I have owned in the past a T/C Custom shop 284Win 15" bbl.
It was accurate with sub-MOA accuracy at 100 yards.
I never had an issue with extraction, which kinda surprised me with that rebated rim case. However, I never had an issue.
Performance wise, I had a 280 AI barrel (actually two) in the Encore platform that outperformed the 284Win barrel by a decent amount. I would still prefer the 280AI over the 284Win in the Encore.
As mentioned, the XP-100 is easier to shoot accurately than the Encore, and is my preferred platform for specialty pistols over the Encore. Trigger is better too, on the XP-100.
However, in the XP-100, I much prefer the 7mm RSAUM over the 284 Win.