I have used 145 ELD-X in a Winchester Model 70 270Win (22" barrel). The factory loads grouped well, but seemed to be significantly slower (~2850 fps) than advertised at around 0 degrees C (they got about the advertised velocity around 20 degrees C (~2975 fps)). My reloads with H4831SC were able to achieve some incredible (and consistent) velocities (~3100 fps) and grouped comparably to the factory ammunition. However, I seem to have a chronic instability issues (key holes) and I wasn't able to get them anywhere near the lands due to the magazine length.
I shot one whitetail buck with them at about 200 yards. The deer died quite quickly, but the bullet whistled right through with amazingly little damage to the boiler room; very small wound channel and exit hole (no red soup).
I think they are alright, but I have more accurate loads with other bullets so I think I am about done with them.
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