M1 Carbine neck ID?

[gatorwade]

In attempting to handload 30 Carbine for the first time with all new equipment. I ran into some numbers I don't understand. I tumbled once fired cases, decapped, lubed in and out, then ran the cases through a new sizer die. The neck ID came out at .3035". The pilot on the manual case trimmer is .3055". No fit there so I can't trim to length. What did I miss here? I loaded a bunch of 40 S&W on borrowed equipment a while back with no such problems.

Information

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[Al Diehl]

The sizer die in a 3 die set usually makes the neck slightly undersize which is then opened up in the expander die to the final size prior to bullet seating. I would set the expander die so that it is just short of creating the "flare" and run my cases through it. Then they should fit on the trimmer pilot.

Al

[gatorwade]

Thanks for the explanation on use of the expander die. Now understand it is used for 2 functions in the loading process for 30 Carbine. Anyway, got a batch of brass trimmed just right and moving on to the next step. Really appreciate the gentle sharing of knowledge that makes this forum so good.