A lot of rifles do, primarily because most of today's slower powders burn more consistently at 62,000+ psi, since that's what they were designed for.
The Ramshot rifle powders are particularly prone to this. I've seen a lot of posts where somebody gave up on a Ramshot powder because the starting load didn't shoot very well. If they'd kept on adding powder the groups would have shrunk, unless there was something wrong with the rifle or scope. I know this because I've seen it hundreds of times.
