Oldandslow--Ha Ha . I am tied with you. I also have 2 on my wall of shame
Best advice i can give you-If you set up to shoot at 300 yard targets,DON"T
take your first shot at 200 yards
They are pretty much a no brainer to use. Set them up 10 feet away from your muzzel. The shades,,You don't need them unless you are in the sunshine.
JUst check and recheck your bullet path. I found out the things last longer when the bullet goes over the top of the croney ha ha