Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:100 gr
Bullet Diameter:0.243"
Bullet Length:<<locked>>
Caliber:6 mm GT load data
Case Length (l3):1.725"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:43.5 Grains of Water
Primer Size:Small Rifle (SR)
Barrel Length:24"
Max. allowed Pressure:62,001 psi
Recommended Twist Rate:1:10.5
Load data in caliber 6 mm GT with .243 | 100gr | Speer Grand Slam bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Alliant Reloder-17 and ReloadSwiss RS 60.
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 2015 | <<locked>> | 86% | 55,680 psi | 90% | 2782 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,447 psi | 88% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,259 psi | 88% | 2808 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,970 psi | 90% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,577 psi | 86% | 2795 fps | 96% |
| Accurate 4064 | <<locked>> | 92% | 53,969 psi | 87% | 2851 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,403 psi | 86% | 2923 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 88% | 55,071 psi | 89% | 2887 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 56,043 psi | 90% | 2884 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,882 psi | 87% | 2835 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,563 psi | 88% | 2815 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,564 psi | 90% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,505 psi | 88% | 2999 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,535 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,347 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,101 psi | 90% | 2923 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,503 psi | 83% | 2923 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,895 psi | 85% | 2972 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,782 psi | 59% | 2654 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,886 psi | 66% | 2802 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,476 psi | 88% | 2894 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 52,591 psi | 85% | 2867 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,316 psi | 86% | 2835 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,680 psi | 90% | 2818 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,156 psi | 86% | 2864 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,042 psi | 89% | 2963 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 54,563 psi | 88% | 2831 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,579 psi | 90% | 2858 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,911 psi | 87% | 2877 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 98% | 52,924 psi | 85% | 2920 fps | 97% |
| Hodgdon H4350 | <<locked>> | 96% | 53,969 psi | 87% | 2884 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 88% | 55,593 psi | 90% | 2897 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2805 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,650 psi | 88% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,925 psi | 87% | 2953 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 57% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,490 psi | 86% | 2848 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,361 psi | 89% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,158 psi | 89% | 2861 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,506 psi | 90% | 2841 fps | 97.3% |
| IMR 4198 | <<locked>> | 82% | 55,434 psi | 89% | 2746 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,084 psi | 86% | 2851 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,100 psi | 89% | 2864 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,778 psi | 82% | 2864 fps | 98.9% |
| IMR 4895 | <<locked>> | 90% | 54,230 psi | 87% | 2904 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,882 psi | 87% | 2835 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,896 psi | 87% | 2818 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,157 psi | 87% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,781 psi | 88% | 2815 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,984 psi | 89% | 2861 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,317 psi | 88% | 2858 fps | 98.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,969 psi | 89% | 2887 fps | 97.5% |
| Norma 201 | <<locked>> | 88% | 53,432 psi | 86% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,969 psi | 87% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,259 psi | 89% | 2910 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,634 psi | 85% | 2913 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 90% | 52,533 psi | 85% | 2884 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,561 psi | 83% | 2904 fps | 97.6% |
| Ramshot TAC | <<locked>> | 86% | 54,302 psi | 88% | 2851 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,809 psi | 87% | 2871 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,129 psi | 89% | 2838 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 57% | 1788 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,316 psi | 86% | 2815 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,215 psi | 87% | 2858 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,881 psi | 85% | 2933 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,576 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,171 psi | 86% | 2946 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,214 psi | 86% | 2972 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 86% | 54,563 psi | 88% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,085 psi | 87% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,854 psi | 90% | 2907 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,316 psi | 86% | 2835 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,317 psi | 88% | 2858 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,157 psi | 87% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,984 psi | 89% | 2861 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,969 psi | 89% | 2887 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,128 psi | 87% | 2917 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,417 psi | 85% | 2825 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,214 psi | 86% | 2851 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,448 psi | 89% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,448 psi | 89% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,549 psi | 88% | 2808 fps | 97.1% |
| Somchem S321 | <<locked>> | 84% | 54,984 psi | 89% | 2867 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,418 psi | 88% | 2766 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,622 psi | 90% | 2871 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 52,866 psi | 85% | 2854 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,065 psi | 76% | 2861 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,201 psi | 89% | 2736 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,550 psi | 90% | 2759 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,664 psi | 87% | 2795 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,433 psi | 88% | 2808 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,259 psi | 88% | 2835 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,347 psi | 89% | 2910 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 54,650 psi | 88% | 2838 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,692 psi | 85% | 2808 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,273 psi | 88% | 2917 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,813 psi | 64% | 2733 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,028 psi | 90% | 2894 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,114 psi | 87% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,924 psi | 85% | 2920 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,822 psi | 53% | 2625 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,895 psi | 85% | 2861 fps | 99.9% |
