Load Specifications
Bullet:.243 | 115gr | Barnes RNSP
Bullet Manufacturer:Barnes
Bullet Weight:115 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 | 115gr | Barnes RNSP bullet and 99 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.
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>> | 82% | 53,911 psi | 87% | 2566 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 52,910 psi | 85% | 2592 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,114 psi | 87% | 2651 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,143 psi | 89% | 2648 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,294 psi | 70% | 2559 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 52,924 psi | 85% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,028 psi | 90% | 2772 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 52,881 psi | 85% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,751 psi | 87% | 2664 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,039 psi | 82% | 2703 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,201 psi | 89% | 2664 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 52,852 psi | 85% | 2592 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,417 psi | 85% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,215 psi | 87% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,708 psi | 88% | 2713 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,722 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,607 psi | 88% | 2805 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,966 psi | 81% | 2694 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,147 psi | 66% | 2585 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2746 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,028 psi | 90% | 2730 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,882 psi | 89% | 2707 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,491 psi | 88% | 2677 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,417 psi | 86% | 2598 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,679 psi | 88% | 2694 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,448 psi | 89% | 2717 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 55,187 psi | 89% | 2772 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 55,608 psi | 90% | 2733 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 84% | 53,432 psi | 86% | 2674 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,664 psi | 87% | 2707 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,185 psi | 86% | 2710 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,724 psi | 90% | 2812 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 58% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,853 psi | 88% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,722 psi | 87% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,316 psi | 86% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,476 psi | 86% | 2635 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 54,795 psi | 88% | 2703 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,026 psi | 86% | 2657 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 53,084 psi | 86% | 2717 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 52,837 psi | 85% | 2694 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,201 psi | 89% | 2664 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 52,968 psi | 85% | 2644 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,709 psi | 90% | 2641 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,374 psi | 86% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,767 psi | 90% | 2700 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 53,476 psi | 86% | 2687 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 55,259 psi | 89% | 2661 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,506 psi | 90% | 2657 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,925 psi | 87% | 2697 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,593 psi | 90% | 2756 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 45,658 psi | 74% | 2697 fps | 96.8% |
| Norma URP | <<locked>> | 98% | 54,853 psi | 88% | 2756 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 54,447 psi | 88% | 2723 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,809 psi | 87% | 2759 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,390 psi | 89% | 2687 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,114 psi | 89% | 2703 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,985 psi | 90% | 2667 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,187 psi | 58% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,608 psi | 90% | 2700 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,288 psi | 89% | 2776 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,650 psi | 88% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,637 psi | 90% | 2795 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,376 psi | 89% | 2828 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 52,910 psi | 85% | 2595 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,477 psi | 89% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,694 psi | 88% | 2697 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,617 psi | 78% | 2674 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 54,491 psi | 88% | 2677 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,767 psi | 90% | 2700 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 52,968 psi | 85% | 2644 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,374 psi | 86% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,476 psi | 86% | 2687 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 52,852 psi | 85% | 2710 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,259 psi | 88% | 2671 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,897 psi | 89% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,388 psi | 86% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,301 psi | 86% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 52,504 psi | 85% | 2608 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,167 psi | 78% | 2667 fps | 96% |
| Somchem S335 | <<locked>> | 86% | 56,057 psi | 90% | 2598 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,824 psi | 87% | 2661 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,781 psi | 88% | 2694 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,272 psi | 86% | 2762 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,472 psi | 80% | 2657 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 53,737 psi | 87% | 2543 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,361 psi | 89% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,072 psi | 90% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 52,924 psi | 85% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,012 psi | 87% | 2707 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 56,014 psi | 90% | 2667 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,418 psi | 88% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,214 psi | 86% | 2717 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,107 psi | 73% | 2651 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,186 psi | 87% | 2687 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,101 psi | 90% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,666 psi | 90% | 2779 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,622 psi | 59% | 2598 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,897 psi | 89% | 2700 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% | 50,734 psi | 82% | 2523 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,337 psi | 70% | 2457 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,865 psi | 82% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,308 psi | 68% | 2434 fps | 95% |
