Load Specifications
Load data in caliber 6.5-06 Ackley Improved with .264 | 123gr | Warner Tool Co. Flat Line bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Accurate High Country.
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 2495 | <<locked>> | 82% | 56,637 psi | 87% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,551 psi | 89% | 2946 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 2995 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 57,029 psi | 88% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,102 psi | 89% | 3045 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 57,392 psi | 88% | 3143 fps | 97.8% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3143 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 86% | 56,695 psi | 87% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,230 psi | 85% | 3031 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,608 psi | 87% | 3084 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,579 psi | 87% | 3094 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,361 psi | 85% | 3028 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,361 psi | 85% | 3028 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,827 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,856 psi | 89% | 3009 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,882 psi | 84% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,420 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,088 psi | 89% | 3074 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 3081 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,489 psi | 81% | 3005 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,774 psi | 70% | 2933 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,579 psi | 87% | 3153 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,126 psi | 79% | 2999 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 55,259 psi | 85% | 2953 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 3081 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 57,899 psi | 89% | 2992 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,506 psi | 85% | 2969 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,376 psi | 87% | 3038 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 56,115 psi | 86% | 2999 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 56,724 psi | 87% | 3025 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,724 psi | 86% | 3009 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,376 psi | 85% | 2966 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,797 psi | 87% | 3002 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,759 psi | 69% | 2963 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 56,985 psi | 88% | 3081 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 56% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,072 psi | 88% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,202 psi | 86% | 2943 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,448 psi | 85% | 2927 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 55,419 psi | 85% | 2969 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,970 psi | 86% | 2963 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 58,392 psi | 90% | 3035 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,869 psi | 86% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,044 psi | 89% | 3009 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,882 psi | 83% | 3051 fps | 96.9% |
| Lovex S060 | <<locked>> | 82% | 57,609 psi | 89% | 2927 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,463 psi | 87% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,391 psi | 87% | 2963 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 57,551 psi | 89% | 3002 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,615 psi | 72% | 2838 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 57,870 psi | 89% | 2949 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,479 psi | 90% | 2940 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,145 psi | 88% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,304 psi | 87% | 3022 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 55,405 psi | 85% | 3107 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 56,405 psi | 87% | 3025 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,392 psi | 90% | 3022 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,592 psi | 84% | 3074 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 55,303 psi | 85% | 3025 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,834 psi | 75% | 2943 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,086 psi | 57% | 1900 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,390 psi | 85% | 2953 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,869 psi | 86% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,928 psi | 89% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,260 psi | 87% | 3094 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,672 psi | 69% | 2956 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 84% | 58,450 psi | 90% | 2946 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,100 psi | 85% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,811 psi | 87% | 2999 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 98% | 57,508 psi | 89% | 3061 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 57,899 psi | 89% | 2992 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,391 psi | 87% | 2963 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,463 psi | 87% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,551 psi | 89% | 3002 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,884 psi | 88% | 3009 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,551 psi | 89% | 2979 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,276 psi | 90% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,028 psi | 86% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,941 psi | 86% | 2913 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,014 psi | 88% | 3058 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 58,262 psi | 90% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,581 psi | 90% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,187 psi | 85% | 2936 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 56,217 psi | 87% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,378 psi | 90% | 3038 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,288 psi | 85% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,680 psi | 86% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,521 psi | 87% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 58,711 psi | 90% | 3018 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,911 psi | 83% | 2953 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 57,421 psi | 88% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,943 psi | 89% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,998 psi | 85% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,622 psi | 86% | 3097 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 58,494 psi | 90% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,666 psi | 87% | 3045 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,109 psi | 74% | 3077 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,827 psi | 89% | 2986 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3035 fps | 98.6% |
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% | 53,171 psi | 82% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,415 psi | 78% | 2828 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 34,795 psi | 54% | 2589 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 50,401 psi | 78% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,624 psi | 59% | 2697 fps | 98.4% |
