Load Specifications
Bullet:.277 | 122gr | Hasler ARIETE
Bullet Manufacturer:Hasler
Bullet Weight:122 gr
Bullet Diameter:0.277"
Bullet Length:<<locked>>
Caliber:.270 Weath. Mag. load data
Case Length (l3):2.549"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:82 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:10.0
Load data in caliber .270 Weath. Mag. with .277 | 122gr | Hasler ARIETE bullet and 99 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-26 and Hodgdon Superformance.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 57,740 psi | 90% | 3120 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,898 psi | 88% | 3146 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3182 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 54,592 psi | 86% | 3127 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,695 psi | 87% | 3241 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,550 psi | 89% | 3343 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 82% | 57,464 psi | 90% | 3219 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,288 psi | 87% | 3169 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,377 psi | 90% | 3297 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3284 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,534 psi | 85% | 3301 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,825 psi | 87% | 3189 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,057 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,681 psi | 89% | 3307 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,520 psi | 85% | 3278 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,405 psi | 88% | 3278 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3278 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 3205 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 3114 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,563 psi | 86% | 3356 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,667 psi | 90% | 3238 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 3189 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 56,724 psi | 89% | 3209 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3278 fps | 98.1% |
| Bofors RP7 | <<locked>> | 90% | 56,289 psi | 88% | 3196 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 57,116 psi | 90% | 3228 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,563 psi | 86% | 3241 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 54,346 psi | 85% | 3199 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 98% | 55,056 psi | 86% | 3225 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3268 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,000 psi | 89% | 3219 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,752 psi | 86% | 3209 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,897 psi | 86% | 3281 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 57% | 2018 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,593 psi | 87% | 3176 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,433 psi | 85% | 3146 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,363 psi | 90% | 3189 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 57,493 psi | 90% | 3232 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,433 psi | 85% | 3163 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 56,347 psi | 88% | 3235 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,508 psi | 90% | 3245 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,695 psi | 89% | 3215 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,301 psi | 82% | 3251 fps | 96.4% |
| Lovex S060 | <<locked>> | 82% | 55,956 psi | 88% | 3133 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,708 psi | 86% | 3143 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,491 psi | 85% | 3159 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 55,840 psi | 88% | 3205 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,382 psi | 70% | 3012 fps | 98.3% |
| Norma 201 | <<locked>> | 82% | 55,970 psi | 88% | 3156 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,840 psi | 89% | 3153 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,303 psi | 87% | 3199 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,650 psi | 86% | 3225 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3373 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 54,708 psi | 86% | 3232 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,362 psi | 88% | 3228 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,489 psi | 82% | 3264 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 57,348 psi | 90% | 3291 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,789 psi | 73% | 3120 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,159 psi | 90% | 3212 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,363 psi | 90% | 3294 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,751 psi | 84% | 3264 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,869 psi | 88% | 3268 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,491 psi | 85% | 3301 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,989 psi | 67% | 3133 fps | 97.3% |
| Rottweil R 902 | <<locked>> | 84% | 56,623 psi | 89% | 3153 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,826 psi | 89% | 3202 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,056 psi | 86% | 3196 fps | 97% |
| Rottweil R 905 | <<locked>> | 98% | 55,579 psi | 87% | 3261 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 56,289 psi | 88% | 3196 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,491 psi | 85% | 3159 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,708 psi | 86% | 3143 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,840 psi | 88% | 3205 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,056 psi | 86% | 3212 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,970 psi | 88% | 3186 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,637 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,375 psi | 85% | 3028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,070 psi | 85% | 3107 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,085 psi | 86% | 3255 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 56,521 psi | 89% | 3074 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,608 psi | 89% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,130 psi | 90% | 3189 fps | 96.6% |
| Somchem S365 | <<locked>> | 94% | 54,056 psi | 85% | 3232 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,130 psi | 88% | 3232 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 57,203 psi | 90% | 3054 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,927 psi | 89% | 3107 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,406 psi | 90% | 3123 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,665 psi | 86% | 3117 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,695 psi | 89% | 3222 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3143 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 55,709 psi | 87% | 3120 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,883 psi | 88% | 3225 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3291 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3360 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,826 psi | 89% | 3186 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,839 psi | 86% | 3248 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,803 psi | 72% | 3264 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,188 psi | 88% | 3192 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3228 fps | 98.3% |
