Load Specifications
Load data in caliber 6 mm GT with .243 | 55gr | Nosler Varmageddon bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H322, ADI AR 2219 and SNPE Vectan SP 10.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 86% | 54,853 psi | 88% | 3547 fps | 100% |
| Accurate 2015 | <<locked>> | 98% | 52,344 psi | 84% | 3586 fps | 99.7% |
| Accurate 2460 | <<locked>> | 96% | 55,492 psi | 90% | 3655 fps | 98.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 44,338 psi | 72% | 3488 fps | 99.1% |
| Accurate 2520ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 3704 fps | 98.1% |
| Accurate 4064ᴾ | <<locked>> | 100% | 41,104 psi | 66% | 3428 fps | 96.1% |
| Accurate LT-30 | <<locked>> | 92% | 55,390 psi | 89% | 3563 fps | 99.3% |
| Accurate LT-32 | <<locked>> | 92% | 55,840 psi | 90% | 3573 fps | 98% |
| ADI AR 2207 | <<locked>> | 90% | 55,071 psi | 89% | 3629 fps | 100% |
| ADI AR 2219 | <<locked>> | 92% | 54,201 psi | 87% | 3681 fps | 99.1% |
| ADI Benchmark 8208ᴾ | <<locked>> | 100% | 55,376 psi | 89% | 3658 fps | 96.2% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 52,417 psi | 85% | 3688 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 96% | 56,043 psi | 90% | 3684 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 88% | 53,606 psi | 86% | 3579 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 92% | 54,491 psi | 88% | 3537 fps | 99.4% |
| Hodgdon Benchmark | <<locked>> | 98% | 55,085 psi | 89% | 3602 fps | 96.8% |
| Hodgdon BL-C2ᴾ | <<locked>> | 100% | 53,229 psi | 86% | 3671 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 96% | 55,724 psi | 90% | 3707 fps | 99.2% |
| Hodgdon H335 | <<locked>> | 94% | 53,809 psi | 87% | 3661 fps | 98.3% |
| Hodgdon H4198 | <<locked>> | 88% | 54,215 psi | 87% | 3573 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,111 psi | 52% | 2287 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 49,342 psi | 80% | 3655 fps | 99.1% |
| IMR 4198 | <<locked>> | 94% | 53,882 psi | 87% | 3609 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 53,621 psi | 86% | 3540 fps | 100% |
| IMR 8208 XBRᴾ | <<locked>> | 100% | 55,376 psi | 89% | 3658 fps | 96.2% |
| Lovex D073.4 | <<locked>> | 88% | 51,793 psi | 84% | 3609 fps | 97.1% |
| Lovex D073.5 | <<locked>> | 96% | 55,738 psi | 90% | 3652 fps | 97.3% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 49,371 psi | 80% | 3589 fps | 96.9% |
| Lovex S053 | <<locked>> | 86% | 55,419 psi | 89% | 3527 fps | 100% |
| Norma 200 | <<locked>> | 90% | 53,055 psi | 86% | 3609 fps | 100% |
| Norma 202ᴾ | <<locked>> | 100% | 50,589 psi | 82% | 3599 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,198 psi | 52% | 2343 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 53,795 psi | 87% | 3573 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 96% | 55,651 psi | 90% | 3675 fps | 97.7% |
| Rottweil R 901ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3645 fps | 98.2% |
| Shooters World AR Plus | <<locked>> | 88% | 51,793 psi | 84% | 3609 fps | 97.1% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 49,371 psi | 80% | 3589 fps | 96.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 55,869 psi | 90% | 3343 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 92% | 54,810 psi | 88% | 3678 fps | 98.4% |
| SNPE Vectan SP 3 | <<locked>> | 94% | 53,737 psi | 87% | 3642 fps | 99.5% |
| SNPE Vectan Tubal 3000ᴾ | <<locked>> | 100% | 53,766 psi | 87% | 3553 fps | 98.1% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 43,105 psi | 70% | 3343 fps | 97.1% |
| Somchem S321 | <<locked>> | 96% | 53,316 psi | 86% | 3638 fps | 96.2% |
| Somchem S335ᴾ | <<locked>> | 100% | 52,475 psi | 85% | 3547 fps | 98.7% |
| Vihtavuori N120 | <<locked>> | 90% | 55,042 psi | 89% | 3563 fps | 100% |
| Vihtavuori N130 | <<locked>> | 96% | 53,417 psi | 86% | 3563 fps | 100% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 3553 fps | 99.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 44,701 psi | 72% | 3491 fps | 99% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 47,877 psi | 77% | 3504 fps | 97.6% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 46,441 psi | 75% | 3484 fps | 96.8% |
| Winchester 748ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 3698 fps | 97% |
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 1680 | <<locked>> | 80% | 45,034 psi | 73% | 3363 fps | 99.5% |
| Accurate 2015 | <<locked>> | 82% | 31,299 psi | 50% | 3087 fps | 95% |
