I can think of 3 excellent LR bullets that are available, or soon will be, in .277":
- Berger EOL Hybrid 170gr
1.52" long
170 grains
Recommended twist 1:8.5"
Estimated G1 BC: 0.703
Estimated G7 BC: 0.360
- Matrix 165gr VLD
- Matrix 175gr VLD
That's 3 choices. If your rifle won't shoot one of the 3 bullets accurately, then I'd look to the loading techniques, other cartridge components, or the rifle itself. It wouldn't be hard to get an 8 or 9" twist tube made and twisted onto a decent action. I would think that any of these 3 high-BC .277" bullets would work fine in a standard .270 Win, assuming you used a mag that allowed bullets to be seated out nice and long, and a throat that accommodated same.
Here are a couple of our beloved charts *grin*, using JBM, of the 170gr Berger Hybrid (using the BC listed above), 140gr 6.5mm JLK VLD, and the 139gr Scenar:
6.5mm 140gr JLK VLD at 3050fps
600 yards
Drop (MOA)-9.0
Wind drift (MOA)3.0
Velocity 2195
1000 yards
Drop (MOA)-22.0
Wind drift (MOA)5.7
Velocity 1698
6.5mm 139gr Scenar at 3050fps
600 yards
Drop (MOA)-9.1
Wind drift (MOA)3.2
Velocity 2145
1000 yards
Drop (MOA)-22.8
Wind drift (MOA)6.2
Velocity 1624
.277 170gr EOL Hybrid at 2850fps
600 yards
Drop (MOA)-10
Wind drift (MOA)2.8
Velocity 2136
1000 yards
Drop (MOA)-23.8
Wind drift (MOA)5.2
Velocity 1712
And for comparison: