Load Specifications
Load data in caliber .270 Win. with .277 | 140gr | Norma Tipstrike bullet and 99 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-16 and Hodgdon Superformance.
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>> | 84% | 53,055 psi | 85% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,766 psi | 88% | 2789 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,210 psi | 76% | 2756 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 53,417 psi | 86% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,447 psi | 86% | 2877 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 56,289 psi | 90% | 2861 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,056 psi | 87% | 2815 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2907 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,027 psi | 88% | 2808 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,405 psi | 90% | 2776 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,231 psi | 90% | 2986 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,346 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,781 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,288 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,390 psi | 89% | 2963 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,635 psi | 86% | 2894 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,469 psi | 71% | 2779 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,102 psi | 63% | 2680 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2959 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,246 psi | 90% | 2877 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,085 psi | 88% | 2851 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,636 psi | 88% | 2825 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,376 psi | 90% | 2785 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,708 psi | 88% | 2838 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,637 psi | 89% | 2864 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 55,869 psi | 90% | 2927 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 92% | 56,028 psi | 90% | 2887 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 53,403 psi | 86% | 2818 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,360 psi | 87% | 2854 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,040 psi | 85% | 2851 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,115 psi | 90% | 2963 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 58% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,331 psi | 87% | 2818 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,795 psi | 86% | 2799 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,417 psi | 86% | 2795 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,231 psi | 90% | 2828 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 55,463 psi | 89% | 2858 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,200 psi | 85% | 2805 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 53,809 psi | 86% | 2867 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 56,159 psi | 90% | 2884 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,027 psi | 88% | 2808 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,953 psi | 85% | 2785 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,216 psi | 89% | 2782 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,476 psi | 86% | 2792 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,086 psi | 90% | 2851 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 53,954 psi | 87% | 2838 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,392 psi | 63% | 2608 fps | 96.2% |
| Norma 201 | <<locked>> | 84% | 55,027 psi | 88% | 2805 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,477 psi | 89% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,012 psi | 87% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,173 psi | 90% | 2910 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 49,966 psi | 80% | 2913 fps | 97.8% |
| Norma URP | <<locked>> | 96% | 55,854 psi | 90% | 2913 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 54,433 psi | 87% | 2867 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,650 psi | 88% | 2913 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 55,158 psi | 88% | 2828 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,216 psi | 89% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,666 psi | 59% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,767 psi | 89% | 2848 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,477 psi | 89% | 2923 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,187 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 52,997 psi | 85% | 2897 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,811 psi | 89% | 2982 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,028 psi | 90% | 2785 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,593 psi | 89% | 2805 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,897 psi | 88% | 2844 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2877 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 54,636 psi | 88% | 2825 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,086 psi | 90% | 2851 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,953 psi | 85% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,476 psi | 86% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,954 psi | 87% | 2838 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,953 psi | 85% | 2851 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,983 psi | 87% | 2812 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,708 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,115 psi | 90% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,461 psi | 86% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,405 psi | 90% | 2805 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,170 psi | 84% | 2874 fps | 96.9% |
| Somchem S335 | <<locked>> | 84% | 55,680 psi | 89% | 2736 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,476 psi | 86% | 2799 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,114 psi | 88% | 2841 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,215 psi | 87% | 2913 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,403 psi | 86% | 2858 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 53,301 psi | 85% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,550 psi | 89% | 2766 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,246 psi | 90% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,924 psi | 85% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,694 psi | 88% | 2858 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,521 psi | 89% | 2808 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,288 psi | 87% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,708 psi | 86% | 2864 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,777 psi | 80% | 2858 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,505 psi | 87% | 2831 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,898 psi | 90% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,869 psi | 90% | 2927 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,045 psi | 64% | 2812 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,752 psi | 88% | 2838 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2792 fps | 96.1% |
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% | 46,717 psi | 75% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,020 psi | 72% | 2621 fps | 95.8% |
