi | 72% | 2946 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,519 psi | 82% | 3074 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,538 psi | 62% | 2776 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,211 psi | 74% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,576 psi | 79% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,782 psi | 58% | 2746 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,047 psi | 66% | 2874 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,656 psi | 66% | 2825 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,350 psi | 62% | 2815 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,485 psi | 42% | 2477 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,415 psi | 48% | 2608 fps | 95% |
| Alliant Reloder-26 | 52.1 gr | 82% | 31,662 psi | 49% | 2661 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 42,641 psi | 66% | 2864 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,588 psi | 75% | 2877 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,350 psi | 62% | 2815 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,554 psi | 65% | 2746 fps | 96.8% |
| Hodgdon H1000 | <<locked>> | 98% | 42,989 psi | 66% | 2848 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 48,936 psi | 75% | 2890 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,727 psi | 63% | 2779 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 43,714 psi | 67% | 2805 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 50,531 psi | 78% | 2956 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,400 psi | 76% | 2936 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,288 psi | 54% | 2631 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,751 psi | 83% | 2989 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,871 psi | 61% | 2881 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 39,972 psi | 61% | 2795 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 42% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,491 psi | 84% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,140 psi | 77% | 2877 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,518 psi | 81% | 2917 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 38,435 psi | 59% | 2674 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,077 psi | 68% | 2782 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 37,202 psi | 57% | 2680 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 52,910 psi | 81% | 2969 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,863 psi | 75% | 2887 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 96% | 47,993 psi | 74% | 2979 fps | 95.9% |
| Lovex S060 | <<locked>> | 80% | 54,737 psi | 84% | 2917 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,285 psi | 77% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,553 psi | 64% | 2730 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 39,755 psi | 61% | 2707 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 33,765 psi | 52% | 2592 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 54,766 psi | 84% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,923 psi | 78% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,555 psi | 67% | 2822 fps | 95.8% |
| Norma MRP | 53.1 gr | 86% | 36,883 psi | 57% | 2766 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 38,566 psi | 59% | 2726 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,648 psi | 79% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,643 psi | 69% | 2920 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 37,550 psi | 58% | 2713 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 39,755 psi | 61% | 2789 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 43% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,008 psi | 75% | 2877 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,774 psi | 70% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,711 psi | 60% | 2749 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,463 psi | 58% | 2759 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,651 psi | 56% | 2789 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 52,054 psi | 80% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,774 psi | 70% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,585 psi | 69% | 2815 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 41,945 psi | 65% | 2812 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,554 psi | 65% | 2746 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,553 psi | 64% | 2730 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 50,285 psi | 77% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,755 psi | 61% | 2707 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,326 psi | 73% | 2884 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,839 psi | 84% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,862 psi | 72% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,596 psi | 62% | 2667 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,597 psi | 64% | 2808 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 55,259 psi | 85% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,079 psi | 71% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,892 psi | 75% | 2864 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 35,099 psi | 54% | 2680 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 39,624 psi | 61% | 2730 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 52,446 psi | 81% | 2844 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,794 psi | 81% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,019 psi | 68% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,972 psi | 61% | 2726 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 39,073 psi | 60% | 2707 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,894 psi | 78% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,291 psi | 60% | 2723 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,472 psi | 47% | 2556 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 49,371 psi | 76% | 3018 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,117 psi | 60% | 2694 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,988 psi | 63% | 2785 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,221 psi | 37% | 2441 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,969 psi | 85% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,843 psi | 64% | 2772 fps | 95.4% |
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 97 powders for 6.5 Rem. SA Ultra Mag. loaded with the .264 | 122gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,205 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 122.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for 6.5 Rem. SA Ultra Mag. with the .264 | 122gr | Peregrine VLR-5 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.