Load Specifications
Bullet:.277 | 100gr | Barnes Solid
Bullet Manufacturer:Barnes
Bullet Weight:100 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:1:11.0
Load data in caliber .270 Weath. Mag. with .277 | 100gr | Barnes Solid bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Ramshot Hunter.
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 2015 | <<locked>> | 82% | 57,217 psi | 90% | 3373 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,130 psi | 90% | 3399 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,564 psi | 87% | 3396 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,762 psi | 76% | 3343 fps | 97.6% |
| Accurate 4064 | <<locked>> | 88% | 57,392 psi | 90% | 3458 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,273 psi | 85% | 3491 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 84% | 56,637 psi | 89% | 3491 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,360 psi | 85% | 3432 fps | 99.7% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3530 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,317 psi | 87% | 3428 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,710 psi | 89% | 3406 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,334 psi | 90% | 3635 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3524 fps | 96.5% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3524 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,868 psi | 86% | 3458 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,172 psi | 86% | 3481 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,172 psi | 86% | 3563 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,695 psi | 89% | 3599 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 3514 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,556 psi | 71% | 3373 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3586 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,869 psi | 89% | 3504 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 55,825 psi | 87% | 3474 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,361 psi | 87% | 3438 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,637 psi | 89% | 3409 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,448 psi | 87% | 3461 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,492 psi | 89% | 3491 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 57,043 psi | 89% | 3553 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 56,782 psi | 89% | 3504 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 57,232 psi | 90% | 3504 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,347 psi | 87% | 3471 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,537 psi | 90% | 3540 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,711 psi | 90% | 3589 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,882 psi | 56% | 2221 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,795 psi | 86% | 3442 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,566 psi | 90% | 3484 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,261 psi | 90% | 3471 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,840 psi | 89% | 3445 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 56,318 psi | 88% | 3468 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,319 psi | 90% | 3478 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 54,868 psi | 86% | 3481 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 56,608 psi | 89% | 3517 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,317 psi | 87% | 3428 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,043 psi | 89% | 3461 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,593 psi | 87% | 3402 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,290 psi | 90% | 3465 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,014 psi | 89% | 3468 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,752 psi | 86% | 3448 fps | 98% |
| Norma 201 | <<locked>> | 84% | 55,274 psi | 87% | 3425 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,130 psi | 88% | 3428 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,447 psi | 85% | 3465 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 57,145 psi | 90% | 3524 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 51,576 psi | 81% | 3527 fps | 97.3% |
| Norma URP | <<locked>> | 96% | 56,782 psi | 89% | 3540 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 55,506 psi | 87% | 3491 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 55,695 psi | 87% | 3530 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 55,695 psi | 87% | 3445 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,796 psi | 87% | 3471 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 57% | 2270 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,507 psi | 89% | 3465 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,883 psi | 88% | 3556 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,130 psi | 88% | 3596 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,331 psi | 85% | 3510 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,058 psi | 89% | 3612 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,970 psi | 88% | 3409 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,072 psi | 88% | 3428 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,622 psi | 87% | 3465 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,896 psi | 84% | 3488 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 92% | 55,361 psi | 87% | 3438 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,014 psi | 89% | 3468 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,043 psi | 89% | 3461 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,290 psi | 90% | 3465 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,752 psi | 86% | 3448 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,624 psi | 90% | 3537 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,447 psi | 85% | 3419 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,129 psi | 86% | 3451 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,333 psi | 88% | 3356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,203 psi | 90% | 3353 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,290 psi | 90% | 3412 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 3481 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 55,927 psi | 88% | 3350 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,114 psi | 85% | 3409 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 55,898 psi | 88% | 3465 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,767 psi | 87% | 3543 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 3461 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 56,666 psi | 89% | 3337 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,869 psi | 88% | 3386 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,753 psi | 89% | 3402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,276 psi | 90% | 3435 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,376 psi | 87% | 3468 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 55,782 psi | 87% | 3428 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,897 psi | 86% | 3389 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,781 psi | 86% | 3474 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 3468 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,782 psi | 87% | 3438 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,434 psi | 88% | 3484 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,043 psi | 89% | 3553 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,379 psi | 65% | 3402 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,317 psi | 87% | 3461 fps | 100% |
