Listed below are some of the most broken NSRA Rules and their associated penalties:
5.2.1: 2 shots on one diagram, but correct number on card – 1 point penalty
5.2.2: Shot(s) on another persons card – 2 points penalty per shot
5.2.3: Extra shots unaccounted for – Lowest 10 shots scored plus 1 point penalty per extra shot
7.3.3: Card shot after the end of the match period – No Score
7.4.2: Not signed by the shooter – No Score
7.4.7.4: Trim line damaged – No score (with cards with a dotted trim line, ALL of the line MUST remain on the card intact)
7.4.7.3: Otherwise damaged or mutilated card including re-stuck stickers – No Score
7.6.3.2: Not witnessed and/or dated or the shooter dated the card – No Score
7.8.3: Cards shot on separate days – Best card only to count, assuming it was shot within the match period. NB CNTSA Rules say each set of two cards must be shot within two hours.
7.10.1.1: Cards not received by the scorer in time – No Score
See here for the full NSRA Rules.