338 378 weatherby barrel length

[JamesWilson5]

Already have a 338 378 factory rifle was looking at changing barrel to a hart 30 inch for velocity. I currently have 2 30 378 weatherby one factory one with 30 inch barrel. What kinda velocity should I expect shooting from a 270 grain to a 300 grain bullets. And any opinions on hart barrel

 

[MagnumManiac]

I prefer 32"-34" finished lengths in that size cartridge.
My shortest barrel running my 300-416 Rigby Improved is 30", changed the chamber design in 2022 and very happy with it.
My 338's are running 265's and 300's at above 3300fps and 3150fps respectively, yours may be lower.
I am going to 33XC and 37XC in the near future on these instead of my wildcat, brass will be better in the long run, even though they are not volume shooters by any means.

Cheers.

 

[JamesWilson5]

That's awesome velocity what powder do you use

 

[MagnumManiac]

That's awesome velocity what powder do you use

Was using surplus US869, can't get that anymore, switched to H50BMG and it runs neck and neck with it.
Have used RL33, can't get that either and it runs slower and dirty.

You have far more options than me, Vhit makes 50BMG powder too.

Cheers.

 

[JamesWilson5]

I got lil bit of us 869 thanks for the help

 

[Willys]

The factory 26" runs 300 gr @ 2850 - 2880 with RL33. Go 30" should bump to 2980 which is a good node.
I like the 338 Terminator for Lapua brass getting me 3000 fps with 27" Hart barrel.

 

[HRM Johnny]

Already have a 338 378 factory rifle was looking at changing barrel to a hart 30 inch for velocity. I currently have 2 30 378 weatherby one factory one with 30 inch barrel. What kinda velocity should I expect shooting from a 270 grain to a 300 grain bullets. And any opinions on hart barrel

Thank you for starting this thread.

 

[Gregg C]

Already have a 338 378 factory rifle was looking at changing barrel to a hart 30 inch for velocity. I currently have 2 30 378 weatherby one factory one with 30 inch barrel. What kinda velocity should I expect shooting from a 270 grain to a 300 grain bullets. And any opinions on hart barrel

I ran that big Wby for some time... 31in barrel..
Was a single shot, on a Savage action. Lilja barrel.
Seating the bullets way out there, I pushed the 3000fps range with 300gr Berger OTMs.
I was somewhat underwhelmed when I built a 33XC for that reason. In fact, after 500 rds down the 30in K&P, I pulled it off and had a 34in Lilja installed. Getting around 3150 fps now, which is more to my liking. If I ever rebarrel that rifle, it will get a cut barrel instead.
Don't know how Hart rifles their barrels, but I've always heard good things about them.
Keep us up to date, would you?
Gregg

 

[Gregg C]

I just looked at Hart's website, and their barrels are button pulled.
Food for thought- if you are wanting all you can get from that case, maybe consider a Bartlien.
Gregg

 

[Willys]

i would rebarrel with a 30" chambered in 338 edge.

 

[Gregg C]

Was using surplus US869, can't get that anymore, switched to H50BMG and it runs neck and neck with it.
Have used RL33, can't get that either and it runs slower and dirty.

You have far more options than me, Vhit makes 50BMG powder too.

Cheers.

I've found 24N41 to very very close to H50 BMG, as well. Maybe just a tad quicker.