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% | 46,340 psi | 75% | 2648 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,821 psi | 82% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,218 psi | 63% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,759 psi | 74% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,488 psi | 81% | 2743 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 37,057 psi | 60% | 2562 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,346 psi | 57% | 2585 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,685 psi | 69% | 2671 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 36,216 psi | 58% | 2516 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,759 psi | 72% | 2684 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,512 psi | 72% | 2674 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,214 psi | 84% | 2887 fps | 99.9% |
| Alliant Power Pro 2000-MR | 31.5 gr | 80% | 38,537 psi | 62% | 2687 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,723 psi | 58% | 2539 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,025 psi | 84% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,479 psi | 62% | 2602 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,679 psi | 58% | 2595 fps | 95.2% |
| Alliant Reloder-17 | 31 gr | 80% | 30,719 psi | 50% | 2490 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,430 psi | 52% | 2539 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,116 psi | 61% | 2736 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,553 psi | 67% | 2667 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 35,201 psi | 57% | 2539 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 49,763 psi | 80% | 2772 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,383 psi | 75% | 2671 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,221 psi | 70% | 2700 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,848 psi | 77% | 2844 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 51,256 psi | 83% | 2782 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,895 psi | 84% | 2802 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,682 psi | 62% | 2598 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 94% | 46,441 psi | 75% | 2805 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 94% | 50,879 psi | 82% | 2831 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,047 psi | 69% | 2684 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,748 psi | 50% | 2438 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,870 psi | 63% | 2648 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 50,270 psi | 81% | 2890 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 42% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,307 psi | 67% | 2635 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 42,496 psi | 69% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,000 psi | 61% | 2552 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,166 psi | 74% | 2684 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,127 psi | 84% | 2703 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,053 psi | 81% | 2802 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,861 psi | 74% | 2707 fps | 95% |
| IMR 4831 | <<locked>> | 90% | 36,506 psi | 59% | 2592 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,378 psi | 64% | 2635 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,759 psi | 72% | 2684 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 50,705 psi | 82% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,611 psi | 67% | 2651 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,946 psi | 69% | 2612 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 37,971 psi | 61% | 2559 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 39,740 psi | 64% | 2595 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 45,571 psi | 74% | 2730 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 42,018 psi | 68% | 2628 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 42,003 psi | 68% | 2635 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,840 psi | 61% | 2592 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 35,636 psi | 57% | 2582 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,202 psi | 60% | 2598 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 42,438 psi | 68% | 2733 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,570 psi | 72% | 2680 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,903 psi | 71% | 2700 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,341 psi | 78% | 2730 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 43% | 1601 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,227 psi | 81% | 2769 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,657 psi | 72% | 2694 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,234 psi | 65% | 2703 fps | 97.4% |
| ReloadSwiss RS 60 | 31 gr | 80% | 32,692 psi | 53% | 2559 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,550 psi | 61% | 2654 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,756 psi | 66% | 2726 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 45,672 psi | 74% | 2671 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,697 psi | 64% | 2575 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 33,243 psi | 54% | 2487 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 49,763 psi | 80% | 2772 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,740 psi | 64% | 2595 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,611 psi | 67% | 2651 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,971 psi | 61% | 2559 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 45,571 psi | 74% | 2730 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,272 psi | 55% | 2536 fps | 96.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,018 psi | 69% | 2657 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,321 psi | 67% | 2641 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,337 psi | 70% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,911 psi | 58% | 2451 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,124 psi | 78% | 2703 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 48,051 psi | 78% | 2759 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,047 psi | 69% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,351 psi | 68% | 2651 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 34,258 psi | 55% | 2497 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 28,036 psi | 45% | 2421 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 48,936 psi | 79% | 2651 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,584 psi | 70% | 2582 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,146 psi | 63% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,885 psi | 64% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,489 psi | 52% | 2434 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 88% | 37,492 psi | 60% | 2592 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 44,686 psi | 72% | 2677 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 38,189 psi | 62% | 2556 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,811 psi | 59% | 2592 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 96% | 34,751 psi | 56% | 2618 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,734 psi | 50% | 2402 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 44,280 psi | 71% | 2723 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 46,441 psi | 75% | 2805 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,734 psi | 50% | 2556 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,524 psi | 65% | 2641 fps | 98.5% |
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 102 powders for 6 mm GT loaded with the .243 | 100gr | Speer Grand Slam. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,999 fps. Accurate 4350 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:10.5 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 Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 6 mm GT with the .243 | 100gr | Speer Grand Slam 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.