Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Sierra SBT GameKing bullet and 100 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 Alliant Reloder-26.
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% | 53,185 psi | 85% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,433 psi | 87% | 2707 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2743 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 53,592 psi | 86% | 2697 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,824 psi | 86% | 2792 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,057 psi | 90% | 2769 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,766 psi | 86% | 2726 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,795 psi | 88% | 2831 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,475 psi | 84% | 2822 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,391 psi | 90% | 2894 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,375 psi | 87% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,708 psi | 88% | 2769 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,447 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,767 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,070 psi | 87% | 2822 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,097 psi | 82% | 2818 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2759 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,119 psi | 68% | 2680 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2946 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,840 psi | 90% | 2785 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2743 fps | 96.5% |
| Bofors RP3 | <<locked>> | 86% | 55,129 psi | 88% | 2762 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,097 psi | 82% | 2818 fps | 97.6% |
| Bofors RP7 | <<locked>> | 90% | 54,708 psi | 88% | 2746 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 55,564 psi | 89% | 2779 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,057 psi | 90% | 2844 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 55,970 psi | 90% | 2802 fps | 98.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2825 fps | 96.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2808 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,897 psi | 88% | 2776 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,214 psi | 85% | 2762 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,260 psi | 90% | 2884 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,303 psi | 58% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,085 psi | 87% | 2726 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,185 psi | 85% | 2707 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,767 psi | 89% | 2740 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 55,347 psi | 89% | 2776 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,289 psi | 90% | 2772 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 54,070 psi | 87% | 2785 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,101 psi | 90% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,404 psi | 87% | 2762 fps | 96.2% |
| Lovex D073.6 | <<locked>> | 82% | 56,217 psi | 90% | 2740 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,766 psi | 88% | 2694 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,359 psi | 86% | 2700 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,260 psi | 90% | 2769 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 53,911 psi | 86% | 2756 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,699 psi | 68% | 2595 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 54,766 psi | 88% | 2713 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,288 psi | 89% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,012 psi | 87% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,202 psi | 90% | 2828 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2900 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 56,028 psi | 90% | 2828 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,534 psi | 87% | 2779 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,980 psi | 80% | 2802 fps | 96% |
| Ramshot Hunter | <<locked>> | 94% | 54,911 psi | 88% | 2831 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,353 psi | 71% | 2680 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,608 psi | 89% | 2766 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,361 psi | 89% | 2831 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,187 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,447 psi | 86% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,970 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,002 psi | 66% | 2690 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 84% | 55,347 psi | 89% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,998 psi | 88% | 2756 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 52,997 psi | 85% | 2749 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 53,214 psi | 85% | 2805 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 54,708 psi | 88% | 2746 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,260 psi | 90% | 2769 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,217 psi | 90% | 2740 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,359 psi | 86% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,911 psi | 86% | 2756 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,069 psi | 85% | 2766 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,086 psi | 90% | 2628 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,244 psi | 87% | 2740 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,593 psi | 89% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,289 psi | 90% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,057 psi | 90% | 2723 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 2858 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 55,347 psi | 89% | 2644 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,071 psi | 88% | 2753 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,636 psi | 88% | 2743 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 55,100 psi | 88% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,954 psi | 87% | 2785 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 56,086 psi | 90% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,463 psi | 89% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,057 psi | 90% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,347 psi | 90% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,824 psi | 88% | 2776 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,690 psi | 80% | 2707 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 84% | 54,186 psi | 87% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,911 psi | 86% | 2782 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,911 psi | 86% | 2835 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2890 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,186 psi | 87% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,362 psi | 90% | 2848 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,468 psi | 70% | 2812 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,389 psi | 87% | 2746 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 2776 fps | 97.7% |
