Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 156gr | Sako Hammerhead bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand 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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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 56,753 psi | 89% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,201 psi | 85% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,303 psi | 87% | 3002 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 90% | 54,955 psi | 86% | 2936 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 56,492 psi | 89% | 3002 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2900 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,339 psi | 71% | 2867 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,998 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,217 psi | 88% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,462 psi | 85% | 2923 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,565 psi | 89% | 2995 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,244 psi | 85% | 2910 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 3025 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,215 psi | 85% | 2992 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,534 psi | 85% | 2904 fps | 96.9% |
| Bofors RP15 | <<locked>> | 96% | 55,477 psi | 87% | 2979 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 2972 fps | 99.4% |
| Bofors RP5 | <<locked>> | 94% | 56,565 psi | 89% | 2995 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 56,260 psi | 88% | 2871 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 2986 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 55,767 psi | 87% | 2930 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,621 psi | 86% | 2884 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 56,318 psi | 88% | 2936 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,230 psi | 87% | 2920 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,448 psi | 87% | 2851 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,144 psi | 88% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,304 psi | 88% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,650 psi | 86% | 2864 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,725 psi | 90% | 2894 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,592 psi | 86% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,087 psi | 89% | 2913 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 54,201 psi | 85% | 2976 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,785 psi | 64% | 2766 fps | 97% |
| Lovex S065 | <<locked>> | 84% | 55,158 psi | 86% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,594 psi | 89% | 2890 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 54,302 psi | 85% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,448 psi | 87% | 2917 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 40,843 psi | 64% | 2792 fps | 99% |
| Norma MRP | <<locked>> | 92% | 56,304 psi | 88% | 3015 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,101 psi | 88% | 2907 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,013 psi | 86% | 2999 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 55,056 psi | 86% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,406 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,145 psi | 60% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,273 psi | 85% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,217 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,913 psi | 89% | 3100 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2989 fps | 98.3% |
| Rottweil R 904 | <<locked>> | 90% | 55,941 psi | 88% | 2900 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 92% | 57,624 psi | 90% | 2966 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 56,260 psi | 88% | 2871 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,158 psi | 86% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,594 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,464 psi | 90% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,740 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,217 psi | 90% | 2966 fps | 99.9% |
| Somchem S355 | <<locked>> | 82% | 57,377 psi | 90% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,493 psi | 90% | 2894 fps | 99% |
| Somchem S365 | <<locked>> | 88% | 56,768 psi | 89% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,563 psi | 86% | 2884 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,984 psi | 86% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,331 psi | 85% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,595 psi | 90% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 57,232 psi | 90% | 2907 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,507 psi | 89% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,086 psi | 88% | 3012 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 98% | 55,970 psi | 88% | 2992 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 2992 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,580 psi | 90% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,999 psi | 88% | 2933 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,985 psi | 88% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,230 psi | 85% | 2881 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 35,491 psi | 56% | 2523 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 47,427 psi | 74% | 2769 fps | 100% |
| Accurate MAGPRO | 61.2 gr | 84% | 41,597 psi | 65% | 2746 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 39,450 psi | 62% | 2648 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 37,521 psi | 59% | 2631 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 38,754 psi | 61% | 2661 fps | 96% |
| ADI AR 2225 | <<locked>> | 88% | 30,719 psi | 48% | 2507 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,179 psi | 71% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,214 psi | 82% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,508 psi | 62% | 2644 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,331 psi | 55% | 2585 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,040 psi | 53% | 2549 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,617 psi | 46% | 2461 fps | 97.2% |
| Alliant Reloder-26 | 59 gr | 80% | 37,333 psi | 59% | 2694 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 48,167 psi | 75% | 2789 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 35,070 psi | 55% | 2579 fps | 95.8% |
| Bofors RP30 | <<locked>> | 88% | 35,215 psi | 55% | 2615 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 35,331 psi | 55% | 2585 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 49,617 psi | 78% | 2762 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 34,766 psi | 54% | 2566 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 48,878 psi | 77% | 2815 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 51,430 psi | 81% | 2831 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 40,118 psi | 63% | 2641 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 39,334 psi | 62% | 2621 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,801 psi | 67% | 2654 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 32,880 psi | 52% | 2602 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 48,486 psi | 76% | 2844 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 44% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,223 psi | 71% | 2703 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,053 psi | 80% | 2789 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 44,918 psi | 70% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,305 psi | 62% | 2585 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 84% | 38,812 psi | 61% | 2674 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 35,752 psi | 56% | 2648 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,747 psi | 76% | 2740 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,079 psi | 74% | 2736 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 30,560 psi | 48% | 2398 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 45,353 psi | 71% | 2746 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 31,314 psi | 49% | 2552 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,840 psi | 58% | 2651 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 46,383 psi | 73% | 2753 fps | 100% |
| Ramshot Grand | 58.2 gr | 82% | 35,766 psi | 56% | 2618 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 45,223 psi | 71% | 2753 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 31,937 psi | 50% | 2497 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 45% | 1657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,268 psi | 74% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,295 psi | 71% | 2805 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 29,791 psi | 47% | 2507 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 41,191 psi | 65% | 2789 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 40,770 psi | 64% | 2625 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 80% | 38,711 psi | 61% | 2625 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 49,617 psi | 78% | 2762 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,747 psi | 76% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,079 psi | 74% | 2736 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,041 psi | 85% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,659 psi | 75% | 2690 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,377 psi | 60% | 2621 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 54,027 psi | 85% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,321 psi | 65% | 2612 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 43,482 psi | 68% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,436 psi | 62% | 2612 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 80% | 51,735 psi | 81% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,805 psi | 75% | 2746 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,171 psi | 54% | 2487 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 47,166 psi | 74% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,174 psi | 60% | 2625 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,798 psi | 62% | 2703 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 37,376 psi | 59% | 2638 fps | 95% |
| Vihtavuori N568 | <<locked>> | 94% | 42,641 psi | 67% | 2802 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,717 psi | 73% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,124 psi | 77% | 2822 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,313 psi | 48% | 2579 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,897 psi | 56% | 2533 fps | 96.1% |
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 78 powders for .270 Weath. Mag. loaded with the .277 | 156gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,107 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 156.0 gr projectile in 0.277" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Accurate MAGPRO, Ramshot Grand, Alliant Reloder-26 rank at the top here: for .270 Weath. Mag. with the .277 | 156gr | Sako Hammerhead they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.