There is no standard setting on an iron that corresponds to 300 degrees Fahrenheit. Irons typically use a combination of heat settings and steam settings, and the exact temperature achieved will vary between models.

To get a precise temperature, you would need an iron with a digital display that shows the actual temperature.

However, 300 degrees Fahrenheit is a very high temperature for ironing most fabrics. This temperature is more likely to scorch or melt fabric.

Here's a general guide to iron settings based on fabric type:

* Low (200-250 degrees): Delicate fabrics like silk, rayon, and acetate.

* Medium (300-350 degrees): Wool, linen, cotton, and synthetics.

* High (400-450 degrees): Heavy fabrics like denim and canvas.

It's always best to refer to the care label on your garment for the recommended ironing temperature.