If your targets are going to float away or submerge, you need to be far enough out to sea that dumping garbage isn't illegal.
You would have to assume that you would get ricochets.As unless the conditions were very calm wouldn't it be extremely difficult to shoot anything unless it was quite tall, and then you'd have the possibility of ricochets?
jgcoastie said:Follow the 4 rules. Obviously, shoot away from land.
Stay outside state waters.
Call your local Coast Guard Sector and ask if there are any designated firearm discharge zones in your local area.
Comply with all SOLAS regulations for your vessel length and distance from shore capabilities.