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% | 49,777 psi | 80% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,805 psi | 77% | 2598 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 34,229 psi | 55% | 2418 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 47,137 psi | 76% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,752 psi | 57% | 2467 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 80% | 52,678 psi | 84% | 2720 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,773 psi | 72% | 2575 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,150 psi | 72% | 2664 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 49,153 psi | 79% | 2762 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,878 psi | 78% | 2776 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,918 psi | 72% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,211 psi | 77% | 2664 fps | 99.9% |
| Alliant Reloder-16 | 43 gr | 80% | 34,998 psi | 56% | 2474 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,407 psi | 63% | 2595 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,916 psi | 67% | 2605 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,785 psi | 67% | 2644 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,628 psi | 41% | 2238 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,793 psi | 53% | 2454 fps | 95.1% |
| Alliant Reloder-26 | 49.8 gr | 84% | 30,995 psi | 50% | 2451 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,228 psi | 84% | 2733 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 43,947 psi | 70% | 2687 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 45,107 psi | 72% | 2608 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,785 psi | 67% | 2644 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,885 psi | 64% | 2480 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 45,600 psi | 73% | 2618 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 37,608 psi | 60% | 2510 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 43,236 psi | 69% | 2582 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 98% | 52,518 psi | 84% | 2766 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,561 psi | 83% | 2753 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,489 psi | 52% | 2372 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,632 psi | 80% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,320 psi | 63% | 2575 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 44% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,792 psi | 81% | 2677 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,094 psi | 76% | 2608 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,298 psi | 79% | 2635 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 40,495 psi | 65% | 2516 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,321 psi | 66% | 2513 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 34,461 psi | 55% | 2425 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 49,429 psi | 79% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,126 psi | 82% | 2710 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 52,707 psi | 85% | 2694 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,764 psi | 83% | 2648 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,311 psi | 76% | 2608 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,914 psi | 62% | 2467 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 37,188 psi | 60% | 2448 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 35,288 psi | 57% | 2444 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 51,430 psi | 82% | 2664 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,909 psi | 83% | 2661 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,558 psi | 76% | 2654 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,786 psi | 69% | 2598 fps | 95% |
| Norma MRP | <<locked>> | 90% | 38,363 psi | 62% | 2602 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,650 psi | 57% | 2464 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 47,471 psi | 76% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,673 psi | 75% | 2740 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 34,505 psi | 55% | 2444 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 41,437 psi | 66% | 2621 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 44% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,629 psi | 73% | 2602 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,837 psi | 83% | 2779 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,872 psi | 67% | 2651 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,375 psi | 57% | 2484 fps | 97.3% |
| ReloadSwiss RS 70 | 47 gr | 80% | 34,461 psi | 55% | 2484 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,218 psi | 61% | 2625 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,066 psi | 79% | 2618 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,656 psi | 68% | 2559 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,876 psi | 75% | 2644 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 43,627 psi | 70% | 2638 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 39,885 psi | 64% | 2480 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,914 psi | 62% | 2467 fps | 97.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,707 psi | 85% | 2694 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,311 psi | 76% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,188 psi | 60% | 2448 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,627 psi | 70% | 2608 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,968 psi | 85% | 2585 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,995 psi | 82% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,446 psi | 84% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,251 psi | 71% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,971 psi | 61% | 2408 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,221 psi | 69% | 2635 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,040 psi | 83% | 2598 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,004 psi | 69% | 2556 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,401 psi | 82% | 2690 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,039 psi | 51% | 2418 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 38,914 psi | 62% | 2516 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 52,968 psi | 85% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,255 psi | 79% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,414 psi | 79% | 2598 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,060 psi | 66% | 2490 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,086 psi | 59% | 2464 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 40,799 psi | 65% | 2546 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 47,587 psi | 76% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,419 psi | 58% | 2464 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,920 psi | 45% | 2310 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 98% | 50,966 psi | 82% | 2828 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,143 psi | 58% | 2434 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 37,826 psi | 61% | 2513 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,686 psi | 41% | 2316 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,097 psi | 82% | 2697 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,918 psi | 70% | 2608 fps | 95.5% |
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 108 powders for .270 Win. loaded with the .277 | 150gr | Sierra SBT GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 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-16, Alliant Reloder-26 rank at the top here: for .270 Win. with the .277 | 150gr | Sierra SBT GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.