I have a custom .280 (not improved) that I have been shooting for several years. We have never used anything but standard brass. Rem.- Win. I bought a 100 rounds of nickel back at the first of this year and have been shooting with these and I can't seem to tell any difference. I don't know about the excessive wear on reloading dies.
just another comment: the loading tool i use is the collet die from lee.
it kinda squeezes the neck down by mashing it against a mandrel.
the builder of the rifle recommended it, so that's what i use, it works and that's okay