Load Specifications
Load data in caliber 6.8 Western with .277 | 140gr | Sierra GameKing bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Accurate High Country.
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 2495 | <<locked>> | 82% | 58,407 psi | 90% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,753 psi | 86% | 2894 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3005 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,317 psi | 85% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,463 psi | 87% | 2992 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,999 psi | 86% | 3094 fps | 98% |
| Accurate MAGPRO | <<locked>> | 98% | 56,753 psi | 87% | 3094 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 86% | 58,494 psi | 90% | 2959 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,203 psi | 88% | 3038 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 98% | 55,129 psi | 85% | 3038 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,942 psi | 58% | 2740 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,581 psi | 90% | 3094 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,566 psi | 89% | 3038 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,159 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,275 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,261 psi | 88% | 3051 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,769 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,768 psi | 87% | 3031 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 3097 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 3015 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,659 psi | 73% | 2946 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,332 psi | 85% | 3104 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 3015 fps | 98.4% |
| Bofors RP3 | <<locked>> | 84% | 56,942 psi | 88% | 2949 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 3097 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 56,231 psi | 87% | 2940 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,239 psi | 73% | 2884 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 84% | 57,203 psi | 88% | 2969 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,450 psi | 90% | 3045 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 58,059 psi | 89% | 3005 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 96% | 55,230 psi | 85% | 2979 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,885 psi | 89% | 3022 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,479 psi | 88% | 2966 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,653 psi | 90% | 3002 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,659 psi | 72% | 2989 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 88% | 55,085 psi | 85% | 3028 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 56% | 1847 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,073 psi | 89% | 2943 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,956 psi | 88% | 2930 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 57,450 psi | 88% | 2976 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,914 psi | 89% | 2969 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 56,782 psi | 87% | 2982 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,754 psi | 89% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,420 psi | 87% | 2966 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,130 psi | 86% | 3071 fps | 97.8% |
| Lovex S062 | <<locked>> | 84% | 58,334 psi | 90% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,189 psi | 90% | 2966 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,043 psi | 86% | 2956 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,733 psi | 75% | 2851 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 55,622 psi | 86% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,378 psi | 90% | 3031 fps | 98.8% |
| Norma MRP | <<locked>> | 98% | 57,943 psi | 89% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 58,769 psi | 90% | 3031 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,362 psi | 87% | 2969 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,942 psi | 88% | 3094 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 57,421 psi | 88% | 3031 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,908 psi | 78% | 2959 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,000 psi | 88% | 2953 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,305 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,492 psi | 87% | 3015 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,708 psi | 84% | 3045 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,963 psi | 72% | 2986 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 82% | 56,782 psi | 87% | 2897 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,101 psi | 88% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,143 psi | 85% | 2953 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 55,999 psi | 86% | 3015 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 56,231 psi | 87% | 2940 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,189 psi | 90% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,334 psi | 90% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,043 psi | 86% | 2956 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,042 psi | 85% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,566 psi | 89% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,580 psi | 89% | 2917 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,593 psi | 86% | 3012 fps | 98.7% |
| Somchem S355 | <<locked>> | 86% | 56,884 psi | 88% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,942 psi | 88% | 2946 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 58,668 psi | 90% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,811 psi | 87% | 2992 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 57,246 psi | 88% | 2851 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,334 psi | 88% | 2867 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,291 psi | 90% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,029 psi | 88% | 2969 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,173 psi | 86% | 2966 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 55,477 psi | 85% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,260 psi | 87% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,493 psi | 88% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,957 psi | 89% | 3110 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2953 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,652 psi | 87% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,726 psi | 90% | 3051 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,155 psi | 79% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,840 psi | 87% | 2986 fps | 98.7% |
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 2495 | <<locked>> | 80% | 54,984 psi | 85% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,069 psi | 80% | 2835 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 34,011 psi | 52% | 2549 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 52,127 psi | 80% | 2828 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,176 psi | 62% | 2707 fps | 99% |
