Load Specifications
Bullet:.277 | 130gr | Geco EXPRESS
Bullet Manufacturer:Geco
Bullet Weight:130 gr
Bullet Diameter:0.277"
Bullet Length:<<locked>>
Caliber:.270 Win. load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:67 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.0
Load data in caliber .270 Win. with .277 | 130gr | Geco EXPRESS bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
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 2015 | <<locked>> | 82% | 55,840 psi | 90% | 2844 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,477 psi | 89% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,693 psi | 86% | 2874 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,282 psi | 74% | 2838 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 55,593 psi | 89% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,753 psi | 89% | 3018 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 55,216 psi | 89% | 2956 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,275 psi | 90% | 2956 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 2995 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,172 psi | 87% | 2907 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,158 psi | 88% | 2877 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,172 psi | 88% | 3081 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,113 psi | 85% | 2927 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,534 psi | 86% | 2946 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,156 psi | 85% | 3022 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,302 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2982 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,511 psi | 70% | 2861 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,356 psi | 79% | 3045 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,071 psi | 88% | 2969 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,896 psi | 86% | 2943 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,853 psi | 86% | 2917 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,651 psi | 89% | 2887 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,679 psi | 86% | 2933 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,418 psi | 87% | 2953 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 54,824 psi | 88% | 3015 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 54,984 psi | 88% | 2972 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 55,811 psi | 89% | 2966 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,055 psi | 85% | 2946 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,651 psi | 89% | 3002 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,216 psi | 89% | 3051 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,882 psi | 58% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,330 psi | 86% | 2913 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,159 psi | 90% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,796 psi | 89% | 2940 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,405 psi | 89% | 2920 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 54,273 psi | 87% | 2946 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,506 psi | 89% | 2946 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 56,260 psi | 90% | 3012 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 54,940 psi | 88% | 2979 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,172 psi | 87% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,143 psi | 88% | 2930 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,404 psi | 87% | 2881 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,767 psi | 89% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,158 psi | 88% | 2943 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 56,246 psi | 90% | 2979 fps | 98.5% |
| Norma 201 | <<locked>> | 84% | 54,114 psi | 87% | 2900 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,491 psi | 87% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 86% | 52,823 psi | 85% | 2936 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 55,027 psi | 88% | 2995 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 48,820 psi | 78% | 2992 fps | 96.9% |
| Norma URP | <<locked>> | 96% | 54,549 psi | 87% | 3005 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,417 psi | 86% | 2959 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 53,476 psi | 86% | 3002 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 54,201 psi | 87% | 2920 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,911 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,521 psi | 59% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,868 psi | 88% | 2940 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,056 psi | 87% | 3015 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,911 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,506 psi | 89% | 3041 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,404 psi | 87% | 3064 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 54,737 psi | 88% | 2881 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,636 psi | 88% | 2900 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,708 psi | 86% | 2936 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,387 psi | 82% | 2959 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 92% | 53,853 psi | 86% | 2917 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,158 psi | 88% | 2943 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,143 psi | 88% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,767 psi | 89% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,246 psi | 90% | 2979 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,622 psi | 89% | 3002 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,663 psi | 84% | 2897 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,519 psi | 86% | 2923 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,129 psi | 88% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,608 psi | 89% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,361 psi | 89% | 2894 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,937 psi | 82% | 2953 fps | 95.9% |
| Somchem S335 | <<locked>> | 84% | 54,824 psi | 88% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,057 psi | 90% | 2946 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,085 psi | 87% | 2936 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,895 psi | 85% | 3005 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,388 psi | 84% | 2943 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 55,463 psi | 89% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,621 psi | 88% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,114 psi | 88% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,550 psi | 89% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,490 psi | 86% | 2949 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 54,563 psi | 87% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,345 psi | 86% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,101 psi | 90% | 3005 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,559 psi | 78% | 2946 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,229 psi | 85% | 2920 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,636 psi | 88% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,824 psi | 88% | 3015 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,102 psi | 63% | 2881 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,679 psi | 86% | 2933 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% | 52,750 psi | 85% | 2802 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,426 psi | 73% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,253 psi | 76% | 2762 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 40,190 psi | 64% | 2717 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,004 psi | 69% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,418 psi | 55% | 2605 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 48,559 psi | 78% | 2844 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,365 psi | 66% | 2690 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 50,154 psi | 80% | 2930 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,662 psi | 81% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,996 psi | 83% | 2831 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,759 psi | 72% | 2890 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,365 psi | 66% | 2717 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,208 psi | 71% | 2779 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 34,069 psi | 55% | 2612 fps | 95.6% |
