If it's your first time, I'd recommend against polishing an alloy frame feedramp (i.e. Kimber CDP).
If, ONTH, it's steel, 'snot hard at all. Cruise on over to Brownell's (dot com) and check the stuff out. Lots of good advice on the site as well.
If I had your background, I might not be dissauded by an easily "reduced by too much" allow ramp. Only you know.
That said(c), has the feedramp been a problem, or is this a "pre-emptive" tuning issue?
The old advice is still the best: If it t'aint broke, don't fix it...
I've got a pantload of Brownell's parts and have been real happy with the results, but there were some, unh, learning experiences in there...