Sizing Die size???

[Slamfire]

 I have a Lyman 457121 mould it drops .457-..459 (20-1 mix) or 11-13 BHN +-. I am now PC'n my cast bullets for all "weapons" ( Drill Sgt. stuff). I am loading these for my (UGLY) 45-70 #5 RB, i am making a new resizing die, should i make it .456 or .457 and PC, or PC as cast then resize to .458, opinions please.

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[Coffinmaker]

Ah well,

Without knowing the actual bore dimensions, any suggestion would be meaningless.  Your projectiles should finish out at a Half thou or full thou over bore diameter.  Slug the bore before going forward making a new die.

[Slamfire]

 Sorry i should have posted the bore, i sluged the bore it mic'd at .4572.

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[Coffinmaker]

  Slammer 

Um OK, sorta my bad.  But and however, if the raw bullet drops from the mold at 457 - 459, the new sizing die should be 458 (based on your bore) and the under size bullets go back inna pot as the undersize bullets won't actually "size up" 

[Hair Trigger Jim]

The able woodcrafter didn't specifically mention it, but in your direction, I would think you'd powder coat before sizing.  That may also help with some of the undersize bullets.

[Dave T]

Powder coat! Good grief, ya mean we aren't talkin' about loading black powder? Had I only known...

Dave

[Slamfire]

 Dave T, (laughing), i are a heather'n shooter. Hair Trigger, i did (do) powder coat 1st, then size to .458, i just made me a .458 sizer for my Lyman 450 w/o lube holes it's strickle for PC'd and they all miced .458. This is my first go at 45-70's. I am now making a neck expander & neck sizer combination to use in an old LEE die i  have setup for this purpose.

  coffee time,  Hootmix.