Rookie scope sighting question

OK, not technically a rookie but the last time I messed with a scope was , well, lets just say a long time ago. I have a new Redfield 3X9 that put on a Mini 14 and at 25yds the scope adjustments are maxed out both vert and horiz and POI is still a couple inches from POA. In the directions they talk about rezeroing AFTER you get it sighted in where you want it.. My question is, can I rezero the adjustments and then continue adjusting until I get it dialed in or do I have to shim the mount? Thanks...

If you're using Ruger rings, you might have them reversed. Try putting the rear ring on the front and see what happens.

Its an aftermarket side mount, not ruger rings.

I guess my question is - once you max out scope adjustment (clicker) can you just reset the zero by turning the ring that goes around the base of the adjustmunt (clicker) and then keep adjusting more in the same direction until you get where you need to, or is there an internal limit on how far you can move a crosshair in one direction?

I install scopes pretty often as I move them from rifle to rifle to rifle trying to determine the optimal pairing. Don't know why. Just enjoy tinkering.
Anyway, some thoughts:
1. Remove your scope and rings and start over. When tightening a bolt, tighten it partially and then tighten the counter bolt. Your base and rings installation can ruin your set up if not square and plumb. Go slowly. I recommend blue loctitie.
2. Have your scope adjustments in a "neutral" setting. By this I mean start with the windage and elevation dials at their mid point.
I don't know your particular scope so the internal limit question gets a probably. I have always assumed that scopes do limit your adjustments. The ability to lift the dial and turn it without clicking is just allowing you to set your dial on zero without affecting the elevation and windage adjustments you have already made. At least that is what I have believed for a long time and could be wrong. I hate reading directions/instructions:D

yes, there is a limit to how much you can adjust a scope. redfield says you get 56" of play at 100 yds. http://www.redfield.com/_media/downloads/Revolution_3-9x40mm.pdf

My first guess is your side mount is no good. my distant 2nd guess is your scope is out of spec. (it happens. I had it on a vortex viper)

can I rezero the adjustments and then continue adjusting until I get it dialed in or do I have to shim the mount?
If you've gone as far as the turret lets you, and are still a "couple inches" off at 25 yds, you either have the wrong mounting system, or it's incorrectly installed.
Shims are not required.