This sounds like a very good way to.bed a t3 I would be trying this if I were to do another one. I have used the stuff from terminal ballistics and was happy enough with it to use it again . If you take the stock off you will notice the t3s actually have pressure pads about a third of the way down the barrel channel. I remove these (just a slip of a sharp chisel) and open the barrel channel if necessary before load development
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