Re: 338 edge resizing question
I have done a little research on this, let me know if I am off the mark!
To start with. The 300 RUM is 2.382" from base to start of shoulder. The .338 RUM is 2.290" from base to start of shoulder. They both have the same shoulder angle.
Used a neck expander to expand new 300 RUM brass out so that a .338 cal projectiles will just slip into the neck with your fingers.
Place a new 300 RUM case into the shell holder and gently screw down the .338 RUM full length sizing die until it contacts the shoulder of the case. At this point the 338 RUM die should have a 0.092" gap between the shell holder and the base of the die. Lock the die in place.
This means that the bottom 0.092" of case will never get resized.
Remove 300 RUM case and replace it with one that hase been neck expanded. Lower the full length sizer die down fully to align the neck and resize it to correct diameter.
Try an EMPTY case in your rifle to see if it fits. If OK then load and enjoy.
Once you have fired a case in your rifle, measure it up and make ajustments to the die height above shell holder as required.
This method may or may not make the most accurate ammo, but it should go bang.
Hey guys found this post from back in dec. 08 guess i should have looked before posting my question sorry.