@Tuidog, if your rifle is shooting well with the externally shouldered barrels, leave them as they are .
When I rebarreled my fox, I trued the front face of the action and set up the shoulder on the front instead of the back and it shoots very well like that.
Technically, the Mauser 98 ( like the cz527)principal of having an internal abutment to tighten the barrel against is very good and helps to get away with a shorter threaded length. The Barnard action has both , an internal abutment and the front face of the action.
Most of the rest of the rifles have a front shoulder abutment.
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