I shot my as-issued 03A3 in a couple of matches, but the stripper clips are a bit difficult to use, especially compared to those for the Swiss rifles.
The load first used in my K31 was a 153 gr. FP with a plain base (pictured above). I deliberately loaded it down so as to be subsonic. At our matches the big joke was we had to allow extra time after a string before we scored the targets. The RO's were afraid someone walking to the target stand might get there before the bullet from my last shot!
35W