[tobnpr]

I have the St. Marie mount, but it's the drill and tap, not the clamp-on. Reviews I've read suggest the clamp-on is solid...

You're limited to lower power, LER scopes with the scout mount which may or may not suit you. Depends on whether you want a traditional or LER.

If you do go with the clamp-on mount, keep in mind that just like any offset mount where it is not mounted over the centerline of the bore that your "zero" will be specific for whatever range you set it for. The line of sight through the scope, and the bore are not parallel but divergent. Not a big deal for "groups" on paper, but may be relevant for holding-off at longer ranges if accuracy is critical.