BANG! Mystery Cache

At the map above there are 35 x 35 squares (all in all 1225 squares). At the point in the middle of one of these squares is the cache located at  N55 42.??5 E12 34.??5.
The 1225 points goes from N55 42.005 E12 34.005 (low left corner) to N 55 42.345 E12 34.345 (top right corner). As an example the square (point) with the red cross is located at N55 42.065 E12 34.175

Now you just have to go ahead, 'shoot' and make your guess in Geocheck. If you 'shoot' correctly at the cache location, you will be told so in the Geocheck.
- and who knows "You might get lucky in your first shot!" 
Remember that you might be able to exclude many of the points in forhand by logical thinking and local knowledge.

Extra chance - bonus points:
Two of the 1225 coordinates are bonus points. If you find them in GeoCheck you will get information that will help you to easlier locate the correct point, where the cache is.
The two bonus point can be found in a smarter way other than just random shooting.
One of the bonus point can be found with this hint:
*1 Step 3 (align the coordinates to N55 42.??5 E 12 34.??5)
The second bonus point you'll have to figure out yourself.