Dean explained to me once, that over time SXS barrels will be different hardness from the out side of the barrel compared to the inner portion of the barrel up against the center rib.
For this reason sometimes if the improper tooling is used the choke will ream out more metal from one side than the other as the reamer wants to cut more from the softer side.
I believe uses a Sunnun machine for his bore and choke work.
It’s been a few years since we discussed this subject so hopefully I have explained this correctly.
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