I believe what you he is saying the widest part of the gun, is the narrowist part of the slug you pushed through, which is made by the grooves of the barrel.Thanks glock ill be measuring the widest parts
You do not need to buy a bigger expander plug. Just adjust yours as usual to bell the case just big enough to accept the bullet.Is there a link to docs bullets?
One last questoon is can I just buy a bigger expander plug for my regular rcbs dies.
I would hate to buy a full set of dies if I already have some.