Load Specifications
Load data in caliber 6 mm XC with .243 | 95gr | Barnes X S bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2015 | <<locked>> | 82% | 57,174 psi | 90% | 2936 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,450 psi | 90% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,725 psi | 90% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,520 psi | 85% | 2956 fps | 96.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,427 psi | 74% | 2930 fps | 97.1% |
| Accurate 4064 | <<locked>> | 88% | 57,638 psi | 90% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,753 psi | 89% | 3117 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 56,072 psi | 88% | 3045 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,681 psi | 89% | 3038 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,592 psi | 86% | 2986 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,173 psi | 88% | 2966 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,303 psi | 87% | 3163 fps | 99.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3071 fps | 95.7% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3071 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,305 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,375 psi | 85% | 3038 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,840 psi | 89% | 3163 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,433 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,512 psi | 70% | 2953 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3133 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,550 psi | 87% | 3054 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 55,100 psi | 86% | 3038 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,694 psi | 86% | 3002 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,188 psi | 88% | 2969 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,520 psi | 85% | 3022 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,521 psi | 87% | 3048 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 55,056 psi | 86% | 3100 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 92% | 55,187 psi | 86% | 3054 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 84% | 56,666 psi | 89% | 3054 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,840 psi | 89% | 3084 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,217 psi | 88% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,172 psi | 86% | 3130 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1880 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,305 psi | 90% | 3051 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,971 psi | 89% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,434 psi | 88% | 3025 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,927 psi | 88% | 2999 fps | 97.8% |
| IMR 4350 | <<locked>> | 96% | 54,737 psi | 86% | 3028 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,811 psi | 87% | 3028 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 56,840 psi | 89% | 3100 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 55,680 psi | 87% | 3068 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,592 psi | 86% | 2986 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,579 psi | 89% | 3025 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,969 psi | 86% | 2963 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 56,898 psi | 89% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,188 psi | 88% | 3031 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 57,276 psi | 90% | 3074 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 55,259 psi | 87% | 2992 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,463 psi | 87% | 2989 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,101 psi | 89% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,998 psi | 86% | 3071 fps | 95.8% |
| Norma MRPᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3084 fps | 96.5% |
| Norma URP | <<locked>> | 96% | 55,201 psi | 87% | 3097 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 57,348 psi | 90% | 3104 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,058 psi | 89% | 3140 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 54,969 psi | 86% | 3009 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,563 psi | 86% | 3025 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 58% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,434 psi | 87% | 3025 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,027 psi | 86% | 3107 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,099 psi | 85% | 3140 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,115 psi | 88% | 3133 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,926 psi | 86% | 3156 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 82% | 56,739 psi | 89% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,753 psi | 87% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,911 psi | 86% | 3028 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 54,694 psi | 86% | 3002 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,188 psi | 88% | 3031 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,579 psi | 89% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,898 psi | 89% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,276 psi | 90% | 3074 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,941 psi | 88% | 3084 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,406 psi | 90% | 3048 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,609 psi | 90% | 3064 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,767 psi | 87% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,463 psi | 88% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,956 psi | 88% | 2976 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 55,695 psi | 87% | 2920 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,579 psi | 89% | 3031 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,984 psi | 86% | 3025 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3153 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,142 psi | 83% | 3031 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 84% | 56,043 psi | 88% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,767 psi | 87% | 2956 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,680 psi | 87% | 2963 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,246 psi | 88% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,305 psi | 90% | 3087 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 55,158 psi | 86% | 2989 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,479 psi | 90% | 3012 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,594 psi | 89% | 3094 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 3038 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,145 psi | 90% | 3058 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,463 psi | 87% | 3041 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,056 psi | 86% | 3100 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,263 psi | 63% | 2979 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,667 psi | 90% | 3074 fps | 100% |
