Load Specifications
Load data in caliber 6.5-06 A-Square with .264 | 123gr | Sierra MatchKing 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 Hodgdon Superformance.
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% | 55,492 psi | 85% | 2841 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,753 psi | 87% | 2913 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,665 psi | 84% | 2953 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 55,883 psi | 86% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,782 psi | 87% | 3009 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,130 psi | 88% | 3100 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 82% | 58,160 psi | 89% | 2976 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,753 psi | 86% | 2927 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,769 psi | 89% | 3051 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 3041 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,187 psi | 85% | 3051 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,840 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,855 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,537 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,085 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,072 psi | 88% | 3038 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 3038 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,358 psi | 79% | 2972 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,628 psi | 69% | 2890 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,100 psi | 85% | 3110 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 58,334 psi | 90% | 2995 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,777 psi | 77% | 2956 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 57,812 psi | 89% | 2972 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 3038 fps | 98% |
| Bofors RP7 | <<locked>> | 90% | 57,072 psi | 88% | 2956 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 58,088 psi | 89% | 2989 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,187 psi | 85% | 3002 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 58,769 psi | 90% | 3022 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 98% | 55,405 psi | 85% | 2982 fps | 96.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 58,102 psi | 89% | 3028 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,769 psi | 89% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,753 psi | 86% | 2972 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,564 psi | 85% | 3041 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 56% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,405 psi | 87% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,726 psi | 90% | 2963 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,986 psi | 89% | 2949 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 58,131 psi | 89% | 2989 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,624 psi | 90% | 2982 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 57,159 psi | 88% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 58,363 psi | 90% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,101 psi | 88% | 2976 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,924 psi | 81% | 3015 fps | 96.3% |
| Lovex S060 | <<locked>> | 82% | 56,927 psi | 88% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,724 psi | 86% | 2907 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 58,711 psi | 90% | 2979 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 56,710 psi | 87% | 2969 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,527 psi | 70% | 2802 fps | 98.4% |
| Norma 201 | <<locked>> | 82% | 56,840 psi | 87% | 2917 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,740 psi | 89% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,144 psi | 86% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,216 psi | 85% | 2986 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 58,088 psi | 89% | 3130 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 55,506 psi | 85% | 2992 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,130 psi | 88% | 2989 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,272 psi | 82% | 3031 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 58,015 psi | 89% | 3048 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,413 psi | 73% | 2894 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 57% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,972 psi | 89% | 2972 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 58,131 psi | 89% | 3048 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 58,566 psi | 90% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,724 psi | 87% | 3031 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,143 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2910 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 84% | 57,421 psi | 88% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,667 psi | 89% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,782 psi | 86% | 2963 fps | 97% |
| Rottweil R 905 | <<locked>> | 98% | 56,347 psi | 87% | 3025 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 57,072 psi | 88% | 2956 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 58,711 psi | 90% | 2979 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,724 psi | 86% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,710 psi | 87% | 2969 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,651 psi | 86% | 2972 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,623 psi | 87% | 2946 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,508 psi | 88% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,610 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 58,508 psi | 90% | 2930 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,927 psi | 86% | 3018 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 57,246 psi | 88% | 2841 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,595 psi | 89% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,769 psi | 89% | 2956 fps | 96.5% |
| Somchem S365 | <<locked>> | 96% | 58,682 psi | 90% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,029 psi | 88% | 2999 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 58,059 psi | 89% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 58,044 psi | 89% | 2874 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 58,160 psi | 89% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,288 psi | 85% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,493 psi | 88% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,591 psi | 81% | 2913 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 56,492 psi | 87% | 2887 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,536 psi | 87% | 2989 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,377 psi | 88% | 3051 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 58,276 psi | 90% | 3120 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,493 psi | 88% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,550 psi | 85% | 3009 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,340 psi | 71% | 3028 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,869 psi | 87% | 2953 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 2995 fps | 98.2% |
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% | 52,025 psi | 80% | 2792 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,588 psi | 76% | 2795 fps | 97.6% |