| Accurate 3100 | <<locked>> | 92% | 36,071 psi | 58% | 2536 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,237 psi | 71% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,880 psi | 53% | 2477 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 49,617 psi | 80% | 2756 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,105 psi | 68% | 2605 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,153 psi | 77% | 2795 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,692 psi | 83% | 2756 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,055 psi | 85% | 2733 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,832 psi | 73% | 2808 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,264 psi | 68% | 2631 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,208 psi | 72% | 2697 fps | 99.4% |
| Alliant Reloder-16 | 42.6 gr | 80% | 32,851 psi | 53% | 2490 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,622 psi | 59% | 2612 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,166 psi | 76% | 2782 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,805 psi | 46% | 2405 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,680 psi | 59% | 2621 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,025 psi | 53% | 2575 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,052 psi | 79% | 2766 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,279 psi | 68% | 2641 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 42,583 psi | 68% | 2612 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,026 psi | 85% | 2736 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,343 psi | 82% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,946 psi | 69% | 2648 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 40,089 psi | 64% | 2638 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 46,311 psi | 74% | 2720 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,111 psi | 80% | 2766 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,284 psi | 49% | 2388 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,325 psi | 74% | 2743 fps | 100% |
| Hodgdon Superformance | 52.1 gr | 86% | 42,206 psi | 68% | 2710 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,095 psi | 77% | 2717 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,299 psi | 81% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,266 psi | 71% | 2641 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,572 psi | 75% | 2661 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 43,076 psi | 69% | 2644 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,669 psi | 67% | 2592 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 31,850 psi | 51% | 2434 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 46,340 psi | 74% | 2726 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 51,692 psi | 83% | 2756 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,327 psi | 79% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,994 psi | 79% | 2687 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,382 psi | 71% | 2641 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,709 psi | 59% | 2490 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 39,523 psi | 63% | 2572 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 36,767 psi | 59% | 2552 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 48,675 psi | 78% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,052 psi | 79% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,556 psi | 71% | 2684 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 48,965 psi | 79% | 2792 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 40,785 psi | 65% | 2730 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 32,996 psi | 53% | 2474 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,599 psi | 72% | 2703 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,738 psi | 59% | 2572 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 51,590 psi | 83% | 2772 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,517 psi | 83% | 2792 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 44% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,120 psi | 69% | 2628 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,211 psi | 77% | 2805 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,957 psi | 62% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,576 psi | 52% | 2490 fps | 95.2% |
| ReloadSwiss RS 70 | 47.7 gr | 82% | 34,505 psi | 55% | 2549 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 52,605 psi | 84% | 2733 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,180 psi | 74% | 2654 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,682 psi | 64% | 2582 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 96% | 45,992 psi | 74% | 2762 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,583 psi | 68% | 2612 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,709 psi | 59% | 2490 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,327 psi | 79% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,382 psi | 71% | 2641 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,523 psi | 63% | 2572 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,683 psi | 65% | 2631 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,328 psi | 81% | 2753 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,993 psi | 77% | 2723 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,516 psi | 79% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,582 psi | 67% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,785 psi | 65% | 2539 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,556 psi | 73% | 2756 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,443 psi | 79% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,893 psi | 80% | 2743 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,422 psi | 65% | 2589 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,747 psi | 48% | 2431 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 43,903 psi | 70% | 2690 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,995 psi | 80% | 2631 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,093 psi | 74% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,441 psi | 74% | 2638 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,348 psi | 61% | 2520 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,389 psi | 55% | 2480 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 80% | 52,025 psi | 83% | 2756 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,976 psi | 72% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,040 psi | 55% | 2480 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 31,372 psi | 50% | 2480 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,866 psi | 54% | 2451 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 52,127 psi | 84% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,089 psi | 64% | 2638 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,006 psi | 43% | 2418 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,892 psi | 77% | 2733 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,862 psi | 75% | 2736 fps | 95.2% |
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 116 powders for .270 Win. loaded with the .277 | 140gr | Norma Tipstrike. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,986 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 140.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 140gr | Norma Tipstrike they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.