Did you break in the barrel using the Fierce technique? They highly recommend doing so--its on the website in FAQ section. Also try using the ammo they shot your proof target with if it meets your purposes. They guarantee 1/2 MOA with factory ammo or they'll work you up a load that will shot 1/2 MOA and give you the recipe. They proofed my 7mm-08 CT Carbon Edge using 125 gr Nosler BT...So I was like...great, but, why'd you do that?...nobody shoots 125 gr Nos BT in the field on deer/Elk...it was a .3 MOA group but just not what I use.
So I cheated and bought about five different factory loads all around 140 gr and 150 gr Hornady precision. They all shot good(ish) but no house afire. The Hndy Precision was a real disappointment--I heard so much about it and was hoping to be lazy and just get a bunch of factory 150
and be done with it. So I went to work reloading and discovered it was very finicky to bullet type. The good news is I developed a very satisfactory load using 145 gr. Barnes LRX that gives me 2844 in the 22' carbon fiber barrel and is a deadly load on game--shoots about a .40 cal., 5 shot group at 100 yds. Best thing is 6.25 Lbs with optics...I do love that rig, very "handy".
So you might try the break-in, the ammo they used for your proof, then some other brand/weight of factory ammo, then try working up a load before punting to the factory. They will indeed work you up a load but might take a while. They are good dudes but now that they are busy and famous they've gotten very sloooow--my 6 month wait for the custom build rifle turned into 14 months as they really had trouble getting the 22" in barrel blanks out of Canada, coupled with about 10,000 rifle orders drop all at once after the second/third? shot show--I don't think they saw that comin'. I bought two other CT Carbon Edge off the shelf in 6.5 CM for my son and business partner (both of those BTW, shoot anything you chamber, lights out) and talked a lot with John and Devin during the build...despite that engagement after a while it was like "'scuse me who are you?...and what are we doing for you? Oh yeah you're that guy--evidently an individual buying 15K worth of rifles does not impress the Fierce crew