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Derek, the Owner's Manual from Crimson Trace states the green laser is a 1/2 inch circle at 50 feet, but they don't give a maximum effective range beyond that.
Derek, How far would your target be at in a defensive protecting your life situation? That is the effective range of a laser. Any further then that the laser is a toy. With that being said a rail-mounted laser will shine on the target within about 3 inches of your point-of-impact (POI) all the way out to around 50 yards, depending on your load, of course.
Derek, the Red laser will be about 40yds on a non bright day and 15yds on a bright sunny day. I would highly recommend getting the Green Laser version for superior performance in all conditions.
40 yards or so indoors outside mine is good to about 10 yards