Load Specifications
Load data in caliber 6.8 Western with .277 | 130gr | NorthFork Bonded Core bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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 2495 | <<locked>> | 82% | 56,289 psi | 87% | 2946 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,464 psi | 88% | 3018 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 3064 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,797 psi | 87% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,146 psi | 89% | 3120 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 58,305 psi | 90% | 3215 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 86% | 56,768 psi | 87% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 58,798 psi | 90% | 3163 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 3156 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,217 psi | 86% | 3166 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,595 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,798 psi | 89% | 3087 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 58,639 psi | 90% | 3179 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,362 psi | 87% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,204 psi | 90% | 3150 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,550 psi | 85% | 3153 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 3081 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,556 psi | 70% | 2999 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,724 psi | 87% | 3228 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,937 psi | 78% | 3071 fps | 97.3% |
| Bofors RP3 | <<locked>> | 86% | 58,610 psi | 90% | 3077 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,550 psi | 85% | 3153 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 57,957 psi | 89% | 3068 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,274 psi | 85% | 3041 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,362 psi | 87% | 3114 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 55,985 psi | 86% | 3074 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 98% | 56,637 psi | 87% | 3097 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,521 psi | 85% | 3077 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,390 psi | 85% | 3041 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,594 psi | 87% | 3081 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,773 psi | 69% | 3031 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 90% | 56,913 psi | 88% | 3156 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 56% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,985 psi | 88% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,101 psi | 86% | 3018 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,085 psi | 85% | 2999 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 55,303 psi | 85% | 3038 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,101 psi | 86% | 3041 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 58,363 psi | 90% | 3107 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,651 psi | 86% | 3058 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,986 psi | 89% | 3084 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,940 psi | 83% | 3127 fps | 96.6% |
| Lovex S060 | <<locked>> | 82% | 57,638 psi | 89% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,304 psi | 87% | 3012 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,202 psi | 86% | 3035 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,537 psi | 89% | 3077 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,354 psi | 71% | 2904 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 57,566 psi | 89% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,334 psi | 90% | 3018 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,087 psi | 88% | 3071 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,202 psi | 86% | 3094 fps | 98% |
| Norma MRP | <<locked>> | 98% | 55,332 psi | 85% | 3179 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 56,420 psi | 87% | 3100 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,131 psi | 89% | 3097 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,505 psi | 84% | 3146 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 92% | 55,230 psi | 85% | 3100 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,588 psi | 75% | 3005 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,159 psi | 57% | 1962 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,100 psi | 85% | 3022 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,724 psi | 86% | 3140 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,827 psi | 89% | 3140 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,318 psi | 87% | 3169 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,831 psi | 69% | 3025 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 58,233 psi | 90% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 58,740 psi | 90% | 3074 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,797 psi | 87% | 3074 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 57,450 psi | 88% | 3136 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 57,957 psi | 89% | 3068 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,202 psi | 86% | 3035 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,304 psi | 87% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,537 psi | 89% | 3077 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,797 psi | 87% | 3084 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,638 psi | 89% | 3058 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,320 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,985 psi | 86% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,840 psi | 86% | 2986 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,971 psi | 88% | 3133 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 57,928 psi | 89% | 2943 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,581 psi | 90% | 3071 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,056 psi | 85% | 3005 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 55,898 psi | 86% | 3104 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,204 psi | 90% | 3110 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 84% | 58,711 psi | 90% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,390 psi | 85% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,304 psi | 87% | 2989 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 58,755 psi | 90% | 3097 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 3025 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 57,188 psi | 88% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,827 psi | 89% | 3100 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,682 psi | 90% | 3163 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,550 psi | 85% | 3169 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 58,349 psi | 90% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,594 psi | 87% | 3120 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,732 psi | 73% | 3143 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,711 psi | 89% | 3061 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 58,552 psi | 90% | 3104 fps | 98.4% |
