I'm trying to load the 480g Woodleigh Hydro for my 458 Lott. Their manual does not have any info for the 480g. Does anybody have any info that would be helpful? I have contacted Woodleigh and they are good about getting back to you but I'm interested to see if others have worked with this.

Start with the 500gr data.

I agree with P dog shooter, go with the 500 gr. data, maybe start a couple od grs. short and work up to shoot into the same group as your standard load..