Load Specifications
Bullet:.277 | 130gr | RWS H-Mantel
Bullet Manufacturer:RWS
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:1:12.5
Load data in caliber .270 Win. with .277 | 130gr | RWS H-Mantel 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% | 56,217 psi | 90% | 2851 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,535 psi | 89% | 2881 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,983 psi | 87% | 2881 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,253 psi | 74% | 2838 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 55,608 psi | 89% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,115 psi | 90% | 3025 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 55,216 psi | 89% | 2959 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,289 psi | 90% | 2959 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,708 psi | 86% | 2995 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,186 psi | 87% | 2907 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,550 psi | 89% | 2881 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,463 psi | 89% | 3084 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,403 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,838 psi | 86% | 2953 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,185 psi | 85% | 3025 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,317 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,721 psi | 85% | 2982 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,714 psi | 70% | 2864 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,588 psi | 80% | 3048 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,347 psi | 89% | 2976 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,201 psi | 87% | 2949 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,853 psi | 86% | 2920 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,666 psi | 89% | 2887 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,693 psi | 86% | 2933 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,781 psi | 88% | 2963 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,766 psi | 88% | 3015 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 55,259 psi | 89% | 2982 fps | 97% |
| Hodgdon H4895 | <<locked>> | 84% | 55,840 psi | 90% | 2969 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,359 psi | 86% | 2953 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,970 psi | 90% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,172 psi | 88% | 3051 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 57% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,635 psi | 86% | 2920 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,188 psi | 90% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,811 psi | 89% | 2943 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,680 psi | 89% | 2927 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 54,563 psi | 87% | 2949 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,753 psi | 89% | 2953 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 56,260 psi | 90% | 3012 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,245 psi | 89% | 2986 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,186 psi | 87% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,506 psi | 89% | 2936 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,433 psi | 87% | 2881 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,086 psi | 90% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,448 psi | 89% | 2949 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 52,924 psi | 85% | 2927 fps | 98% |
| Norma 201 | <<locked>> | 84% | 54,114 psi | 87% | 2904 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,853 psi | 88% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,127 psi | 85% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,940 psi | 88% | 2995 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 49,037 psi | 79% | 2999 fps | 97% |
| Norma URP | <<locked>> | 96% | 54,882 psi | 88% | 3009 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,693 psi | 86% | 2966 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 53,403 psi | 86% | 3002 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 54,172 psi | 87% | 2923 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,201 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,390 psi | 58% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,824 psi | 88% | 2943 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,375 psi | 87% | 3022 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,940 psi | 86% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,825 psi | 90% | 3045 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,694 psi | 88% | 3071 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,114 psi | 88% | 2884 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,636 psi | 88% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,085 psi | 87% | 2943 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,735 psi | 83% | 2966 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 53,853 psi | 86% | 2920 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,448 psi | 89% | 2949 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,506 psi | 89% | 2936 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,086 psi | 90% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,924 psi | 85% | 2927 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,651 psi | 89% | 3002 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,953 psi | 85% | 2904 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,824 psi | 86% | 2927 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,143 psi | 88% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,912 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,259 psi | 89% | 2894 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,242 psi | 82% | 2963 fps | 96% |
| Somchem S335 | <<locked>> | 84% | 54,824 psi | 88% | 2838 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,405 psi | 90% | 2949 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,099 psi | 87% | 2936 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,243 psi | 85% | 3012 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,359 psi | 84% | 2943 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 55,506 psi | 89% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,636 psi | 88% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,114 psi | 88% | 2881 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,535 psi | 89% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,519 psi | 86% | 2949 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,563 psi | 87% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,359 psi | 86% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,086 psi | 90% | 3009 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,573 psi | 78% | 2946 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,534 psi | 86% | 2923 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,984 psi | 88% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,114 psi | 88% | 3022 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,349 psi | 63% | 2887 fps | 99.8% |
