Bremen, you are correct, FMJ is not allowed in metallic silhouette due to its tendency to damage targets. Even just cratering targets is frowned upon, it can lead to people cutting their hands when standing targets.
Jacketed hollow points and soft points are usually fine. In lever-gun silhouette, which I assume you are looking at, just run a very mild load. It has been found that stoking your loads up to maximum, just leads to gun failures. ( Esp. Marlins
Never go to the line with a Marlin without an appropriate screwdriver in your pocket ) If you are reloading, try cast bullets, your own or a commercial hard-cast variety.
If this is for the pistol calibre event, the furthest target is only 100m. Even for the rifle class, the rams at 200m can easily be reached with mild loads.
You have to remember that these guns are mostly based on designs from the late 1800's and black-powder velocities. Even "modern" models are still held together with quite small screws that are only using about 3 to 4 threads. With the repetition of match shooting they tend to rattle screws loose, the hotter your loads, the more you'll be tightening things up.