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 2015 | <<locked>> | 80% | 53,838 psi | 84% | 3320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,847 psi | 73% | 3232 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,428 psi | 76% | 3258 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 42,134 psi | 66% | 3205 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 44,280 psi | 69% | 3225 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,505 psi | 56% | 3074 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,835 psi | 78% | 3363 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 42,380 psi | 66% | 3182 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 52,344 psi | 82% | 3458 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,909 psi | 81% | 3369 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,185 psi | 83% | 3350 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,209 psi | 72% | 3412 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 52,315 psi | 82% | 3455 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 52,315 psi | 82% | 3455 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,424 psi | 66% | 3212 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,411 psi | 71% | 3287 fps | 98.7% |
| Alliant Reloder-16 | 56.1 gr | 82% | 35,070 psi | 55% | 3091 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,130 psi | 58% | 3176 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,576 psi | 81% | 3445 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,951 psi | 49% | 2972 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,230 psi | 57% | 3189 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,647 psi | 78% | 3369 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 42,482 psi | 67% | 3215 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 45,803 psi | 72% | 3245 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,432 psi | 84% | 3356 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,735 psi | 81% | 3396 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,033 psi | 67% | 3219 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 86% | 43,381 psi | 68% | 3274 fps | 95% |
| Hodgdon H4350 | <<locked>> | 88% | 49,893 psi | 78% | 3369 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 50,343 psi | 79% | 3379 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,371 psi | 48% | 2904 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,789 psi | 73% | 3340 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 46,151 psi | 72% | 3356 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 42% | 1991 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,167 psi | 75% | 3317 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 50,459 psi | 79% | 3369 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,512 psi | 70% | 3225 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,963 psi | 74% | 3251 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 46,470 psi | 73% | 3278 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,498 psi | 70% | 3219 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 34,258 psi | 54% | 3022 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 46,557 psi | 73% | 3323 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 51,909 psi | 81% | 3369 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,734 psi | 78% | 3337 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,226 psi | 77% | 3287 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 44,599 psi | 70% | 3228 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 39,204 psi | 61% | 3094 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 45,339 psi | 71% | 3258 fps | 95.9% |
| Norma 201 | <<locked>> | 80% | 48,776 psi | 76% | 3307 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 49,298 psi | 77% | 3314 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,773 psi | 70% | 3271 fps | 99% |
| Norma 204 | <<locked>> | 94% | 53,447 psi | 84% | 3455 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 44,802 psi | 70% | 3379 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 35,578 psi | 56% | 3074 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 44,991 psi | 71% | 3291 fps | 99% |
| Ramshot Hunter | 63.8 gr | 88% | 42,424 psi | 66% | 3258 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 52,112 psi | 82% | 3379 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,098 psi | 82% | 3406 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 42% | 2037 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,366 psi | 68% | 3199 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,530 psi | 76% | 3419 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,508 psi | 62% | 3255 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 37,913 psi | 59% | 3159 fps | 95.9% |
| ReloadSwiss RS 70 | 62.9 gr | 84% | 37,521 psi | 59% | 3166 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 52,765 psi | 83% | 3356 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,398 psi | 73% | 3248 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 39,943 psi | 63% | 3150 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 50,328 psi | 79% | 3419 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 45,803 psi | 72% | 3245 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,204 psi | 61% | 3094 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,734 psi | 78% | 3337 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,599 psi | 70% | 3228 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 45,339 psi | 71% | 3258 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,973 psi | 64% | 3202 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,763 psi | 80% | 3353 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,327 psi | 76% | 3323 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,806 psi | 78% | 3248 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,843 psi | 66% | 3084 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,019 psi | 69% | 3156 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,864 psi | 78% | 3412 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,501 psi | 78% | 3241 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,517 psi | 79% | 3346 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,524 psi | 64% | 3153 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 29,820 psi | 47% | 2946 fps | 96.5% |
| Somchem S385 | <<locked>> | 96% | 47,964 psi | 75% | 3330 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 50,241 psi | 79% | 3235 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,296 psi | 73% | 3225 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,702 psi | 73% | 3232 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,609 psi | 61% | 3074 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 37,028 psi | 58% | 3081 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 52,214 psi | 82% | 3366 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,150 psi | 71% | 3215 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,680 psi | 57% | 3081 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 33,866 psi | 53% | 3068 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,301 psi | 54% | 2982 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 52,562 psi | 82% | 3422 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,569 psi | 68% | 3278 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 31,328 psi | 49% | 3074 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,356 psi | 76% | 3333 fps | 99.7% |
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 99 powders for .270 Weath. Mag. loaded with the .277 | 100gr | Barnes Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,635 fps; across all powders the maximum-charge window runs from 2,221 fps to 3,635 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 56–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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. Alliant Reloder-16, ReloadSwiss RS 70, Ramshot Hunter rank at the top here: for .270 Weath. Mag. with the .277 | 100gr | Barnes Solid 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.