| 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% | 52,794 psi | 85% | 2805 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,788 psi | 73% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,239 psi | 76% | 2762 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 40,495 psi | 65% | 2726 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 43,294 psi | 69% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,476 psi | 55% | 2608 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 48,878 psi | 78% | 2851 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,394 psi | 66% | 2690 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 50,401 psi | 81% | 2936 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,981 psi | 82% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,040 psi | 83% | 2835 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,817 psi | 72% | 2894 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,423 psi | 66% | 2717 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,498 psi | 71% | 2785 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 34,316 psi | 55% | 2621 fps | 95.7% |
| Alliant Reloder-17 | 47.7 gr | 80% | 36,056 psi | 58% | 2694 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,559 psi | 79% | 2923 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,921 psi | 48% | 2523 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,664 psi | 56% | 2710 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,240 psi | 77% | 2858 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 41,481 psi | 67% | 2726 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 44,788 psi | 72% | 2753 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,446 psi | 84% | 2838 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,227 psi | 81% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,163 psi | 68% | 2733 fps | 97.5% |
| Hodgdon H414 | 50.1 gr | 86% | 41,872 psi | 67% | 2776 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 48,631 psi | 78% | 2864 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 49,414 psi | 79% | 2861 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,675 psi | 48% | 2461 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,614 psi | 73% | 2835 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,353 psi | 71% | 2851 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 43% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,181 psi | 76% | 2808 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 49,356 psi | 79% | 2848 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,482 psi | 70% | 2726 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,934 psi | 74% | 2753 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 45,165 psi | 72% | 2782 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,584 psi | 70% | 2730 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 33,344 psi | 53% | 2566 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 45,643 psi | 73% | 2818 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,981 psi | 82% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,356 psi | 78% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,225 psi | 77% | 2779 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,584 psi | 70% | 2730 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,276 psi | 61% | 2621 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 41,205 psi | 66% | 2703 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,834 psi | 77% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,153 psi | 77% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,888 psi | 70% | 2776 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 51,532 psi | 83% | 2940 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 42,743 psi | 69% | 2871 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 34,592 psi | 55% | 2608 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 43,555 psi | 70% | 2785 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 38,508 psi | 62% | 2710 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 50,792 psi | 81% | 2864 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,749 psi | 81% | 2887 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,322 psi | 68% | 2710 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,253 psi | 76% | 2897 fps | 99.3% |
| ReloadSwiss RS 60 | 47.7 gr | 80% | 38,348 psi | 61% | 2759 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,113 psi | 55% | 2621 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 36,172 psi | 58% | 2684 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 51,880 psi | 83% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,397 psi | 73% | 2746 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,059 psi | 63% | 2671 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 48,428 psi | 78% | 2907 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 44,788 psi | 72% | 2753 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,276 psi | 61% | 2621 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,356 psi | 78% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,584 psi | 70% | 2730 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,205 psi | 66% | 2703 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,842 psi | 64% | 2717 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,516 psi | 79% | 2844 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,152 psi | 76% | 2815 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,878 psi | 78% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,959 psi | 66% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,786 psi | 69% | 2674 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,950 psi | 77% | 2900 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,617 psi | 78% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,081 psi | 79% | 2835 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 39,639 psi | 64% | 2671 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 29,022 psi | 47% | 2500 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 45,876 psi | 74% | 2828 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 49,298 psi | 79% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,310 psi | 73% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,803 psi | 73% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,782 psi | 61% | 2605 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,794 psi | 54% | 2556 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 51,271 psi | 82% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,222 psi | 71% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,520 psi | 57% | 2612 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 32,576 psi | 52% | 2605 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,301 psi | 53% | 2530 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 51,372 psi | 82% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,105 psi | 68% | 2779 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,197 psi | 48% | 2612 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,920 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 | RWS H-Mantel. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,084 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 57–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.277" calls for a 1:12.5 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 | RWS H-Mantel 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.