A buddy of mine has a Browning X-bolt long range in 7mag (looks like a hells canyon) that came with a 8 twist barrel factory, We developed a 195eol load for it and got it up to 2950 with N-570, he knows its maxed out and its a hunting rifle, not a weekend practice shooter.
(69gr if I remember correctly), full case for sure and COAL was just enough to fit in the magazine.