Load Specifications
Load data in caliber 6 mm Rem. with .243 | 100gr | Hornady InterLock RN 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 60, ReloadSwiss RS 70 and Hodgdon H414.
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>> | 84% | 55,434 psi | 89% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,287 psi | 85% | 2904 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2933 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 55,695 psi | 89% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 52,373 psi | 84% | 2992 fps | 99.8% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,810 psi | 88% | 3133 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 54,781 psi | 88% | 2979 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,043 psi | 90% | 2982 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,954 psi | 87% | 3035 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,216 psi | 89% | 3110 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,737 psi | 86% | 3028 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,185 psi | 85% | 2953 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,345 psi | 86% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,301 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,433 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,434 psi | 90% | 3077 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,951 psi | 80% | 3012 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,079 psi | 75% | 2956 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,379 psi | 66% | 2864 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 3156 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,795 psi | 88% | 2995 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 53,983 psi | 87% | 2972 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,951 psi | 80% | 3012 fps | 96.5% |
| Bofors RP7 | <<locked>> | 90% | 53,432 psi | 86% | 2946 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 86% | 54,375 psi | 87% | 2986 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,752 psi | 88% | 3045 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,071 psi | 88% | 3012 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 82% | 55,419 psi | 89% | 2989 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,490 psi | 86% | 2979 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,738 psi | 89% | 3028 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,969 psi | 88% | 3081 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 58% | 1864 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,113 psi | 85% | 2940 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,825 psi | 90% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,506 psi | 89% | 2969 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,795 psi | 88% | 2946 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 54,288 psi | 87% | 2979 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,216 psi | 89% | 2979 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 53,171 psi | 85% | 2989 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 54,723 psi | 88% | 3002 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,288 psi | 89% | 2956 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,925 psi | 86% | 2904 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,666 psi | 89% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,143 psi | 88% | 2976 fps | 99.4% |
| Lovex S070 | <<locked>> | 92% | 53,113 psi | 85% | 2959 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,626 psi | 67% | 2772 fps | 96.9% |
| Norma 201 | <<locked>> | 82% | 53,664 psi | 86% | 2923 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,259 psi | 87% | 2920 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,405 psi | 90% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,172 psi | 88% | 3031 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 52,953 psi | 85% | 3100 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 54,984 psi | 88% | 3038 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,519 psi | 86% | 2989 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,867 psi | 86% | 3038 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,622 psi | 59% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,621 psi | 88% | 2969 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,375 psi | 87% | 3048 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,244 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,999 psi | 90% | 3074 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,853 psi | 88% | 3107 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 54,491 psi | 87% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,809 psi | 86% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,695 psi | 89% | 3009 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 3068 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 53,432 psi | 86% | 2946 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,143 psi | 88% | 2976 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,288 psi | 89% | 2956 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,666 psi | 89% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,113 psi | 85% | 2959 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,521 psi | 89% | 3025 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,217 psi | 90% | 2986 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,505 psi | 86% | 2953 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,737 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,448 psi | 89% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,955 psi | 88% | 2923 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 3061 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 54,288 psi | 87% | 2854 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,782 psi | 89% | 2969 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,012 psi | 87% | 2963 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,693 psi | 86% | 3038 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 3038 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 55,172 psi | 88% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,346 psi | 87% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,766 psi | 88% | 2897 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,564 psi | 89% | 2940 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,505 psi | 86% | 2976 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,559 psi | 78% | 2890 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 84% | 53,142 psi | 85% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,304 psi | 90% | 3038 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,707 psi | 85% | 3038 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,490 psi | 86% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,158 psi | 88% | 3054 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,438 psi | 68% | 2999 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,490 psi | 86% | 2959 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,026 psi | 85% | 2972 fps | 96.8% |
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% | 48,675 psi | 78% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,789 psi | 75% | 2785 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 38,058 psi | 61% | 2697 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 46,093 psi | 74% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,664 psi | 56% | 2638 fps | 96.4% |
