Load Specifications
Load data in caliber .270 WSM with .277 | 130gr | Hornady SST bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Accurate High Country.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 56,507 psi | 89% | 3051 fps | 99.7% |
| Accurate 4350 | <<locked>> | 86% | 54,418 psi | 85% | 3041 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,217 psi | 88% | 3182 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 96% | 57,101 psi | 89% | 3179 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 82% | 54,911 psi | 86% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,971 psi | 89% | 3120 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 96% | 55,027 psi | 86% | 3120 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,192 psi | 66% | 2910 fps | 97% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,508 psi | 90% | 3123 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,536 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,971 psi | 89% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,810 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,768 psi | 89% | 3114 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,897 psi | 86% | 3123 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,666 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 3097 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,898 psi | 88% | 3202 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 3163 fps | 98.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 3025 fps | 96.1% |
| Bofors RP5 | <<locked>> | 96% | 54,897 psi | 86% | 3123 fps | 98.2% |
| Bofors RP7 | <<locked>> | 86% | 56,637 psi | 89% | 3028 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 3028 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 82% | 57,609 psi | 90% | 3058 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,129 psi | 86% | 3077 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 86% | 57,522 psi | 90% | 3084 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 94% | 54,853 psi | 86% | 3051 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,508 psi | 90% | 3097 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,389 psi | 85% | 3009 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,778 psi | 80% | 3150 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 86% | 54,679 psi | 86% | 3104 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 58% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,232 psi | 90% | 3058 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,319 psi | 90% | 3045 fps | 99.3% |
| IMR 4831 | <<locked>> | 90% | 57,493 psi | 90% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,289 psi | 88% | 3041 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 98% | 56,260 psi | 88% | 3153 fps | 97.2% |
| Lovex S065 | <<locked>> | 86% | 55,448 psi | 87% | 3002 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 56,826 psi | 89% | 3045 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3012 fps | 99.5% |
| Norma 204 | <<locked>> | 88% | 54,592 psi | 86% | 3051 fps | 97.8% |
| Norma MRP | <<locked>> | 94% | 54,302 psi | 85% | 3150 fps | 99.2% |
| Norma URP | <<locked>> | 88% | 55,535 psi | 87% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,710 psi | 89% | 3169 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 90% | 57,653 psi | 90% | 3120 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,071 psi | 86% | 3107 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,000 psi | 89% | 3035 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,099 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,159 psi | 90% | 3110 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,708 psi | 86% | 3130 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,184 psi | 80% | 3146 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 82% | 54,984 psi | 86% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,245 psi | 87% | 3031 fps | 97% |
| Rottweil R 905 | <<locked>> | 94% | 56,463 psi | 88% | 3104 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 86% | 56,637 psi | 89% | 3028 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,448 psi | 87% | 3002 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 88% | 56,826 psi | 89% | 3045 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,114 psi | 86% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,551 psi | 90% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,650 psi | 86% | 2946 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,985 psi | 88% | 3097 fps | 98.4% |
| Somchem S355 | <<locked>> | 84% | 57,740 psi | 90% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,072 psi | 89% | 3025 fps | 96.6% |
| Somchem S365 | <<locked>> | 90% | 55,405 psi | 87% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,392 psi | 90% | 3081 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 84% | 55,361 psi | 87% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,203 psi | 90% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,376 psi | 88% | 3048 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 88% | 56,797 psi | 89% | 3068 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,405 psi | 87% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,259 psi | 85% | 3130 fps | 96.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3114 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,275 psi | 88% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,129 psi | 86% | 3077 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,245 psi | 87% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,782 psi | 89% | 3064 fps | 98.3% |
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 3100 | <<locked>> | 80% | 35,027 psi | 55% | 2625 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 45,339 psi | 71% | 2877 fps | 99.4% |
| Accurate High Country | 60.3 gr | 88% | 46,499 psi | 73% | 2999 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 94% | 53,693 psi | 84% | 3120 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 51,764 psi | 81% | 2940 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 44,788 psi | 70% | 2890 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 48,544 psi | 76% | 2992 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 37,550 psi | 59% | 2789 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 42,525 psi | 67% | 2835 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,316 psi | 84% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,322 psi | 66% | 2864 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,008 psi | 75% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,192 psi | 66% | 2828 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 42,830 psi | 67% | 2887 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,837 psi | 51% | 2641 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,663 psi | 51% | 2648 fps | 95% |
| Alliant Reloder-26 | 56.5 gr | 80% | 35,360 psi | 55% | 2772 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 42,540 psi | 67% | 2881 fps | 95.1% |
| Bofors RP30 | <<locked>> | 98% | 45,266 psi | 71% | 2969 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 42,830 psi | 67% | 2887 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 47,616 psi | 75% | 2861 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 45,049 psi | 71% | 2907 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 54,375 psi | 85% | 3005 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 45,774 psi | 72% | 2904 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 48,080 psi | 75% | 2910 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 51,634 psi | 81% | 2995 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 50,676 psi | 79% | 2979 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,321 psi | 63% | 2753 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 42,453 psi | 67% | 2956 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 44,788 psi | 70% | 2917 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 44% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,888 psi | 67% | 2785 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,240 psi | 76% | 2881 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 42,830 psi | 67% | 2812 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 90% | 50,140 psi | 79% | 2930 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 49,603 psi | 78% | 3028 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 46,717 psi | 73% | 2844 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 45,237 psi | 71% | 2835 fps | 97.7% |
| Lovex S071 | <<locked>> | 84% | 34,403 psi | 54% | 2608 fps | 95.4% |
| Norma 204 | <<locked>> | 82% | 45,208 psi | 71% | 2874 fps | 95.7% |
| Norma MRP | 56.2 gr | 82% | 37,376 psi | 59% | 2785 fps | 95% |
| Norma URP | <<locked>> | 80% | 43,772 psi | 69% | 2851 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 46,615 psi | 73% | 2979 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 42,482 psi | 67% | 2838 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 90% | 39,726 psi | 62% | 2799 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,867 psi | 84% | 2982 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,575 psi | 79% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,469 psi | 70% | 2887 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,366 psi | 66% | 2887 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 39,581 psi | 62% | 2877 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 51,866 psi | 81% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 49,124 psi | 77% | 2923 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 41,727 psi | 65% | 2818 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 47,616 psi | 75% | 2861 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,717 psi | 73% | 2844 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 80% | 45,237 psi | 71% | 2835 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,011 psi | 82% | 2989 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,271 psi | 80% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,890 psi | 72% | 2785 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 43,932 psi | 69% | 2871 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 51,416 psi | 81% | 2933 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 50,473 psi | 79% | 2910 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 40,727 psi | 64% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 40,321 psi | 63% | 2756 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 49,153 psi | 77% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,107 psi | 71% | 2844 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 41,684 psi | 65% | 2776 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 44,730 psi | 70% | 2851 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 36,724 psi | 58% | 2726 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 92% | 51,155 psi | 80% | 3074 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 48,240 psi | 76% | 2999 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,845 psi | 69% | 2805 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,977 psi | 72% | 2907 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,776 psi | 47% | 2651 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 44,019 psi | 69% | 2835 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 76 powders for .270 WSM loaded with the .277 | 130gr | Hornady SST. Winchester StaBALL HD delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,245 fps. ADI AR 2225 gives the best case fill at 100 %, and 76 of the 76 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 130.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, Accurate High Country rank at the top here: for .270 WSM with the .277 | 130gr | Hornady SST 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.