Choice of expander plug

Up

0

Down

::

I just finished measuring the chamber cast of my Rem 700 in 308W. I am using a NOE mold that drops 0.310.  The the barrel is 308/303.  Do I size for 308 or 309?  How do you pick the expander plug size.  It should be simple but I have never done any cast for rifles.

Ed C

Topic

[Ranch Dog]

Up

0

Down

::

I would size the bullet .0015 to .0020 over groove. In other words, at .310″. I would think you need the 30REXP Plug.

[bobdavisParticipant]

Up

0

Down

::

I would size the bullet .0015 to .0020 over groove. In other words, at .310″. I would think you need the 30REXP Plug.

Yes Sir good advice start with a .310 mold then size from there,you might find a.309 works better in your rifle,keep a eye on your OAL I like to load out to the leading if I can.

[paulwynn]

Up

0

Down

::

Ranch Dog,
So you recommend 0.003 under for tension? (0.310 cast size – 0.307 expander size)? The 0.001 mouth flare/bell is then recommended for ease of seating the bullet?

Sorry for NOOB questions, I am just getting ready to cast for my Mosin M91/30. (.312 groove / .301 land) My buddies is .313/.303. I have signed up for the Ed Harris bullet group buy in a 0.314 diameter.

[Ranch Dog]

Up

0

Down

::

Ranch Dog,
So you recommend 0.003 under for tension? (0.310 cast size – 0.307 expander size)? The 0.001 mouth flare/bell is then recommended for ease of seating the bullet?

I’m just using the .003″ under and then chamfering the case mouth. All my rifle shooting is with gas checked bullets. Without the check and with a flat base bullet the .003″ is going to need to be reduced to .001″ ~ .002″. I do not flare or bell the case mouth any further.

[Author]

Replies