Under this post in my sig line you'll see links for clay ranges and rifle ranges. Click on the clays first then on the rifle ranges as some rifle ranges also cater for clays. This will give you a starting point for locations to try.

Semi autos are fine, but you only load two rounds at a time. Also make sure you have the bolt open and back when not shooting to show it's clear or even a breach flag.

As for misses. If you have a jam or misfire then you usually get another go, but make sure to raise your hand and call an RO who will walk you through the process of clearing any jam or help you with a misfire/hang fire.