| Accurate High Country | 54.9 gr | 92% | 46,427 psi | 71% | 2946 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 96% | 50,734 psi | 78% | 3012 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,210 psi | 73% | 2805 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,612 psi | 66% | 2792 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 49,501 psi | 76% | 2956 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,446 psi | 81% | 3025 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,583 psi | 66% | 2789 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,583 psi | 66% | 2789 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,877 psi | 74% | 2828 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,198 psi | 79% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,463 psi | 58% | 2707 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,540 psi | 65% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,119 psi | 65% | 2779 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,583 psi | 66% | 2835 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,543 psi | 42% | 2451 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,228 psi | 51% | 2628 fps | 95.5% |
| Alliant Reloder-26 | 50.4 gr | 82% | 31,502 psi | 48% | 2621 fps | 95.6% |
| Bofors RP15 | <<locked>> | 94% | 42,003 psi | 65% | 2822 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,153 psi | 74% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,583 psi | 66% | 2835 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,351 psi | 65% | 2707 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,457 psi | 75% | 2851 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,306 psi | 62% | 2736 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,192 psi | 66% | 2759 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 94% | 49,574 psi | 76% | 2904 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,924 psi | 80% | 2946 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,027 psi | 54% | 2595 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,098 psi | 82% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,047 psi | 65% | 2897 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,305 psi | 60% | 2749 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 42% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,679 psi | 83% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,661 psi | 76% | 2838 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,909 psi | 80% | 2867 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 38,014 psi | 59% | 2631 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,758 psi | 67% | 2740 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 37,057 psi | 57% | 2644 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 52,518 psi | 81% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,445 psi | 79% | 2900 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 47,094 psi | 72% | 2923 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 54,244 psi | 83% | 2877 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,951 psi | 77% | 2835 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,423 psi | 64% | 2690 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,668 psi | 61% | 2671 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 33,779 psi | 52% | 2562 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 54,476 psi | 84% | 2900 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,013 psi | 85% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,589 psi | 78% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,946 psi | 66% | 2779 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 38,986 psi | 60% | 2785 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 38,319 psi | 59% | 2690 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 50,821 psi | 78% | 2907 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,152 psi | 73% | 2936 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,970 psi | 57% | 2667 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 41,959 psi | 65% | 2805 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 43% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,588 psi | 75% | 2835 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,165 psi | 70% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,174 psi | 59% | 2707 fps | 98% |
| ReloadSwiss RS 70 | 48.7 gr | 80% | 36,985 psi | 57% | 2713 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,928 psi | 60% | 2815 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 51,735 psi | 80% | 2848 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,585 psi | 70% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,847 psi | 72% | 2825 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 41,162 psi | 63% | 2762 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 42,351 psi | 65% | 2707 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,423 psi | 64% | 2690 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 49,951 psi | 77% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,668 psi | 61% | 2671 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,499 psi | 72% | 2838 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,925 psi | 83% | 2923 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,071 psi | 85% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,659 psi | 72% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,567 psi | 62% | 2635 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,801 psi | 67% | 2818 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 54,882 psi | 84% | 2825 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,788 psi | 70% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,401 psi | 79% | 2874 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 34,679 psi | 53% | 2641 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,276 psi | 60% | 2690 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 52,185 psi | 80% | 2812 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,388 psi | 81% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,801 psi | 67% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,740 psi | 61% | 2687 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,292 psi | 64% | 2726 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 50,357 psi | 78% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,986 psi | 60% | 2687 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,458 psi | 47% | 2530 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 94% | 48,428 psi | 75% | 2966 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,653 psi | 59% | 2651 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,524 psi | 62% | 2743 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,918 psi | 40% | 2477 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,099 psi | 83% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,266 psi | 68% | 2789 fps | 95.7% |
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 99 powders for 6.5-06 Ackley Improved loaded with the .264 | 123gr | Warner Tool Co. Flat Line. Alliant Reloder-26 delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,153 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 123.0 gr projectile in 0.264" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Accurate High Country rank at the top here: for 6.5-06 Ackley Improved with the .264 | 123gr | Warner Tool Co. Flat Line 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.