Well, you answered your own question, in a way. This thread is dedicated to discussing Barred Rocks from Good Shepherd Poultry Ranch, which is one of the finer pure bred lines of Barred Rocks in existence. I'm assuming your got this male from a hatchery or hatchery stock from a feed store? If so, you can see that while he has some nice features, his barring is weak and has gold bleeding through. He is a bit short bodied, just looking at the photo and lacks the depth of a bird bred true to the standard.
As for breeding him to a white leghorn, you will just be making a barnyard mix, so it really doesn't matter what the quality of his barring his. He and the white leghorn will make chicks, if all goes well.