I have some very high quality 270 WSM brass from another project. I would like use this brass for my 300 WSM. Anyone necked tried this and care to share any challenges that emerged?
270 wsm brass necked up 300 wsm?
- Thread starter grouse
- Start date
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Elk Hunter 338
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easy peasy run lube the neck, run it through 300 wsm die with mandrel on it boom done!!
aushunter1
Well-Known Member
Imo its better to use a sizing mandrel for upsizing, much better for the neck that the FL sizing expander.
However your still most likely going to have to FL size after that as it will most likely affect the neck/shoulder contact point after you seat your projectile.
I sized up Norma .243 brass to .264 & chambered an empty case after expanding only & it was fine.
Then after I seated the projectile they would not chamber.
Obviously having freshly annealed brass will help in this process.
However your still most likely going to have to FL size after that as it will most likely affect the neck/shoulder contact point after you seat your projectile.
I sized up Norma .243 brass to .264 & chambered an empty case after expanding only & it was fine.
Then after I seated the projectile they would not chamber.
Obviously having freshly annealed brass will help in this process.
