Load Specifications
Load data in caliber 6.8 mm Rem. SPC with .277 | 90gr | Speer TNT HP bullet and 37 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2219, Norma 200 and ADI AR 2207.
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>> | 90% | 52,663 psi | 90% | 3009 fps | 99.7% |
| Accurate 2015ᴾ | <<locked>> | 100% | 44,585 psi | 76% | 2963 fps | 98.2% |
| Accurate 2460ᴾ | <<locked>> | 100% | 49,951 psi | 85% | 3068 fps | 96.3% |
| Accurate LT-30 | <<locked>> | 96% | 52,982 psi | 90% | 3009 fps | 98.3% |
| Accurate LT-32 | <<locked>> | 94% | 50,256 psi | 86% | 2959 fps | 95.8% |
| ADI AR 2205 | <<locked>> | 82% | 51,561 psi | 88% | 2881 fps | 100% |
| ADI AR 2207 | <<locked>> | 94% | 51,547 psi | 88% | 3071 fps | 100% |
| ADI AR 2219 | <<locked>> | 96% | 49,980 psi | 85% | 3097 fps | 97.6% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 41,292 psi | 70% | 2986 fps | 99.5% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 51,300 psi | 87% | 3107 fps | 99.7% |
| Alliant Reloder-7 | <<locked>> | 92% | 50,705 psi | 86% | 3028 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 96% | 51,198 psi | 87% | 2992 fps | 98.3% |
| Hodgdon H322ᴾ | <<locked>> | 100% | 51,416 psi | 88% | 3123 fps | 97.9% |
| Hodgdon H335ᴾ | <<locked>> | 100% | 52,663 psi | 90% | 3140 fps | 97.1% |
| Hodgdon H4198 | <<locked>> | 92% | 51,619 psi | 88% | 3005 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,067 psi | 53% | 1860 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 39,015 psi | 66% | 2940 fps | 95.8% |
| IMR 4198 | <<locked>> | 98% | 50,633 psi | 86% | 3045 fps | 99.9% |
| IMR 4227 | <<locked>> | 88% | 51,866 psi | 88% | 2995 fps | 100% |
| Lovex D060 | <<locked>> | 82% | 51,619 psi | 88% | 3031 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 94% | 51,300 psi | 87% | 3094 fps | 95.8% |
| Lovex S053 | <<locked>> | 88% | 50,038 psi | 85% | 2943 fps | 100% |
| Norma 200 | <<locked>> | 96% | 51,938 psi | 88% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,690 psi | 52% | 1903 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 88% | 51,474 psi | 88% | 3028 fps | 100% |
| Shooters World AR Plus | <<locked>> | 94% | 51,300 psi | 87% | 3094 fps | 95.8% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 51,619 psi | 88% | 3031 fps | 99.9% |
| Shooters World SOCOM | <<locked>> | 82% | 53,040 psi | 90% | 3005 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 92% | 50,952 psi | 87% | 2792 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 96% | 50,314 psi | 86% | 3097 fps | 96.6% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 52,649 psi | 90% | 3110 fps | 98.8% |
| Somchem S335ᴾ | <<locked>> | 100% | 42,250 psi | 72% | 2874 fps | 95.8% |
| Vihtavuori N110 | <<locked>> | 84% | 52,417 psi | 89% | 2894 fps | 100% |
| Vihtavuori N120 | <<locked>> | 94% | 51,619 psi | 88% | 3022 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 49,487 psi | 84% | 3002 fps | 99.4% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 42,859 psi | 73% | 2887 fps | 97.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 35,128 psi | 60% | 2812 fps | 95.9% |
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 1680 | <<locked>> | 80% | 37,652 psi | 64% | 2730 fps | 97.6% |
| Accurate 2015 | <<locked>> | 92% | 34,577 psi | 59% | 2746 fps | 95.6% |
| Accurate 2460 | <<locked>> | 98% | 46,209 psi | 79% | 2999 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 86% | 38,986 psi | 66% | 2746 fps | 95.2% |
| Accurate LT-32 | <<locked>> | 92% | 47,181 psi | 80% | 2900 fps | 95.1% |
| ADI AR 2205 | <<locked>> | 80% | 48,370 psi | 82% | 2831 fps | 100% |
| ADI AR 2207 | 26.2 gr | 80% | 33,272 psi | 57% | 2717 fps | 99.4% |
| ADI AR 2219 | 32.5 gr | 90% | 40,770 psi | 69% | 2913 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 88% | 28,326 psi | 48% | 2644 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 84% | 31,444 psi | 54% | 2687 fps | 95.8% |
| Alliant Reloder-7 | <<locked>> | 80% | 34,838 psi | 59% | 2710 fps | 97.4% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 39,566 psi | 67% | 2779 fps | 95.8% |
| Hodgdon H322 | <<locked>> | 92% | 39,697 psi | 68% | 2890 fps | 95% |
| Hodgdon H335 | <<locked>> | 96% | 45,992 psi | 78% | 3018 fps | 95.7% |
| Hodgdon H4198 | <<locked>> | 86% | 43,076 psi | 73% | 2844 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,669 psi | 39% | 1660 fps | 100% |
| IMR 3031 | <<locked>> | 98% | 36,912 psi | 63% | 2887 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 30,023 psi | 51% | 2592 fps | 96.1% |
| IMR 4227 | <<locked>> | 80% | 40,538 psi | 69% | 2792 fps | 99.7% |
| Lovex D060 | <<locked>> | 80% | 48,892 psi | 83% | 2982 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 92% | 47,456 psi | 81% | 3028 fps | 95% |
| Lovex S053 | <<locked>> | 80% | 39,769 psi | 68% | 2759 fps | 100% |
| Norma 200 | 27.4 gr | 80% | 31,227 psi | 53% | 2667 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,495 psi | 38% | 1699 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 40,234 psi | 68% | 2825 fps | 99.6% |
| Shooters World AR Plus | <<locked>> | 92% | 47,456 psi | 81% | 3028 fps | 95% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 48,892 psi | 83% | 2982 fps | 99.8% |
| Shooters World SOCOM | <<locked>> | 80% | 49,313 psi | 84% | 2946 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 37,231 psi | 63% | 2569 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 92% | 43,903 psi | 75% | 2976 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 36,318 psi | 62% | 2789 fps | 95.1% |
| Somchem S335 | <<locked>> | 98% | 39,668 psi | 68% | 2822 fps | 95% |
| Vihtavuori N110 | <<locked>> | 80% | 46,659 psi | 79% | 2808 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 33,489 psi | 57% | 2687 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 30,371 psi | 52% | 2595 fps | 95% |
| Vihtavuori N133 | <<locked>> | 92% | 33,852 psi | 58% | 2687 fps | 95% |
| Vihtavuori N135 | <<locked>> | 98% | 33,199 psi | 57% | 2762 fps | 95.1% |
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 59 powders for 6.8 mm Rem. SPC loaded with the .277 | 90gr | Speer TNT HP. Alliant Power Pro 1200-R delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,163 fps. Accurate 2015 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.277" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 2015, Accurate 2460, Accurate 2495 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. ADI AR 2219, Norma 200, ADI AR 2207 rank at the top here: for 6.8 mm Rem. SPC with the .277 | 90gr | Speer TNT HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2520, ADI Benchmark 8208, Alliant Power Pro 1200-R burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.