Load Specifications
Load data in caliber 6 mm Rem. with .243 | 105gr | Geco SOFTPOINT bullet and 95 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-16 and Alliant Reloder-26.
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>> | 84% | 56,202 psi | 90% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,172 psi | 87% | 2851 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,314 psi | 82% | 2887 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 53,084 psi | 85% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,664 psi | 86% | 2946 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,840 psi | 90% | 3084 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 55,506 psi | 89% | 2917 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,432 psi | 86% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,520 psi | 87% | 2979 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,970 psi | 90% | 3048 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,723 psi | 88% | 2979 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,998 psi | 87% | 2897 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,505 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,476 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,796 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,940 psi | 86% | 2969 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2966 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,080 psi | 77% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,916 psi | 67% | 2815 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 3104 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,753 psi | 89% | 2940 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,760 psi | 75% | 2884 fps | 95.9% |
| Bofors RP3 | <<locked>> | 86% | 54,940 psi | 88% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2966 fps | 97.1% |
| Bofors RP7 | <<locked>> | 90% | 54,346 psi | 87% | 2890 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 86% | 55,332 psi | 89% | 2930 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 56,057 psi | 90% | 2999 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 55,796 psi | 89% | 2953 fps | 98.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2976 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 56,130 psi | 90% | 2927 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,723 psi | 88% | 2927 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,362 psi | 90% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,217 psi | 90% | 3035 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,766 psi | 86% | 2877 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,275 psi | 90% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,550 psi | 89% | 2890 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 55,027 psi | 88% | 2923 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,130 psi | 90% | 2923 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 54,027 psi | 87% | 2936 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,941 psi | 90% | 2949 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,188 psi | 90% | 2894 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,433 psi | 87% | 2841 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,069 psi | 85% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,144 psi | 90% | 2920 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 53,751 psi | 86% | 2904 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,453 psi | 68% | 2730 fps | 97.5% |
| Norma 201 | <<locked>> | 82% | 54,288 psi | 87% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,940 psi | 88% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,795 psi | 86% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,115 psi | 90% | 2982 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 53,911 psi | 86% | 3051 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 55,869 psi | 90% | 2982 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,201 psi | 87% | 2930 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,882 psi | 88% | 2982 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,796 psi | 59% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,230 psi | 89% | 2910 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,332 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,100 psi | 88% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,534 psi | 86% | 2966 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,550 psi | 89% | 3048 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,143 psi | 88% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,795 psi | 88% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,098 psi | 85% | 2897 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 98% | 52,881 psi | 85% | 2949 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 54,346 psi | 87% | 2890 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,144 psi | 90% | 2920 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,188 psi | 90% | 2894 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,069 psi | 85% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,751 psi | 86% | 2904 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 52,852 psi | 85% | 2913 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,302 psi | 87% | 2894 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,201 psi | 89% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,144 psi | 90% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,086 psi | 90% | 2874 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,014 psi | 90% | 3005 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 54,853 psi | 88% | 2789 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,940 psi | 88% | 2904 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,766 psi | 88% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,882 psi | 86% | 2933 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 55,709 psi | 89% | 2776 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,405 psi | 89% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,521 psi | 89% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,173 psi | 90% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,665 psi | 88% | 2927 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,574 psi | 79% | 2848 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 53,983 psi | 87% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,766 psi | 86% | 2930 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2986 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,389 psi | 87% | 3035 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,099 psi | 87% | 2890 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,057 psi | 90% | 2999 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,482 psi | 70% | 2956 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,360 psi | 87% | 2900 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2923 fps | 97.4% |
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 2495 | <<locked>> | 80% | 49,647 psi | 80% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,471 psi | 76% | 2736 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 36,477 psi | 58% | 2602 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 47,036 psi | 75% | 2749 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,302 psi | 57% | 2592 fps | 97.1% |
