Two things that will determine the performance will be the fit & lube used with the bullet.

Bullet fit in the bore to seal itself needs to be 0.002" over bore size but cylinder forcing cones can also play into this if too tight they will reshape the bullt too small to seal the bore! The bullet needs to obdurate (pressure from the powder gases to bump the base of the bullet making it fit better)

Lube which will not hold up to the heat, friction and pressure can lessen potential performance.

I shoot my cast bullets between 1000 fps and 1400 fps using Rooster Labs Red Zambini lube or RCBS rifle lube. Gas Checked bullets almost as fast as jacket bullets.

I cast 0.309", 0.356", 0.358", 0.401", 0.430" and a few various other MZ types.