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 2015 | <<locked>> | 80% | 54,027 psi | 85% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,022 psi | 75% | 2831 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,143 psi | 85% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,414 psi | 76% | 2848 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 41,771 psi | 65% | 2815 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,339 psi | 71% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,040 psi | 53% | 2654 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 49,748 psi | 78% | 2936 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 42,424 psi | 66% | 2776 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,634 psi | 81% | 2936 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,852 psi | 83% | 2920 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,498 psi | 71% | 2976 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,705 psi | 79% | 3015 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,705 psi | 79% | 3015 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,569 psi | 67% | 2805 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,585 psi | 71% | 2874 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 35,346 psi | 55% | 2707 fps | 95.5% |
| Alliant Reloder-17 | 35.8 gr | 80% | 37,289 psi | 58% | 2785 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,488 psi | 49% | 2625 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 38,189 psi | 60% | 2867 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,994 psi | 77% | 2940 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 43,134 psi | 68% | 2822 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 45,876 psi | 72% | 2838 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,127 psi | 83% | 2920 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,140 psi | 80% | 2966 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,236 psi | 68% | 2815 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 88% | 45,687 psi | 72% | 2923 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 49,008 psi | 77% | 2940 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 50,285 psi | 79% | 2946 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,154 psi | 49% | 2556 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,282 psi | 73% | 2920 fps | 99.7% |
| Hodgdon Superformance | 42.5 gr | 90% | 48,153 psi | 75% | 2999 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 43% | 1677 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,993 psi | 75% | 2894 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 50,154 psi | 79% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,599 psi | 70% | 2812 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,717 psi | 73% | 2828 fps | 95.9% |
| IMR 4350 | <<locked>> | 92% | 48,588 psi | 76% | 2917 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,382 psi | 70% | 2812 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 34,780 psi | 55% | 2661 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 46,644 psi | 73% | 2904 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 51,634 psi | 81% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,734 psi | 78% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,153 psi | 77% | 2861 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,136 psi | 71% | 2825 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 39,755 psi | 62% | 2713 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 45,223 psi | 71% | 2851 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,008 psi | 77% | 2884 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 49,153 psi | 77% | 2887 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,991 psi | 71% | 2864 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 51,909 psi | 81% | 3015 fps | 95% |
| Norma MRP | <<locked>> | 98% | 46,528 psi | 73% | 3022 fps | 95.6% |
| Norma URP | <<locked>> | 82% | 35,984 psi | 56% | 2703 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 44,367 psi | 70% | 2874 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 41,829 psi | 66% | 2851 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 51,706 psi | 81% | 2949 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,227 psi | 80% | 2969 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,468 psi | 68% | 2795 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,153 psi | 75% | 2986 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,450 psi | 62% | 2851 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,505 psi | 56% | 2717 fps | 95.1% |
| ReloadSwiss RS 70 | 39 gr | 86% | 39,639 psi | 62% | 2835 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 53,650 psi | 84% | 2930 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,065 psi | 74% | 2841 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 40,596 psi | 64% | 2762 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 45,876 psi | 72% | 2838 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,755 psi | 62% | 2713 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,734 psi | 78% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,136 psi | 71% | 2825 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 45,223 psi | 71% | 2851 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,944 psi | 64% | 2805 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,575 psi | 79% | 2930 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,051 psi | 75% | 2900 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,661 psi | 78% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,858 psi | 66% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,918 psi | 69% | 2756 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,545 psi | 78% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,879 psi | 78% | 2920 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 40,915 psi | 64% | 2759 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 30,632 psi | 48% | 2602 fps | 97.1% |
| Somchem S385 | <<locked>> | 96% | 46,688 psi | 73% | 2913 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 49,922 psi | 78% | 2808 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,412 psi | 73% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,630 psi | 73% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,001 psi | 61% | 2690 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 35,012 psi | 55% | 2644 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,025 psi | 82% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,107 psi | 71% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,840 psi | 58% | 2703 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 34,272 psi | 54% | 2710 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,548 psi | 54% | 2615 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 51,996 psi | 81% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,687 psi | 72% | 2923 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,907 psi | 47% | 2648 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,732 psi | 75% | 2907 fps | 99.7% |
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 96 powders for 6 mm XC loaded with the .243 | 95gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 95.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, Alliant Power Pro Varmint 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 6 mm XC with the .243 | 95gr | Barnes X S 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.