I have heard the Tiika/Sako barrels dont take well to improving sometimes due to a hard surface but removeing the whole chamber by going to the 284 case should sort that tho I havent actually talked to a smith yet.
Also I already have the 30-284 so common brass and dies and even with a 140 stuffed in it the 6.5-284 should still have well more capacity than 260ai.
On my list of round tuit jobs was to make a new mag box to suit the 284 shoulder and this would not work with the 260.
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