I'd probably do it like this to avoid splitting and comparing items after a match is already found for a line:

while( <> ) {
    while(  /(\d+(?:\.\d+)?)/g  ) {
        if(  $1 ne '305.1' 
         &&  296.1 <= $1  &&  $1 <= 314.0  ) {
            print;
            last;
        }
    }
}
[download]

(updated slightly)