Problem With Lee 356 sizer die

[metho]

I have been successfully casting 45 boolits for a few weeks now and have moved onto 9mm. I slugged my barrel and found that it is .355". I bought the lee 6 cavity 124gr truncated cone mold and a lee 356 sizer kit. I cast some boolits, loaded them up and shot them. The accuracy was fine and they cycled just fine except I got quite a bit of leading. When I got home I measured the diameter of a few of the boolits and found that they were all .354, I checked with 2 different calipers so I know they were right.is it normal for lee sizer dies to under size a boolit? My 45s I cast and size at 452 and they come out as 452.

Is the under sized boolit causing the leading or could it be the load data? I'm casting with 50/50 ww/pure lead and loading with 4.5gr unique @ 1.110 oal.

[Love Life]

Yes it is normal for Lee sizer dies to under size. Every die I have ordered from them has been
.001 under advertised diameter. I just open them up with some sand paper and a wooden dowel.

[Thompsoncustom]

Yup that's normal for a lee sizer. The sand paper and wooden dowel is the way to go look at it this way you can now have your boolits sized to whatever diameter to pick.

[500MAG]

Did you check the size of the boolit before sizing?

[williamwaco]

I wouldn't say they are always under but they are inconsistent.

Here are mine.

http://www.reloadingtips.com/reviews/lee_bullet_sizer.htm

[chevyiron420]

That boolit alloy may be to soft for the 9 especially if the boolits are green.

[Raven_Darkcloud]

They could be getting swagged down during seating and crimp.

[BoolitSchuuter]

They could be getting swagged down during seating and crimp.

+2. seat one then pull it and check diameter again.