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Old 07-13-2017, 02:52 AM
GrocMax GrocMax is offline
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Join Date: Oct 2012
Location: McKinney TX
Posts: 488
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The Forster BR and Ultra seater dies you have to change 2 parts whether you are in the same case family or not, any neck diameter change means changing the seater stem, and chamber. the chambers are caliber specific and tight clearance, 223 AI will not fit a 223 seater chamber. These do hold full, tight case body/neck to seater chamber alignment, but the very thin walled seater stems (neck OD to allow full chamber and neck support) can be problematic and spread, locking in the chamber and making adjustments difficult when high seating force is used. Proved to be very inconsistent for me, with distorted ogives on 20's when at more than about .001" 'press fit'. Love the 6BR version.

My fave for 20's has become the cheap Hornady New Dimension 20 cal universal seater. It can even be used on real short cases (NorCalMikie ). no bullet deformation, easy seating.

Last edited by GrocMax; 07-13-2017 at 02:56 AM.
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