Avoid the small rifle murom, they can be soft KVB7 LR are excellent though, I'd have no issue using these, no experience on the S&B but have heard good things.
I would switch as this is a taste of things to come for US manufactured stuff, speaking to when of the head guys at Grafs about .280 brass they are looking at 2 years before some stuff gets in stock and when anything lands it sells almost instantly.
Stick to European kit and hope the yanks don't cotton on to it.
PS if changing primer work up your loads again