And there is "shooter" and "shooter".
You can shoot a couple of magazines on your Birthaday and the 4th of July. That is shooting of course, but it does not qualify as "shooter" in my book.
My 2 "shooters", both Mauser made, a 1941 and a 1938 have had their "collector" value brought down by added markings. But I do shoot them more than the average "shooter".