Load Specifications
Load data in caliber 6 mm GT with .243 | 105gr | Barnes Match Burner BT bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Alliant Power Pro 2000-MR 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 2015 | <<locked>> | 84% | 53,635 psi | 87% | 2684 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,448 psi | 89% | 2756 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,434 psi | 89% | 2753 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,751 psi | 87% | 2769 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,172 psi | 89% | 2753 fps | 96.8% |
| Accurate 4064 | <<locked>> | 92% | 55,288 psi | 89% | 2799 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,129 psi | 89% | 2881 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 56,101 psi | 90% | 2831 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 53,795 psi | 87% | 2782 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,303 psi | 89% | 2785 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 52,649 psi | 85% | 2717 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,840 psi | 90% | 2949 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,505 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,983 psi | 87% | 2822 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 2877 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,896 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,811 psi | 61% | 2618 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,916 psi | 68% | 2766 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 52,518 psi | 85% | 2795 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 53,896 psi | 87% | 2815 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,462 psi | 88% | 2785 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,737 psi | 87% | 2720 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,302 psi | 88% | 2812 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,562 psi | 85% | 2854 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 55,883 psi | 90% | 2776 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,143 psi | 89% | 2828 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 54,476 psi | 88% | 2877 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 96% | 55,259 psi | 89% | 2838 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 53,345 psi | 86% | 2795 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2759 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,028 psi | 90% | 2874 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,129 psi | 89% | 2910 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 57% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,462 psi | 88% | 2795 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 52,982 psi | 85% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,388 psi | 86% | 2766 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,229 psi | 86% | 2740 fps | 97.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,433 psi | 88% | 2808 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,026 psi | 86% | 2766 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,243 psi | 84% | 2822 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 55,361 psi | 89% | 2851 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,303 psi | 89% | 2785 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,434 psi | 89% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,927 psi | 90% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,593 psi | 90% | 2759 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 52,808 psi | 85% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,608 psi | 90% | 2812 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 53,069 psi | 86% | 2792 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 54,810 psi | 88% | 2776 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,492 psi | 90% | 2782 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,200 psi | 86% | 2808 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 55,187 psi | 89% | 2858 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 54,143 psi | 87% | 2867 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 53,853 psi | 87% | 2838 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,069 psi | 86% | 2864 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 55,347 psi | 89% | 2799 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,911 psi | 89% | 2818 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,072 psi | 90% | 2785 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 58% | 1739 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,665 psi | 88% | 2762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,405 psi | 89% | 2812 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,708 psi | 88% | 2890 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,998 psi | 87% | 2923 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,520 psi | 88% | 2897 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,810 psi | 88% | 2930 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 55,854 psi | 90% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,521 psi | 90% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,766 psi | 87% | 2808 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,462 psi | 88% | 2785 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,608 psi | 90% | 2812 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,927 psi | 90% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 52,808 psi | 85% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,069 psi | 86% | 2792 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,593 psi | 90% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,041 psi | 87% | 2782 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,723 psi | 88% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,316 psi | 86% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,026 psi | 86% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,854 psi | 90% | 2762 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 52,895 psi | 85% | 2766 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,738 psi | 90% | 2713 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,563 psi | 86% | 2776 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 54,520 psi | 88% | 2808 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,530 psi | 78% | 2818 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,040 psi | 86% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,519 psi | 86% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,201 psi | 89% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,985 psi | 90% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,999 psi | 90% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,432 psi | 86% | 2815 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 55,637 psi | 90% | 2782 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,288 psi | 88% | 2759 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,883 psi | 90% | 2871 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,162 psi | 66% | 2697 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,780 psi | 87% | 2795 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,317 psi | 89% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,476 psi | 88% | 2877 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,837 psi | 55% | 2608 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,592 psi | 88% | 2815 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% | 47,398 psi | 76% | 2595 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,141 psi | 84% | 2713 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,335 psi | 65% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,123 psi | 76% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,095 psi | 78% | 2641 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,116 psi | 61% | 2520 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,011 psi | 55% | 2493 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 43,743 psi | 71% | 2628 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 37,101 psi | 60% | 2477 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,759 psi | 74% | 2635 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 45,716 psi | 74% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | 31.1 gr | 80% | 39,639 psi | 64% | 2651 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,680 psi | 59% | 2500 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,508 psi | 64% | 2562 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,563 psi | 56% | 2507 fps | 95.4% |
