I purchased a 7RM CT Edge with brake last year. Ordered it in March and was assured I would get the rifle in August. Very long, poor customer service related period later I got my rifle TWO DAYS before I left two states away for a hunting trip. I had been repeatedly told I'd get the rifle and thus delayed purchasing a cheapo backup for the trip.
Fierce failed to send me their 'proof target' somehow... I called them to ask what ammo they had tested in the rifle, and they said the 160gr barnes. Not available anywhere in my region. Tried boxes of ammo, and the 175 ABLR trophy ammo ($65 a box!!!) shot the best.
I didn't trust the untested rifle/ammo past 300yds, and wasted a lot of good whitetail meat blasting 7 animals (I hunt for meat only).
Having shot the rifle (620 rounds of load development later) the rifle is the pickiest I've ever seen. It can't shoot an accubond or accubond long range outside of .5". It just won't do it. BUT. I can't get anything else to shoot under .75". By 'anything else' I mean I've tried 175 eldx, 145 lrx, 143gr HH, 160 lrx, 160 NP, 175 NP with RL 23, retumbo, h1000, and h4831. I even rebedded the rifle with no change in accuracy. This is with nightforce bases, bedded rail and leupy vx6 3-18x44.
For yours, I suggest trying significant amounts of jump with your loads. Universally across my testing my rifle did better with more jump. I don't know if this is the way their rifling is cut or not.
Side note- one of the degreasers I used to clean my chamber after break in (brownells cleaner?) Melted the epoxy of the stock clean off. I'm guessing this is because the heavy oil content used in their epoxy paint. I refused to ever send the rifle back to them, so I took it into my smith for a new paint job.
Best of luck! I'll never buy nor endorse a Fierce rifle ever again, having been blatantly lied to multiple times and almost having my hunting season totally ruined.