A freind had a 284 that had been made on an older model Tikka action and had the whole magazine widened. It only everworked a a single shot but he sure used it.
The 284 win has a wider body case and a 308 sized base ( “rebated “).
Could be the T3 has a wide enough a action to run full magnums and WSMs. So people above have found them just fine with 284.
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