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 2495 | <<locked>> | 80% | 50,444 psi | 79% | 3012 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,936 psi | 77% | 3022 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 35,085 psi | 55% | 2802 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,819 psi | 75% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,405 psi | 57% | 2858 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 98% | 52,402 psi | 82% | 3268 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 53,766 psi | 84% | 3159 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,600 psi | 71% | 2995 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,816 psi | 69% | 3035 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 47,892 psi | 75% | 3146 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,546 psi | 79% | 3228 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,992 psi | 72% | 3022 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,240 psi | 77% | 3097 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,781 psi | 56% | 2877 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,770 psi | 64% | 3018 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,352 psi | 68% | 3025 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,642 psi | 68% | 3077 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,760 psi | 44% | 2654 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,736 psi | 53% | 2851 fps | 95.6% |
| Alliant Reloder-26 | 61.3 gr | 84% | 32,068 psi | 50% | 2844 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,780 psi | 84% | 3173 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 43,033 psi | 67% | 3061 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,253 psi | 72% | 3031 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,642 psi | 68% | 3077 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,683 psi | 64% | 2887 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,746 psi | 73% | 3045 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,624 psi | 61% | 2913 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,684 psi | 65% | 2946 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 51,314 psi | 80% | 3156 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,328 psi | 79% | 3136 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 52% | 2756 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,126 psi | 80% | 3150 fps | 100% |
| Hodgdon Superformance | 61.7 gr | 82% | 40,596 psi | 64% | 2992 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,977 psi | 42% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,996 psi | 81% | 3117 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,964 psi | 75% | 3035 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,270 psi | 79% | 3064 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 39,030 psi | 61% | 2867 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,337 psi | 66% | 2927 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 35,027 psi | 55% | 2808 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 50,517 psi | 79% | 3130 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,864 psi | 78% | 3091 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 48,718 psi | 76% | 3179 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 52,620 psi | 82% | 3077 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,037 psi | 75% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,552 psi | 62% | 2864 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 37,753 psi | 59% | 2838 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 33,997 psi | 53% | 2776 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,330 psi | 82% | 3097 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,113 psi | 83% | 3097 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,573 psi | 76% | 3084 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,367 psi | 70% | 3025 fps | 95.4% |
| Norma MRP | <<locked>> | 88% | 37,173 psi | 58% | 2956 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,405 psi | 57% | 2861 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 48,979 psi | 77% | 3104 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 48,762 psi | 76% | 3189 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,418 psi | 56% | 2841 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 40,364 psi | 63% | 2979 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,499 psi | 43% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,876 psi | 73% | 3025 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,476 psi | 84% | 3232 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,381 psi | 68% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,332 psi | 57% | 2877 fps | 97.4% |
| ReloadSwiss RS 70 | 57.8 gr | 80% | 35,360 psi | 55% | 2884 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,074 psi | 63% | 3058 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 78% | 3048 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,410 psi | 68% | 2969 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 48,486 psi | 76% | 3077 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 42,235 psi | 66% | 3002 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,683 psi | 64% | 2887 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,552 psi | 62% | 2864 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 48,037 psi | 75% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,753 psi | 59% | 2838 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,889 psi | 70% | 3031 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,417 psi | 82% | 3130 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,403 psi | 84% | 3028 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,078 psi | 71% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,725 psi | 61% | 2802 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,843 psi | 66% | 2995 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,953 psi | 83% | 3022 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,772 psi | 69% | 2969 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 53,461 psi | 84% | 3127 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 32,793 psi | 51% | 2808 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 40,132 psi | 63% | 2923 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 54,012 psi | 85% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,227 psi | 79% | 3009 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,430 psi | 79% | 3018 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,858 psi | 66% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,840 psi | 59% | 2861 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 42,337 psi | 66% | 2956 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 48,791 psi | 76% | 3012 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,333 psi | 59% | 2861 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 28,369 psi | 44% | 2671 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 96% | 50,067 psi | 78% | 3222 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,115 psi | 58% | 2828 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,798 psi | 61% | 2920 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,150 psi | 41% | 2680 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,518 psi | 82% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,641 psi | 67% | 2969 fps | 95.1% |
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 99 powders for .270 Weath. Mag. loaded with the .277 | 122gr | Hasler ARIETE. Norma MRP delivers the highest muzzle velocity at 3,373 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,373 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 122.0 gr projectile in 0.277" calls for a 1:10.0 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-26, Hodgdon Superformance rank at the top here: for .270 Weath. Mag. with the .277 | 122gr | Hasler ARIETE 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.