Tap size is 5/16-36, tap drill, 19/64" or letter M.Originally Posted by pdog06
The shoulder isn't the problem using the parent in the improved chamber, its the length from the breach face to the junction of the neck-shoulder junction. The shoulder of the parent is hang'n in the wild blue yonder in an improved chamber, it doesn't make contact at all.
If you want to use the parent use your Improved FL die to size it just enough to push the junction back so it just barely chambers without resistance closing the bolt. If everything is right it will be about .004" difference give or take.
Bill
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