| Alliant Reloder-17 | 30.6 gr | 80% | 31,604 psi | 51% | 2461 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,589 psi | 51% | 2461 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,695 psi | 59% | 2644 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,786 psi | 69% | 2628 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 36,274 psi | 59% | 2503 fps | 98.3% |
| Bofors RP7 | <<locked>> | 92% | 48,225 psi | 78% | 2684 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,355 psi | 76% | 2621 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,498 psi | 72% | 2654 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,936 psi | 79% | 2795 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 52,504 psi | 85% | 2730 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,086 psi | 60% | 2503 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 92% | 44,483 psi | 72% | 2707 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 48,602 psi | 78% | 2726 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 44,135 psi | 71% | 2638 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,733 psi | 48% | 2356 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,030 psi | 65% | 2608 fps | 99.1% |
| Hodgdon Superformance | 38 gr | 94% | 47,863 psi | 77% | 2785 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 42% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,322 psi | 68% | 2589 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 43,627 psi | 70% | 2631 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,885 psi | 63% | 2510 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,193 psi | 71% | 2582 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 47,877 psi | 77% | 2700 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,034 psi | 71% | 2608 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 35,201 psi | 57% | 2503 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 40,451 psi | 65% | 2592 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 45,759 psi | 74% | 2635 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 51,706 psi | 83% | 2717 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,830 psi | 69% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,830 psi | 71% | 2566 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 38,957 psi | 63% | 2516 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 38,479 psi | 62% | 2507 fps | 95.1% |
| Lovex S070 | <<locked>> | 92% | 43,918 psi | 71% | 2635 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,004 psi | 69% | 2585 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 43,047 psi | 69% | 2589 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,870 psi | 63% | 2552 fps | 98.1% |
| Norma 204 | <<locked>> | 98% | 51,401 psi | 83% | 2799 fps | 95% |
| Norma URP | <<locked>> | 86% | 34,272 psi | 55% | 2490 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,290 psi | 62% | 2562 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 41,017 psi | 66% | 2644 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,730 psi | 74% | 2641 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,136 psi | 73% | 2661 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,516 psi | 80% | 2684 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 43% | 1555 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,459 psi | 83% | 2717 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,917 psi | 69% | 2598 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,118 psi | 66% | 2657 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,649 psi | 54% | 2526 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,984 psi | 58% | 2559 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,015 psi | 63% | 2631 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,673 psi | 75% | 2621 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,625 psi | 66% | 2530 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,214 psi | 55% | 2451 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 48,225 psi | 78% | 2684 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,479 psi | 62% | 2507 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,830 psi | 69% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,957 psi | 63% | 2516 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 43,918 psi | 71% | 2635 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,940 psi | 56% | 2490 fps | 96.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,859 psi | 71% | 2612 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,061 psi | 68% | 2592 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,208 psi | 71% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,738 psi | 59% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,062 psi | 69% | 2556 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 49,400 psi | 80% | 2713 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,005 psi | 71% | 2539 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,555 psi | 70% | 2612 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 35,201 psi | 57% | 2461 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 27,151 psi | 44% | 2339 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 49,937 psi | 81% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,483 psi | 72% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,147 psi | 65% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,901 psi | 66% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,388 psi | 54% | 2395 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,042 psi | 58% | 2500 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 45,788 psi | 74% | 2631 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,160 psi | 63% | 2513 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,476 psi | 57% | 2500 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 31,604 psi | 51% | 2480 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,588 psi | 48% | 2316 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 45,556 psi | 73% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 44,846 psi | 72% | 2713 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,805 psi | 48% | 2480 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,684 psi | 67% | 2602 fps | 99% |
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 mm GT loaded with the .243 | 105gr | Barnes Match Burner BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,949 fps. Accurate 4350 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 (427 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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. Alliant Reloder-17, Alliant Power Pro 2000-MR, Hodgdon Superformance rank at the top here: for 6 mm GT with the .243 | 105gr | Barnes Match Burner BT 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.