Load Specifications
Load data in caliber .270 WSM with .277 | 129gr | Barnes LRX BT bullet and 82 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 ReloadSwiss RS 70.
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 2700 | <<locked>> | 82% | 56,579 psi | 89% | 3005 fps | 98.7% |
| Accurate 3100 | <<locked>> | 98% | 56,202 psi | 88% | 3064 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 57,522 psi | 90% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,433 psi | 85% | 3061 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 56,608 psi | 89% | 3205 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 55,825 psi | 87% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,404 psi | 85% | 3091 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 98% | 55,550 psi | 87% | 3140 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,520 psi | 85% | 3087 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,101 psi | 89% | 3054 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,246 psi | 90% | 3077 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,508 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,274 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,290 psi | 90% | 3136 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,085 psi | 86% | 3146 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,776 psi | 76% | 3061 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,188 psi | 88% | 3225 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,998 psi | 85% | 3127 fps | 97.9% |
| Bofors RP3 | <<locked>> | 82% | 55,114 psi | 86% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,085 psi | 86% | 3146 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 57,145 psi | 90% | 3054 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 54,781 psi | 86% | 3031 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 55,680 psi | 87% | 3104 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 86% | 55,042 psi | 86% | 3058 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 96% | 55,709 psi | 87% | 3084 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,665 psi | 86% | 3064 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,926 psi | 86% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,776 psi | 75% | 3100 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 88% | 55,593 psi | 87% | 3136 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 58% | 1926 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,347 psi | 87% | 3005 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,566 psi | 90% | 3038 fps | 99.3% |
| IMR 4350 | <<locked>> | 90% | 54,737 psi | 86% | 3031 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,955 psi | 86% | 3022 fps | 99% |
| IMR 4831 | <<locked>> | 90% | 54,433 psi | 85% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,217 psi | 90% | 3074 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3176 fps | 97.2% |
| Lovex S062 | <<locked>> | 82% | 55,985 psi | 88% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,927 psi | 88% | 3028 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 57,334 psi | 90% | 3074 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 2972 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 56,637 psi | 89% | 3061 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,303 psi | 87% | 3081 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 54,665 psi | 86% | 3173 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 56,072 psi | 88% | 3094 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,305 psi | 90% | 3084 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3199 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 90% | 54,607 psi | 86% | 3091 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,837 psi | 81% | 3068 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,433 psi | 85% | 3012 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,868 psi | 86% | 3127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,421 psi | 90% | 3136 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,259 psi | 87% | 3156 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 3097 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 84% | 55,201 psi | 87% | 3018 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,840 psi | 88% | 3058 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 56,739 psi | 89% | 3127 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 57,145 psi | 90% | 3054 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,927 psi | 88% | 3028 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 55,985 psi | 88% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,334 psi | 90% | 3074 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,028 psi | 88% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,100 psi | 86% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,245 psi | 87% | 2972 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,260 psi | 88% | 3120 fps | 98.3% |
| Somchem S355 | <<locked>> | 84% | 54,824 psi | 86% | 3012 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,244 psi | 85% | 2992 fps | 95.8% |
| Somchem S365 | <<locked>> | 92% | 55,695 psi | 87% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,346 psi | 85% | 3048 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 86% | 55,941 psi | 88% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,447 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3071 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 56,420 psi | 88% | 2979 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,290 psi | 90% | 3094 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,347 psi | 87% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,708 psi | 86% | 3156 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,406 psi | 90% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,912 psi | 88% | 3107 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,634 psi | 81% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,653 psi | 90% | 3094 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 2700 | <<locked>> | 80% | 53,316 psi | 84% | 2949 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 36,172 psi | 57% | 2677 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 54,230 psi | 85% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,134 psi | 66% | 2835 fps | 98.9% |
| Accurate High Country | <<locked>> | 90% | 46,572 psi | 73% | 3018 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 49,676 psi | 78% | 2920 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 45,063 psi | 71% | 2913 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 48,994 psi | 77% | 3018 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 45,310 psi | 71% | 2913 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,633 psi | 79% | 2949 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,940 psi | 85% | 3022 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,856 psi | 62% | 2828 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,223 psi | 71% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,860 psi | 70% | 2907 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,699 psi | 67% | 2904 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,269 psi | 47% | 2589 fps | 97.2% |
| Alliant Reloder-25 | <<locked>> | 88% | 34,040 psi | 53% | 2710 fps | 95.5% |
| Alliant Reloder-26 | 56.1 gr | 80% | 32,518 psi | 51% | 2710 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 44,817 psi | 70% | 2949 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 51,561 psi | 81% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,699 psi | 67% | 2904 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 45,092 psi | 71% | 2831 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 51,517 psi | 81% | 2976 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 43,091 psi | 68% | 2864 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,629 psi | 72% | 2881 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 52,286 psi | 82% | 3025 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,256 psi | 80% | 3005 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,797 psi | 59% | 2720 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,322 psi | 66% | 2969 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 42,235 psi | 66% | 2877 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 44% | 1726 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,286 psi | 82% | 2956 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,186 psi | 85% | 2982 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 40,509 psi | 63% | 2753 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,166 psi | 72% | 2858 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 40,016 psi | 63% | 2776 fps | 98.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 50,749 psi | 80% | 2959 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 96% | 50,009 psi | 78% | 3051 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,997 psi | 83% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,106 psi | 69% | 2812 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 42,511 psi | 67% | 2795 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 35,346 psi | 55% | 2657 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 53,330 psi | 84% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,672 psi | 72% | 2904 fps | 95.7% |
| Norma MRP | 58.5 gr | 86% | 39,378 psi | 62% | 2858 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 41,060 psi | 64% | 2815 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 53,679 psi | 84% | 3028 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,775 psi | 73% | 2995 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,856 psi | 62% | 2799 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 94% | 42,264 psi | 66% | 2877 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,271 psi | 80% | 2953 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,805 psi | 75% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,495 psi | 65% | 2844 fps | 98.6% |
| ReloadSwiss RS 70 | 55.6 gr | 80% | 39,813 psi | 62% | 2848 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,407 psi | 62% | 2887 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 48,762 psi | 76% | 2913 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,617 psi | 78% | 2946 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 44,266 psi | 69% | 2894 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,092 psi | 71% | 2831 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,106 psi | 69% | 2812 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 52,997 psi | 83% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,511 psi | 67% | 2795 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,356 psi | 77% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,878 psi | 77% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,308 psi | 68% | 2753 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,903 psi | 69% | 2890 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,588 psi | 76% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,937 psi | 80% | 2933 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,811 psi | 59% | 2779 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 39,914 psi | 63% | 2766 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 46,485 psi | 73% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,438 psi | 67% | 2812 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 41,568 psi | 65% | 2792 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,214 psi | 83% | 2930 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,003 psi | 66% | 2815 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 33,852 psi | 53% | 2677 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 94% | 51,387 psi | 81% | 3094 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,379 psi | 65% | 2776 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 43,323 psi | 68% | 2871 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,282 psi | 43% | 2579 fps | 96.6% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,121 psi | 69% | 2851 fps | 95.4% |
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 82 powders for .270 WSM loaded with the .277 | 129gr | Barnes LRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,225 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,225 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 82 of the 82 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 129.0 gr projectile in 0.277" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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, ReloadSwiss RS 70 rank at the top here: for .270 WSM with the .277 | 129gr | Barnes LRX BT 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.