Load Specifications
Load data in caliber .270 WSM with .277 | 130gr | Atomic 29 HP bullet and 75 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 Winchester StaBALL HD.
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% | 56,942 psi | 89% | 3058 fps | 99.8% |
| Accurate 4350 | <<locked>> | 86% | 54,810 psi | 86% | 3048 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,739 psi | 89% | 3192 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 55,216 psi | 87% | 2999 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,435 psi | 90% | 3130 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 96% | 55,492 psi | 87% | 3127 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,496 psi | 67% | 2917 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,740 psi | 90% | 3127 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,740 psi | 90% | 3127 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,840 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,305 psi | 90% | 3143 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,085 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,000 psi | 89% | 3117 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,419 psi | 87% | 3136 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,202 psi | 88% | 3117 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3114 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,536 psi | 89% | 3212 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,418 psi | 85% | 3114 fps | 98.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,428 psi | 76% | 3035 fps | 96.2% |
| Bofors RP5 | <<locked>> | 96% | 55,419 psi | 87% | 3136 fps | 98.4% |
| Bofors RP7 | <<locked>> | 86% | 56,942 psi | 89% | 3031 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3041 fps | 97% |
| Hodgdon H414 | <<locked>> | 86% | 55,463 psi | 87% | 3084 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 84% | 54,534 psi | 85% | 3031 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 94% | 55,347 psi | 87% | 3064 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,331 psi | 85% | 3045 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,766 psi | 86% | 3015 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,169 psi | 80% | 3159 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 86% | 55,230 psi | 87% | 3114 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,288 psi | 85% | 3009 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,636 psi | 86% | 3002 fps | 99.1% |
| IMR 4831 | <<locked>> | 88% | 54,708 psi | 86% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,695 psi | 89% | 3051 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 98% | 56,724 psi | 89% | 3163 fps | 97.4% |
| Lovex S065 | <<locked>> | 86% | 55,709 psi | 87% | 3009 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 57,145 psi | 90% | 3051 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3018 fps | 99.6% |
| Norma 204 | <<locked>> | 88% | 55,143 psi | 86% | 3064 fps | 97.9% |
| Norma MRP | <<locked>> | 94% | 54,824 psi | 86% | 3159 fps | 99.3% |
| Norma URP | <<locked>> | 88% | 55,898 psi | 88% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,276 psi | 90% | 3182 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 88% | 54,650 psi | 86% | 3074 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3117 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,043 psi | 60% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,522 psi | 90% | 3045 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,418 psi | 85% | 3100 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,696 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,172 psi | 86% | 3140 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 3153 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 82% | 55,347 psi | 87% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,767 psi | 87% | 3045 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 94% | 56,942 psi | 89% | 3114 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 86% | 56,942 psi | 89% | 3031 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,709 psi | 87% | 3009 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 88% | 57,145 psi | 90% | 3051 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,680 psi | 87% | 3048 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,520 psi | 85% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,158 psi | 86% | 2956 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,463 psi | 88% | 3110 fps | 98.5% |
| Somchem S355 | <<locked>> | 82% | 54,810 psi | 86% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,493 psi | 90% | 3031 fps | 96.7% |
| Somchem S365 | <<locked>> | 90% | 56,014 psi | 88% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,592 psi | 86% | 3035 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 84% | 55,608 psi | 87% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,201 psi | 85% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,840 psi | 89% | 3058 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 88% | 57,087 psi | 89% | 3074 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,941 psi | 88% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,737 psi | 86% | 3140 fps | 96.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,027 psi | 86% | 3123 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,797 psi | 89% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,680 psi | 87% | 3087 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,319 psi | 90% | 3074 fps | 98.4% |
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% | 35,273 psi | 55% | 2631 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 45,745 psi | 72% | 2887 fps | 99.5% |
| Accurate High Country | <<locked>> | 88% | 47,036 psi | 74% | 3009 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 52,098 psi | 82% | 2946 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 42,467 psi | 67% | 2838 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 48,950 psi | 77% | 3002 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 37,884 psi | 59% | 2799 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 42,815 psi | 67% | 2841 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 42,815 psi | 67% | 2841 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,650 psi | 84% | 2979 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,641 psi | 67% | 2871 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,559 psi | 76% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,467 psi | 67% | 2838 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 88% | 43,265 psi | 68% | 2897 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,098 psi | 52% | 2651 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,895 psi | 52% | 2657 fps | 95.2% |
| Alliant Reloder-26 | 56.9 gr | 80% | 35,563 psi | 56% | 2776 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 42,757 psi | 67% | 2884 fps | 95.2% |
| Bofors RP30 | <<locked>> | 98% | 45,701 psi | 72% | 2979 fps | 95.5% |
| Bofors RP5 | <<locked>> | 88% | 43,265 psi | 68% | 2897 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 47,906 psi | 75% | 2871 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 45,426 psi | 71% | 2920 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 46,079 psi | 72% | 2910 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,443 psi | 76% | 2920 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 52,141 psi | 82% | 3009 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,198 psi | 80% | 2989 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,625 psi | 64% | 2762 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 42,844 psi | 67% | 2969 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 45,063 psi | 71% | 2923 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 44% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,149 psi | 68% | 2792 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,515 psi | 76% | 2887 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 43,134 psi | 68% | 2822 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 90% | 50,575 psi | 79% | 2940 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 47,152 psi | 74% | 2979 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 47,021 psi | 74% | 2851 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 45,527 psi | 71% | 2841 fps | 97.8% |
| Lovex S071 | <<locked>> | 84% | 34,664 psi | 54% | 2615 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 42,917 psi | 67% | 2825 fps | 95% |
| Norma MRP | 56.7 gr | 82% | 37,782 psi | 59% | 2799 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 44,092 psi | 69% | 2858 fps | 99.3% |
| Ramshot Grand | <<locked>> | 92% | 47,094 psi | 74% | 2989 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 42,801 psi | 67% | 2844 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 90% | 40,132 psi | 63% | 2812 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,099 psi | 85% | 2989 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,184 psi | 80% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,802 psi | 70% | 2894 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,627 psi | 67% | 2894 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 37,608 psi | 59% | 2825 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 52,214 psi | 82% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 46,572 psi | 73% | 2874 fps | 95% |
| Rottweil R 905 | <<locked>> | 84% | 42,003 psi | 66% | 2828 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 47,906 psi | 75% | 2871 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,021 psi | 74% | 2851 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,527 psi | 71% | 2841 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,373 psi | 82% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,590 psi | 81% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,137 psi | 72% | 2792 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,698 psi | 65% | 2822 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 51,764 psi | 81% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 50,937 psi | 80% | 2920 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 41,060 psi | 64% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 40,611 psi | 64% | 2762 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 49,501 psi | 78% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,440 psi | 71% | 2854 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 42,119 psi | 66% | 2785 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,020 psi | 71% | 2858 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 37,043 psi | 58% | 2733 fps | 98.5% |
| Vihtavuori N560 | <<locked>> | 92% | 51,547 psi | 81% | 3081 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 96% | 48,704 psi | 76% | 3009 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,063 psi | 69% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,340 psi | 73% | 2913 fps | 97.9% |
| Winchester StaBALL HD | 54.7 gr | 80% | 30,008 psi | 47% | 2661 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 44,512 psi | 70% | 2844 fps | 95.7% |
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 75 powders for .270 WSM loaded with the .277 | 130gr | Atomic 29 HP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,258 fps. ADI AR 2225 gives the best case fill at 100 %, and 75 of the 75 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 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 130gr | Atomic 29 HP 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.