Rifle builders HATE mini chassis. It costs them $400 for a bedding job. You buy a chassis when you don't want to bed.
Not sure what you're chasing but, you will have a chore trying to get under half inch groups. The accuracy you state, IF true, is fine for anything. If you want better accuracy, take the Proof off, install a truck axle steel barrel and bed it, you will then have an F-Class rifle.