Not sure on the heavier bullets, but when I had mine it would push a 85gr Nosler BT just south of 3800 FPS in a 25" gain twist barrel. I used the 90gr X bullet as my hunting load in the low to mid 3700 FPS. Took a WT buck at 418 yards & it did the trick no problem. Loved the rifle, then I discovered this.
That's what happens when you try to friction fit a standard thread into a metric Sako TRG-S receiver.
Be sure you know your gunsmith is up to the task. This guy ain't no gunsmith I discovered. A lesson learned that could have been much worse.
Had intentions of building another one, but got a few other rifles after this episode & never got around to it. Good caliber IMO.