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With the Jes rebores has anyone done a chamber cast?
I have cast three Winchesters and all have a rather gental entrance from the throat to the rifling.
The other big bore Winchesters are rather abrupt going from a short ball seat to the origin of the rifling.
The Lee 250 grain cast bullet unsized fills the throat and shoots well from my rifle. Kills our small deer well.
 

.375 Winchester chamber cast



 

Bullet factory



Meplat for Sierra and Bullet Factory



Lee 250gr