Originally Posted by JamesWilson5
Just loaded some 165 grain accubond in a 30 378 wby with a 30 Inch tube 122.0 grain of us869 shoots under half inch has anyone chrono or tried it on deer just curious how fast and effective they are

You'll be in the 3,350 - 3,400 fps range

See Nosler data for H-50BMG:

https://www.nosler.com/30-378-weatherby-magnum

This data shows 3,250 fps and add another 100 fps for your 30" bbl.

I've used US869 quite a bit in my .264 Win Mag. It's slower than H-50BMG and RL-50, but is definitely more accurate.

That's said, I'd be running a mono-metal bullet at those speeds.