| Accurate 3100 | <<locked>> | 94% | 35,244 psi | 57% | 2402 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 41,017 psi | 66% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,400 psi | 49% | 2300 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 46,891 psi | 76% | 2569 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,726 psi | 64% | 2428 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 47,558 psi | 77% | 2644 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,965 psi | 79% | 2572 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,530 psi | 80% | 2546 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,772 psi | 69% | 2612 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,610 psi | 64% | 2451 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,540 psi | 69% | 2513 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,748 psi | 50% | 2313 fps | 95.1% |
| Alliant Reloder-17 | 30.6 gr | 80% | 34,229 psi | 55% | 2431 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 46,644 psi | 75% | 2635 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,456 psi | 46% | 2283 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,561 psi | 53% | 2444 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,093 psi | 74% | 2575 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 39,407 psi | 64% | 2457 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 42,772 psi | 69% | 2480 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,372 psi | 81% | 2552 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,051 psi | 78% | 2598 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,089 psi | 65% | 2461 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 39,798 psi | 64% | 2507 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 46,050 psi | 74% | 2579 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,326 psi | 76% | 2579 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,181 psi | 45% | 2218 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,468 psi | 70% | 2559 fps | 99.9% |
| Hodgdon Superformance | 35.6 gr | 88% | 42,090 psi | 68% | 2575 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 43% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,368 psi | 73% | 2533 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 47,253 psi | 76% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,742 psi | 67% | 2457 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,367 psi | 72% | 2484 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 42,772 psi | 69% | 2507 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,829 psi | 67% | 2464 fps | 95.7% |
| IMR 4831 | <<locked>> | 82% | 31,517 psi | 51% | 2313 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,584 psi | 70% | 2543 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 48,965 psi | 79% | 2572 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,354 psi | 75% | 2549 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,630 psi | 75% | 2507 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 41,872 psi | 68% | 2464 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,405 psi | 59% | 2359 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 39,247 psi | 63% | 2438 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 45,672 psi | 74% | 2516 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,195 psi | 75% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,901 psi | 68% | 2500 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 48,675 psi | 79% | 2644 fps | 95.6% |
| Norma MRP | <<locked>> | 96% | 40,059 psi | 65% | 2585 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 32,895 psi | 53% | 2356 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 41,539 psi | 67% | 2516 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 36,492 psi | 59% | 2444 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 48,515 psi | 78% | 2579 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,544 psi | 78% | 2605 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,402 psi | 85% | 2615 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 43% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,263 psi | 65% | 2441 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,860 psi | 72% | 2612 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,405 psi | 59% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,097 psi | 52% | 2365 fps | 95.3% |
| ReloadSwiss RS 70 | 32.6 gr | 84% | 34,360 psi | 55% | 2421 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,850 psi | 80% | 2549 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,526 psi | 70% | 2474 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,883 psi | 59% | 2402 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 45,600 psi | 74% | 2621 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 42,772 psi | 69% | 2480 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,405 psi | 59% | 2359 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,354 psi | 75% | 2549 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,872 psi | 68% | 2464 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,247 psi | 63% | 2438 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,898 psi | 61% | 2451 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,181 psi | 76% | 2562 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,136 psi | 73% | 2539 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,108 psi | 76% | 2467 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,363 psi | 63% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,654 psi | 66% | 2408 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,194 psi | 73% | 2618 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 46,528 psi | 75% | 2467 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,934 psi | 76% | 2559 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,666 psi | 61% | 2405 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 27,528 psi | 44% | 2257 fps | 97.3% |
| Somchem S385 | <<locked>> | 96% | 43,323 psi | 70% | 2552 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 47,500 psi | 77% | 2457 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,395 psi | 70% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,540 psi | 70% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,781 psi | 58% | 2343 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 32,111 psi | 52% | 2306 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,052 psi | 79% | 2569 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,148 psi | 68% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,531 psi | 51% | 2306 fps | 95% |
| Vihtavuori N555 | <<locked>> | 88% | 30,705 psi | 50% | 2356 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,792 psi | 51% | 2283 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 48,805 psi | 79% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 39,798 psi | 64% | 2507 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,760 psi | 43% | 2300 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,976 psi | 73% | 2549 fps | 99.9% |
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 99 powders for 6 mm GT loaded with the .243 | 115gr | Barnes RNSP. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,828 fps. Accurate 3100 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 58–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.243" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 6 mm GT with the .243 | 115gr | Barnes RNSP 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.