Don't do it. Use a free trial on a legal platform, visit your local library for DVDs, or wait for the film to hit cable television. The few minutes of "free" entertainment are not worth the lifetime of potential digital scars.
Moreover, piracy hurts the industry. Those 300MB rips are often the reason why good mid-budget films fail at the box office, leading to fewer creative risks and more formulaic sequels.
Stay safe. Stream legally.