> My main question of concern before I go ahead and prototype this is,
should
> I be too concerned about the voltage drop changing across the resistor
as it
> heats up, or is the difference negligable ?  I am not too concerned with
> high resolution - even 1/8 or 1/4 amp resolution is fine for my
application.

So check the data sheet for the resistor (RTFM)!!

250mA out of 8A is about 3%.  The data sheet should be able to tell you if
the resistor is guaranteed to change by less than that over temperature or
not.  Then there is the issue of accuracy too, which you didn't mention.


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