If you can, opt for 1–2GB 720p/1080p encodes — far better experience. 300MB rips are a last resort.
Here’s a quick review of what to expect from in general: new movies 300mb
If you meant a specific movie titled something like “300MB” or had a different film in mind, please clarify and I’ll give a proper review. If you can, opt for 1–2GB 720p/1080p encodes