Mississippi,
First I heard of Leupold Sako ring mounts breaking. Can you give details of how the ones you wrote about broke? I have a set and would like to know what to watch out for. Thanks.
I'm not Mississippi, but my gunsmith has a pair of damaged Leupold ringmounts for Sako in his "box of horrors".
The user had a ridiculously heavy Euroscope (something like an illuminated 4-12x 56mm Schmidt & Bender) in these rings and the recoil of his .375 H&H combined with the tapered Sako dovetail had simply spread the "legs" of the ringmounts. And no, I don't know why the owner thought he needed a huge heavy scope on such a powerful rifle!
Real Sako rings (and some others, made by Lynx for example) have a hook that engages the rear of receiver so that the ring can't move forward and so this wedging action can't happen.
However, the lack of this hook on the Leupolds means that they offer a LOT more leeway in positioning a given scope on your rifle. This is important, and can mean the difference between getting a scope on a particular rifle with proper eye relief, or not.
With a scope of any normal weight, I would not worry about a Leupold ringmount failing on any Sako in a factory calibre up to the .375 H&H. I have several Sako rifles (and 2 scopes in various mounts for each) -- I use a genuine old Sako ring on my .375 H&H (just for peace of mind because I use a light scope) but I sure don't worry about my Leupold ringmounts on any of my lesser calibres.
Cheers from Sweden,
John