| Accurate 2460 | <<locked>> | 88% | 41,713 psi | 67% | 3376 fps | 95.3% |
| Accurate 2495 | <<locked>> | 90% | 31,140 psi | 50% | 3150 fps | 95.5% |
| Accurate 2520 | <<locked>> | 92% | 42,264 psi | 68% | 3425 fps | 95% |
| Accurate 4064 | <<locked>> | 98% | 38,232 psi | 62% | 3356 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 38,261 psi | 62% | 3196 fps | 95.9% |
| Accurate LT-32 | <<locked>> | 84% | 43,569 psi | 70% | 3323 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 40,147 psi | 65% | 3340 fps | 100% |
| ADI AR 2219 | 31.7 gr | 82% | 38,203 psi | 62% | 3327 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 98% | 51,692 psi | 83% | 3586 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 26,934 psi | 43% | 3028 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,895 psi | 55% | 3196 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 41,655 psi | 67% | 3337 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,796 psi | 59% | 3163 fps | 95.9% |
| Hodgdon Benchmark | <<locked>> | 94% | 48,544 psi | 78% | 3478 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 98% | 49,530 psi | 80% | 3599 fps | 95.7% |
| Hodgdon H322 | 31.4 gr | 84% | 37,217 psi | 60% | 3301 fps | 95.2% |
| Hodgdon H335 | <<locked>> | 86% | 40,654 psi | 66% | 3379 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 42,119 psi | 68% | 3317 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,670 psi | 38% | 2054 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 35,607 psi | 57% | 3320 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 35,433 psi | 57% | 3202 fps | 98.5% |
| IMR 4227 | <<locked>> | 80% | 47,282 psi | 76% | 3422 fps | 100% |
| IMR 8208 XBR | <<locked>> | 98% | 51,692 psi | 83% | 3586 fps | 95.4% |
| Lovex D073.4 | <<locked>> | 84% | 44,788 psi | 72% | 3461 fps | 95.4% |
| Lovex D073.5 | <<locked>> | 92% | 48,269 psi | 78% | 3510 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 96% | 43,004 psi | 69% | 3451 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 46,514 psi | 75% | 3373 fps | 100% |
| Norma 200 | <<locked>> | 80% | 38,261 psi | 62% | 3297 fps | 98.9% |
| Norma 202 | <<locked>> | 94% | 41,669 psi | 67% | 3402 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,554 psi | 38% | 2100 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 47,630 psi | 77% | 3461 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 45,542 psi | 73% | 3468 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 92% | 42,989 psi | 69% | 3402 fps | 95.7% |
| Shooters World AR Plus | <<locked>> | 84% | 44,788 psi | 72% | 3461 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 96% | 43,004 psi | 69% | 3451 fps | 95.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 42,656 psi | 69% | 3127 fps | 100% |
| SNPE Vectan SP 10 | 33.6 gr | 84% | 41,597 psi | 67% | 3396 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,432 psi | 56% | 3199 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 41,785 psi | 67% | 3307 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 38,014 psi | 61% | 3225 fps | 95.7% |
| Somchem S321 | <<locked>> | 94% | 49,705 psi | 80% | 3566 fps | 95.3% |
| Somchem S335 | <<locked>> | 90% | 38,218 psi | 62% | 3238 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 40,263 psi | 65% | 3291 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,619 psi | 53% | 3091 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 84% | 32,126 psi | 52% | 3077 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 90% | 32,343 psi | 52% | 3179 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 94% | 39,102 psi | 63% | 3307 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 96% | 40,712 psi | 66% | 3353 fps | 95.2% |
| Winchester 748 | <<locked>> | 96% | 47,340 psi | 76% | 3563 fps | 95.4% |
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 51 powders for 6 mm GT loaded with the .243 | 55gr | Nosler Varmageddon. Hodgdon H322 delivers the highest muzzle velocity at 3,707 fps; across all powders the maximum-charge window runs from 2,287 fps to 3,707 fps. Accurate 2495 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 55.0 gr projectile in 0.243" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 2520, Accurate 4064 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. Hodgdon H322, ADI AR 2219, SNPE Vectan SP 10 rank at the top here: for 6 mm GT with the .243 | 55gr | Nosler Varmageddon 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.