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% | 52,953 psi | 81% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,473 psi | 78% | 2904 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 34,606 psi | 53% | 2648 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 50,183 psi | 77% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,348 psi | 59% | 2756 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 98% | 54,230 psi | 83% | 3143 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 47,166 psi | 73% | 2877 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,194 psi | 70% | 2917 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 96% | 49,487 psi | 76% | 3028 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,301 psi | 80% | 3100 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,601 psi | 73% | 2897 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,923 psi | 78% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,144 psi | 57% | 2766 fps | 98.1% |
| Alliant Reloder-17 | 55 gr | 80% | 42,424 psi | 65% | 2904 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,005 psi | 69% | 2910 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,424 psi | 65% | 2900 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,427 psi | 42% | 2503 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,215 psi | 54% | 2749 fps | 96% |
| Alliant Reloder-26 | 57.7 gr | 82% | 31,357 psi | 48% | 2677 fps | 95.1% |
| Bofors RP15 | <<locked>> | 96% | 44,672 psi | 69% | 2946 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,225 psi | 74% | 2913 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,424 psi | 65% | 2900 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,192 psi | 65% | 2772 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 48,356 psi | 74% | 2920 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 40,335 psi | 62% | 2805 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 43,207 psi | 66% | 2828 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,997 psi | 82% | 3035 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,938 psi | 80% | 3018 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,795 psi | 54% | 2654 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,823 psi | 81% | 3022 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,785 psi | 64% | 2956 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 39,276 psi | 60% | 2812 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 42% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,490 psi | 82% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,632 psi | 76% | 2913 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,750 psi | 80% | 2940 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 40,364 psi | 62% | 2753 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,685 psi | 67% | 2808 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,912 psi | 57% | 2707 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 52,228 psi | 80% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,169 psi | 79% | 2966 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 98% | 50,502 psi | 78% | 3061 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 54,186 psi | 83% | 2953 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,864 psi | 77% | 2910 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,263 psi | 63% | 2756 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 39,363 psi | 61% | 2733 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 35,897 psi | 55% | 2680 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 54,288 psi | 84% | 2972 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,723 psi | 84% | 2966 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,270 psi | 77% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,977 psi | 71% | 2910 fps | 95.7% |
| Norma MRP | <<locked>> | 88% | 38,841 psi | 60% | 2844 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 38,000 psi | 58% | 2749 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 50,705 psi | 78% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,166 psi | 73% | 3005 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 36,912 psi | 57% | 2733 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 42,047 psi | 65% | 2874 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,385 psi | 74% | 2904 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,078 psi | 69% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,101 psi | 59% | 2772 fps | 97.7% |
| ReloadSwiss RS 70 | 55.8 gr | 80% | 36,941 psi | 57% | 2779 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,928 psi | 60% | 2877 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 51,547 psi | 79% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,266 psi | 70% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,951 psi | 77% | 2953 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 90% | 44,019 psi | 68% | 2890 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,192 psi | 65% | 2772 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,263 psi | 63% | 2756 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,864 psi | 77% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,363 psi | 61% | 2733 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,441 psi | 71% | 2910 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,896 psi | 83% | 2999 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,940 psi | 85% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,543 psi | 72% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,292 psi | 62% | 2697 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,613 psi | 67% | 2884 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,723 psi | 84% | 2897 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,658 psi | 70% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,459 psi | 79% | 2946 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 34,519 psi | 53% | 2707 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 41,916 psi | 64% | 2815 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 52,040 psi | 80% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,011 psi | 80% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,453 psi | 67% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,450 psi | 61% | 2749 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 41,292 psi | 64% | 2792 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,285 psi | 77% | 2887 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,899 psi | 60% | 2749 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 30,284 psi | 47% | 2585 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 51,764 psi | 80% | 3100 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,653 psi | 59% | 2720 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 40,335 psi | 62% | 2805 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,889 psi | 40% | 2530 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,215 psi | 83% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,106 psi | 68% | 2854 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 96 powders for 6.8 Western loaded with the .277 | 130gr | NorthFork Bonded Core. Alliant Reloder-26 delivers the highest muzzle velocity at 3,228 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,228 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 130.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for 6.8 Western with the .277 | 130gr | NorthFork Bonded Core 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.