I'm playing a 10th lvl cleric. I attempted to cast an 8th lvl Power Word Stun spell from a scroll that the DM gave me. When I attempted to cast it the DM said it does not automatically succeed because I can only cast 5th level cleric spells. I don't see anything in the DMG or PH that suggests scroll spells are less successful when cast by lower level spell casters. The DM gave me a 30% chance of success and he gave me 3 tries (one attempt per round). Is this pretty common practice among the DM's out there??
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It doesn't automatically succeed but the way your DM handled it was also incorrect with regards to the rules.
From the Spell Scroll's description on page 200 of the DMG: