Apache's 450 Bush Master

I already have one of his 450 BM's in varmint contour, about 18.5 inches... really like it.

Now I am thinking about getting a slightly lighter weight contour. I know it can't be too light due to the large hole running through it, but what would be the lightest contour y'all might recommend?

I'd ask your barrel maker.

I did. :)
Just wondering what you guys think.

My Apache built 450 BM is threaded 5/8-24 and works great. I am betting a muzzle diameter of .670" would be a bare minimum but I would feel better with .700" or more if it were me.

Thanks, Boots.