| Accurate 3100 | <<locked>> | 86% | 33,997 psi | 52% | 2552 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 49,284 psi | 76% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,666 psi | 58% | 2657 fps | 98% |
| Accurate MAGPRO | <<locked>> | 98% | 53,142 psi | 82% | 3035 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 54,694 psi | 84% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,514 psi | 72% | 2772 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 44,382 psi | 68% | 2808 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 48,559 psi | 75% | 2917 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,372 psi | 79% | 2989 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,123 psi | 72% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,212 psi | 77% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,579 psi | 56% | 2667 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,626 psi | 64% | 2799 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,034 psi | 68% | 2802 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,367 psi | 68% | 2854 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,876 psi | 41% | 2408 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,534 psi | 53% | 2648 fps | 95.7% |
| Alliant Reloder-26 | 50.7 gr | 84% | 33,083 psi | 51% | 2651 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,607 psi | 84% | 2940 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 43,758 psi | 67% | 2838 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 47,427 psi | 73% | 2808 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,367 psi | 68% | 2854 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,727 psi | 64% | 2674 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 47,790 psi | 74% | 2818 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 39,668 psi | 61% | 2703 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,525 psi | 65% | 2726 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 51,866 psi | 80% | 2923 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,981 psi | 78% | 2907 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,127 psi | 53% | 2559 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,083 psi | 80% | 2913 fps | 100% |
| Hodgdon Superformance | 49.8 gr | 80% | 38,595 psi | 59% | 2710 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 42% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,707 psi | 81% | 2877 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,936 psi | 75% | 2808 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,010 psi | 78% | 2835 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 39,856 psi | 61% | 2654 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,149 psi | 66% | 2707 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 36,172 psi | 56% | 2608 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 51,503 psi | 79% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,502 psi | 78% | 2864 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 49,269 psi | 76% | 2946 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 53,577 psi | 82% | 2848 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,211 psi | 76% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,553 psi | 62% | 2654 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 38,812 psi | 60% | 2631 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 35,041 psi | 54% | 2579 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 53,417 psi | 82% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,230 psi | 83% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,559 psi | 76% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,991 psi | 69% | 2802 fps | 95.5% |
| Norma MRP | <<locked>> | 88% | 38,014 psi | 58% | 2743 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 37,405 psi | 58% | 2651 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 49,850 psi | 77% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 49,501 psi | 76% | 2959 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 36,361 psi | 56% | 2638 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 41,147 psi | 63% | 2769 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 43% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,718 psi | 73% | 2802 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 54,491 psi | 84% | 2992 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,193 psi | 68% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,289 psi | 57% | 2671 fps | 97.5% |
| ReloadSwiss RS 70 | 47.8 gr | 80% | 36,274 psi | 56% | 2677 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,785 psi | 63% | 2838 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,010 psi | 78% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,585 psi | 69% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,139 psi | 76% | 2848 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 43,091 psi | 66% | 2782 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,727 psi | 64% | 2674 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,553 psi | 62% | 2654 fps | 97.5% |
| Shooters World Precision | <<locked>> | 80% | 49,211 psi | 76% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,812 psi | 60% | 2631 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,818 psi | 70% | 2808 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,272 psi | 82% | 2894 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,317 psi | 84% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,977 psi | 71% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,740 psi | 61% | 2598 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,685 psi | 66% | 2779 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 53,882 psi | 83% | 2792 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,860 psi | 69% | 2753 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 53,998 psi | 83% | 2897 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 33,765 psi | 52% | 2605 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 41,017 psi | 63% | 2710 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 54,868 psi | 84% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,343 psi | 79% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,343 psi | 79% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,873 psi | 66% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,827 psi | 60% | 2654 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 43,033 psi | 66% | 2740 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 49,748 psi | 77% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,363 psi | 59% | 2654 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 29,573 psi | 45% | 2490 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 96% | 50,633 psi | 78% | 2986 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,942 psi | 58% | 2621 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 39,668 psi | 61% | 2703 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,137 psi | 42% | 2503 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,142 psi | 82% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,294 psi | 67% | 2749 fps | 95.1% |
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 106 powders for 6.5-06 A-Square loaded with the .264 | 123gr | Sierra MatchKing. Norma MRP delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,130 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 123.0 gr projectile in 0.264" calls for a 1:9.0 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, Hodgdon Superformance rank at the top here: for 6.5-06 A-Square with the .264 | 123gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.