I rechambered a t3 tikka 7mm-08 to 280 rem after seeing another done on here
It's no problem to do and set back the barrel at the same time so the previous cal stamp is under the stock
Some gunsmiths simply won't do it because it's hard on the reamer but I had my own ordered in so there was no drama
In addition to that you need to replace the boltstop if it's the skeletonised type or modify it if it's the solid type, and a new magizine to suit the 284 and you are away
Mitch maxberry done mine and I'm really pleased with the outcome
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