mould possibly out of round

Boolit Master Join DateJan 2012Posts153

How common is it for a mould to be slightly out of round? I ask because I used my Lyman mould for the first time to make .45 SWC's. I pushed them through the sizer and they were pretty close to size already but parts of the boolit circumference are getting sized (looking shiny), and parts are not contacting the inside of the sizer. I've noticed this also with Lee boolits. How much of a concern is this with accuracy if they are slightly out of round?

Perhaps you should measure the boolits as dropped from the mould. Sometimes the sizer can be out of alignment and cause this symptom.

But, yes, of all the moulds I own, none of them cast a perfectly round boolit. I can accept an "as cast" boolit that is .001" to .003" out of round.

You cannot discover new oceans unless you have the courage to lose sight of the shore

Rare to get a perfect boolit from any mold but .454 is right about most sizers. I went to Lee push through to get better results.
Heat on the mold will expand the center of the cavity half out and also the edges out so they will be larger at the parting line.
Until I figure how to make a cherry to cut an oblong hole, I live with it.
I have found I can make the mold hot and re-cut by hand with the cherry to get a rounder boolit.

but I think james and myself are the only two here that believe that..

it's rare to find a mold within more than .001 roundness.
it is easier to get a near round hole in a sizer die, but the barrel will quite often mess it all up again.

it's all an educated guess,,,, till the trigger is pulled.

the more i find out about shootin boolits, the more it contradicts everything i ever learned about shooting jaxketed.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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