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Cat_Whisperer
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Re: Sizing Die for 38-55
Jun 24th, 2017 at 7:28am
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ao3 wrote on Jun 24th, 2017 at 6:45am:
What size die (expander)  do i need for .377 bullet, it is for a 38-55   Thanks  AO 3


There are several ways of doing it.  I like to open it up so there is about .002" of 'tension' on the bullet, i.e. to open it up to .379".

There is some spring-back of the brass.  This varies a little with the condition of the brass - just annealed or well used and work hardened.

One method is to use the standard expander and then to 'bell' the mouth so the edge doesn't shave the bullet.

I make (you can too) an expander that for the greatest depth expands so there is .002" tension; the 1/10" at the top of the case gets opened up so there is .001 - .002" clearance; and there is a slight bell opened up by a taper on the expander; and there is a shoulder on the expander to stop the expander from going deeper.

You can put an oversized expander into a drill, drill press, or lathe and use a file.

  
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SSShooter
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Re: Sizing Die for 38-55
Reply #1 - Jun 24th, 2017 at 12:14pm
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Once fire-formed, I never size again. I use a Lee powder die with a 0.378" insert to insure the mouth is round and then thumb-seat the bullet. Then add tension by using a bushing type neck-sizing die to insure a consistent tension. Easy to change the bush if you want less or more tension
  
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Leo1885
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Re: Sizing Die for 38-55
Reply #2 - Jun 24th, 2017 at 12:40pm
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I have an RCBS Cowboy set that includes .375" and .377" diameter expander plugs. I use the .377 so that I can finger seat the bullets.
  
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