Vance,
I have and use both scopes, and, at one time or the other, they both have been on a 480 Ruger which is a pretty hard hitter. Both have held up fine. I prefer a lower power scope on large bore hunting rigs, so, between the two, I would perfer the Simmons due to its lower end. Another consideration to think about though, I don't know if Simmons will repair the Gold Medal if it should fail since it is no longer in production. The Weaver carries a lifetime limited warranty. I believe fixed power scopes hold up better on heavy calibers since there are less internal parts to fail unless you get into the higher-end scopes such as the Burris' and the like. Just my opinion for what it is worth...BG