Re: 300 wm loads
I've been wondering the same thing Woolf... must have a ton of freebore and a really stout action.
In Nosler/Federal brass I run 76.2 gr of H1000 over CCI 250's behind 208's, .005" off the lands (about 3.665" COAL). When it's over 90 deg. F, I get *occasional* harder than normal bolt lift, so I'm probably close to the limit. This is in a Tikka action, 22" hand-lapped 1:10 tube. I get 2860 fps and have used this load effectively to 1900 yds.
I get similar velocities from 77.2 gr in Winchester brass, but have yet to find a combo that shoots as accurate as the Nosler/Federal.
John