| Accurate High Country | 60.4 gr | 90% | 45,194 psi | 70% | 2897 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 94% | 49,327 psi | 76% | 2963 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 48,733 psi | 75% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,176 psi | 63% | 2740 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 94% | 48,167 psi | 74% | 2913 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 98% | 35,563 psi | 55% | 2674 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,476 psi | 84% | 3031 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,394 psi | 64% | 2743 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,356 psi | 76% | 2828 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,808 psi | 81% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,682 psi | 60% | 2710 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,251 psi | 68% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,959 psi | 63% | 2733 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,597 psi | 64% | 2792 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,645 psi | 44% | 2464 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,372 psi | 50% | 2589 fps | 95.7% |
| Alliant Reloder-26 | 55.3 gr | 80% | 30,618 psi | 47% | 2575 fps | 95.7% |
| Bofors RP15 | <<locked>> | 92% | 41,031 psi | 63% | 2776 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,922 psi | 77% | 2841 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,597 psi | 64% | 2792 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,671 psi | 67% | 2713 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 98% | 44,135 psi | 68% | 2822 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,256 psi | 77% | 2858 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,916 psi | 64% | 2749 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 80% | 44,657 psi | 69% | 2769 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 48,022 psi | 74% | 2854 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,268 psi | 73% | 2841 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,376 psi | 56% | 2602 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 55,013 psi | 85% | 2949 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,915 psi | 63% | 2854 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 41,002 psi | 63% | 2766 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 42% | 1647 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,285 psi | 79% | 2841 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,447 psi | 82% | 2874 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 39,334 psi | 61% | 2641 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,179 psi | 70% | 2746 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 38,522 psi | 59% | 2654 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 54,172 psi | 83% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,847 psi | 72% | 2795 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 46,050 psi | 71% | 2884 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,576 psi | 79% | 2835 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,772 psi | 66% | 2697 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 40,886 psi | 63% | 2677 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 33,127 psi | 51% | 2526 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 52,141 psi | 80% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,655 psi | 64% | 2730 fps | 95.3% |
| Norma MRP | 57.8 gr | 86% | 38,116 psi | 59% | 2743 fps | 96% |
| Norma URP | <<locked>> | 80% | 39,653 psi | 61% | 2697 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 52,634 psi | 81% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 45,861 psi | 71% | 2890 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 38,595 psi | 59% | 2684 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 92% | 38,058 psi | 59% | 2700 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 43% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,241 psi | 77% | 2844 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,963 psi | 72% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,827 psi | 61% | 2720 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,421 psi | 59% | 2730 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,855 psi | 58% | 2772 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 53,258 psi | 82% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,079 psi | 72% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,571 psi | 70% | 2779 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 40,147 psi | 62% | 2720 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,671 psi | 67% | 2713 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,772 psi | 66% | 2697 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 51,576 psi | 79% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,886 psi | 63% | 2677 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,399 psi | 74% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,008 psi | 74% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,800 psi | 64% | 2638 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,769 psi | 61% | 2710 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 47,340 psi | 73% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 49,951 psi | 77% | 2828 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 36,274 psi | 56% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,189 psi | 59% | 2644 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 53,824 psi | 83% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,809 psi | 83% | 2818 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,092 psi | 69% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,147 psi | 63% | 2697 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 90% | 40,248 psi | 62% | 2680 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 52,098 psi | 80% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,553 psi | 62% | 2697 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 31,850 psi | 49% | 2543 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 92% | 47,181 psi | 73% | 2920 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 98% | 46,543 psi | 72% | 2894 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,147 psi | 62% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,119 psi | 65% | 2753 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,353 psi | 39% | 2438 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,089 psi | 62% | 2684 fps | 95% |
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 93 powders for 6.8 Western loaded with the .277 | 140gr | Sierra GameKing. Norma MRP delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,120 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.277" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2225, Alliant Reloder-22 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. Norma MRP, Alliant Reloder-26, Accurate High Country rank at the top here: for 6.8 Western with the .277 | 140gr | Sierra GameKing 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.