| Accurate High Country | <<locked>> | 96% | 48,791 psi | 78% | 2959 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 52,141 psi | 84% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,483 psi | 71% | 2717 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 44,817 psi | 72% | 2802 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,704 psi | 78% | 2927 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,121 psi | 72% | 2805 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,889 psi | 72% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,703 psi | 76% | 2808 fps | 99.8% |
| Alliant Reloder-16 | 35.2 gr | 80% | 34,780 psi | 56% | 2605 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,218 psi | 63% | 2733 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,570 psi | 71% | 2795 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,454 psi | 71% | 2841 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,021 psi | 43% | 2402 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,664 psi | 56% | 2635 fps | 95.4% |
| Alliant Reloder-26 | 41.8 gr | 86% | 33,272 psi | 53% | 2644 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,040 psi | 83% | 2881 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,830 psi | 70% | 2825 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 44,831 psi | 72% | 2749 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,454 psi | 71% | 2841 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 39,842 psi | 64% | 2615 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 45,310 psi | 73% | 2759 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 39,987 psi | 64% | 2697 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 43,323 psi | 69% | 2726 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 98% | 52,301 psi | 84% | 2910 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,721 psi | 85% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,387 psi | 52% | 2503 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,559 psi | 79% | 2861 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,076 psi | 67% | 2772 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 43% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,459 psi | 81% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,775 psi | 75% | 2753 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,037 psi | 79% | 2779 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 40,190 psi | 64% | 2644 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,133 psi | 66% | 2648 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 34,142 psi | 55% | 2546 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 48,921 psi | 78% | 2838 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,330 psi | 84% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,517 psi | 83% | 2795 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,050 psi | 75% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,841 psi | 62% | 2602 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 37,072 psi | 59% | 2579 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 35,143 psi | 56% | 2569 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 51,300 psi | 82% | 2815 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,924 psi | 83% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,050 psi | 75% | 2795 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,774 psi | 73% | 2799 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 41,089 psi | 66% | 2799 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 35,505 psi | 57% | 2595 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 47,369 psi | 76% | 2818 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,782 psi | 59% | 2635 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 44% | 1660 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,513 psi | 73% | 2743 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,416 psi | 82% | 2927 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,698 psi | 67% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,186 psi | 56% | 2612 fps | 96.7% |
| ReloadSwiss RS 70 | 38.5 gr | 80% | 34,374 psi | 55% | 2612 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 48,588 psi | 78% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,467 psi | 68% | 2700 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,792 psi | 80% | 2838 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 43,569 psi | 70% | 2779 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 39,842 psi | 64% | 2615 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,841 psi | 62% | 2602 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,330 psi | 84% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,050 psi | 75% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,072 psi | 59% | 2579 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,308 psi | 69% | 2746 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,705 psi | 81% | 2835 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,083 psi | 84% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,947 psi | 70% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,840 psi | 61% | 2536 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,149 psi | 69% | 2772 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,924 psi | 83% | 2749 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,859 psi | 69% | 2697 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 31,734 psi | 51% | 2543 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 41,321 psi | 66% | 2703 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 52,605 psi | 84% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,921 psi | 78% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,255 psi | 79% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,915 psi | 66% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,651 psi | 59% | 2589 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 43,482 psi | 70% | 2733 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 47,297 psi | 76% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,187 psi | 58% | 2592 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 29,588 psi | 47% | 2480 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 98% | 50,966 psi | 82% | 2972 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,056 psi | 58% | 2562 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 40,292 psi | 65% | 2703 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,195 psi | 44% | 2490 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,705 psi | 81% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,978 psi | 75% | 2805 fps | 95.9% |
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 95 powders for 6 mm Rem. loaded with the .243 | 105gr | Geco SOFTPOINT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,104 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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. ReloadSwiss RS 70, Alliant Reloder-16, Alliant Reloder-26 rank at the top here: for 6 mm Rem. with the .243 | 105gr | Geco SOFTPOINT 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.