338 federal twist rate?

[hithard]

putting new barrel on, 338 federal, 20 inch tube, thinking that 1-10 is the way to go for both j and cast, but possibly 1-12 might be better for the cast and the j's will just have to stay on the 180 to 200gr. side and not the 250 and up.

What your experience say?

[DCM]

Confusion say check this out. http://castboolits.gunloads.com/showthread.php?t=107867&highlight=twist+rate Be careful with your numbers in the Greenhil formula, the constants are different for different types of bullets.

[Good Cheer]

Questioning the twists for .338 diameter boolits...

Anyone have data to contribute to a discussion?
Not just .338 Federal but other cartridge case designs also?
I'm looking at maybe going with a .338 on an expanded volume .303 case base. A little hesitant about one turn in 10" as opposed to a slower twist. Then again, lighter boolits at slower speeds... hmm, maybe so, maybe so.

[Doughty]

Good Cheer, I shoot a .30-40 Krag blown out to .338 with 225 grain cast bullets at 2400 fps in a 12 twist Lilja barrel. Shoots good. I also shoot 240 grain cast bullets at 1400 fps. Also shoots very good.

[stubshaft]

I have a 338/06 and a 338/280 C (think 338/06 -06 Acley improved with the shoulder moved forward .060:") Both of them have 1 in 10" twists and shoot Lee and Lyman 225 gr boolits at 2550fps with great accuracy and no leading (hardball alloy with LBT Blue).

[Good Cheer]

Thanks for the input fellas.

[pietro]

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AFAIK, the 1 in 10" twist will handle all boolits in the .338 federal.

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