| Alliant Reloder-17 | 47.5 gr | 80% | 35,824 psi | 57% | 2687 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,284 psi | 79% | 2920 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,936 psi | 48% | 2520 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,941 psi | 59% | 2769 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,211 psi | 77% | 2854 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 41,234 psi | 66% | 2720 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 44,512 psi | 71% | 2746 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,127 psi | 84% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,198 psi | 80% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,887 psi | 67% | 2723 fps | 97.4% |
| Hodgdon H414 | 50 gr | 86% | 41,858 psi | 67% | 2772 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 48,327 psi | 77% | 2858 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,095 psi | 79% | 2858 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,617 psi | 47% | 2457 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,324 psi | 73% | 2828 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,353 psi | 71% | 2851 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 43% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,123 psi | 76% | 2808 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 49,284 psi | 79% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,453 psi | 70% | 2726 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,890 psi | 74% | 2749 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 44,933 psi | 72% | 2776 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,337 psi | 69% | 2726 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 33,330 psi | 53% | 2562 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 45,324 psi | 73% | 2812 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,662 psi | 81% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,356 psi | 78% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,196 psi | 77% | 2779 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,555 psi | 70% | 2730 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,261 psi | 61% | 2618 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 41,162 psi | 66% | 2700 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 47,529 psi | 76% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,095 psi | 77% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,584 psi | 70% | 2769 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 51,271 psi | 82% | 2933 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 42,699 psi | 68% | 2867 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 34,577 psi | 55% | 2608 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 43,555 psi | 70% | 2785 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 40,944 psi | 66% | 2762 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 50,778 psi | 81% | 2864 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,444 psi | 81% | 2881 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,293 psi | 68% | 2710 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,181 psi | 76% | 2894 fps | 99.3% |
| ReloadSwiss RS 60 | 47.5 gr | 80% | 38,087 psi | 61% | 2756 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,055 psi | 55% | 2621 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 36,143 psi | 58% | 2684 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 51,822 psi | 83% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,353 psi | 73% | 2746 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,754 psi | 62% | 2661 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 48,153 psi | 77% | 2900 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 44,512 psi | 71% | 2746 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,261 psi | 61% | 2618 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,356 psi | 78% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,555 psi | 70% | 2730 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,162 psi | 66% | 2700 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,798 psi | 64% | 2713 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,240 psi | 79% | 2838 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,137 psi | 76% | 2815 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,834 psi | 78% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,930 psi | 66% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,569 psi | 68% | 2671 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,688 psi | 76% | 2897 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 48,298 psi | 77% | 2736 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,081 psi | 79% | 2835 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 39,378 psi | 63% | 2664 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,993 psi | 46% | 2497 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 45,876 psi | 74% | 2825 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 49,255 psi | 79% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,237 psi | 73% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,484 psi | 73% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,521 psi | 60% | 2598 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 33,533 psi | 54% | 2549 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 50,952 psi | 82% | 2848 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,947 psi | 70% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,505 psi | 57% | 2608 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 32,532 psi | 52% | 2602 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,272 psi | 53% | 2526 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 51,053 psi | 82% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,119 psi | 68% | 2779 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,037 psi | 48% | 2608 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,891 psi | 75% | 2822 fps | 99.8% |
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 97 powders for .270 Win. loaded with the .277 | 130gr | Geco EXPRESS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,081 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,081 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.277" calls for a 1:12.0 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. Alliant Reloder-17, ReloadSwiss RS 60, Hodgdon H414 rank at the top here: for .270 Win. with the .277 | 130gr | Geco EXPRESS 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.