| Accurate High Country | <<locked>> | 98% | 51,256 psi | 82% | 3071 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 51,517 psi | 83% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,714 psi | 70% | 2766 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 47,152 psi | 76% | 2910 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,834 psi | 77% | 2982 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,326 psi | 76% | 2913 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,019 psi | 71% | 2795 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,094 psi | 76% | 2864 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,113 psi | 55% | 2648 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,508 psi | 62% | 2782 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,717 psi | 75% | 2904 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,818 psi | 75% | 2953 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,311 psi | 45% | 2500 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,289 psi | 58% | 2736 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,838 psi | 56% | 2746 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,227 psi | 82% | 2936 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 44,164 psi | 71% | 2805 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 46,818 psi | 75% | 2953 fps | 95.6% |
| Bofors RP7 | <<locked>> | 82% | 41,626 psi | 67% | 2717 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 44,686 psi | 72% | 2812 fps | 98.5% |
| Hodgdon H414 | 38.8 gr | 82% | 39,291 psi | 63% | 2746 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 45,411 psi | 73% | 2835 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,083 psi | 84% | 2936 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,676 psi | 51% | 2543 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,457 psi | 78% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,437 psi | 66% | 2822 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 43% | 1667 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,908 psi | 80% | 2884 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,678 psi | 84% | 2920 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,963 psi | 74% | 2805 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,486 psi | 78% | 2831 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 42,380 psi | 68% | 2756 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,669 psi | 65% | 2700 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 33,591 psi | 54% | 2595 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 48,283 psi | 77% | 2894 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,532 psi | 83% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,720 psi | 81% | 2851 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,224 psi | 74% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,116 psi | 61% | 2648 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 38,667 psi | 62% | 2674 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 36,695 psi | 59% | 2667 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 50,415 psi | 81% | 2871 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,995 psi | 82% | 2871 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,441 psi | 74% | 2851 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 48,109 psi | 77% | 2907 fps | 95.5% |
| Norma MRP | <<locked>> | 92% | 40,292 psi | 65% | 2844 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,708 psi | 56% | 2635 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 46,557 psi | 75% | 2871 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,493 psi | 62% | 2736 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,485 psi | 44% | 1709 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,831 psi | 72% | 2792 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,589 psi | 81% | 2982 fps | 99.8% |
| ReloadSwiss RS 60 | 38.7 gr | 80% | 40,930 psi | 66% | 2844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,461 psi | 55% | 2654 fps | 95.9% |
| ReloadSwiss RS 70 | 40.3 gr | 82% | 36,201 psi | 58% | 2717 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 48,080 psi | 77% | 2822 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,582 psi | 67% | 2746 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,301 psi | 84% | 2949 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 94% | 45,455 psi | 73% | 2881 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 82% | 41,626 psi | 67% | 2717 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,116 psi | 61% | 2648 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,532 psi | 83% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,224 psi | 74% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,667 psi | 62% | 2674 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,612 psi | 68% | 2799 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,460 psi | 84% | 2923 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,024 psi | 80% | 2894 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,358 psi | 82% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,236 psi | 69% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,784 psi | 64% | 2641 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,020 psi | 72% | 2874 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 51,097 psi | 82% | 2805 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,098 psi | 84% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,047 psi | 67% | 2746 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 31,198 psi | 50% | 2589 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 43,352 psi | 70% | 2805 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 51,822 psi | 83% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,051 psi | 77% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,341 psi | 78% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,089 psi | 64% | 2677 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 36,056 psi | 58% | 2638 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 45,527 psi | 73% | 2838 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 46,702 psi | 75% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,592 psi | 57% | 2638 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 31,009 psi | 50% | 2582 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,418 psi | 57% | 2608 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 39,581 psi | 63% | 2749 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,485 psi | 46% | 2589 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,879 psi | 80% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,050 psi | 74% | 2851 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 95 powders for 6 mm Rem. loaded with the .243 | 100gr | Hornady InterLock RN. Alliant Reloder-26 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,156 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 100.0 gr projectile in 0.243" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 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 60, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for 6 mm Rem. with the .243 | 100gr | Hornady InterLock RN 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.