It is the competitors responsibility to know the rules. Here are some rules that are good to know.

Whatever classification you have attained, you can shoot that class in ANY NRA competition. For example: You have made marksman indoor pistol shooting. You can shoot any NRA match, small bore, high power etc. in that class.

Look at each target before you hang them. Look for holes, the proper target for that event; slow, timed, rapid, the correct distance target. Make sure your name or competitor number is on each target, when required.

Score your targets as you pull them to verify posted scores.

Outdoors make sure the score on the scoresheet is correct. Check addition.

Verify your scores in the time allotted to make sure they are correct. Believe me when I tell you how frustrating it is to shoot better than you ever have and find the posted scores are wrong and the time limit is up to challenge it.